API reference

request

curl -X POST https://basinwise.vercel.app/api/v1/determine \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: determine-demo-1" \
  -d '{"state":"MA","activity":"construction","disturbedAcres":6.5,"partOfLargerPlan":false}'

response 200

{
  "data": {
    "coverage": "required",
    "coverageReason": "The project disturbs 6.5 acres, at or above the 1 acre threshold, so it needs permit coverage.",
    "permit": {
      "id": "federal-cgp",
      "name": "2022 Construction General Permit",
      "permitNumber": null,
      "version": "2022 CGP (as modified 2025)",
      "authority": "U.S. Environmental Protection Agency",
      "agencyName": "U.S. Environmental Protection Agency",
      "agencyUrl": "https://www.epa.gov/npdes/stormwater-discharges-construction-activities",
      "permitUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
      "effectiveDate": "2022-02-17",
      "expiryDate": "2027-02-16",
      "confidence": "verified"
    },
    "jurisdiction": {
      "code": "MA",
      "name": "Massachusetts",
      "npdesAuthorized": false,
      "agencyName": "U.S. Environmental Protection Agency (EPA Region 1)",
      "agencyUrl": "https://www.epa.gov/npdes/2022-construction-general-permit-cgp",
      "credential": {
        "required": null,
        "name": "Registered professional engineer",
        "sourceUrl": "https://www.mass.gov/doc/stormwater-report-checklist/download",
        "confidence": "unverified"
      },
      "confidence": "verified",
      "note": "EPA is the permitting authority. Coverage is under EPA's 2022 CGP, permit area MAR100000. MassDEP administers separate state wetlands and water quality requirements that were not verified here; confirm state and municipal requirements alongside the federal permit. The 2022 CGP as modified became effective April 8, 2025 and expires February 16, 2027; confirm the successor permit near that date. Credential: the 2022 CGP imposes no SWPPP preparer credential. It does require inspections by a 'qualified person' (Part 4.1), which is an inspection credential, not a preparation credential."
    },
    "eligibilityScreens": [
      {
        "id": "esa",
        "label": "Endangered species screening",
        "status": "action_required",
        "detail": "You must document that you meet one of the endangered species protection criteria before coverage begins. This is a screening you complete, not one we can complete for you.",
        "citation": {
          "sourceCitation": "Part 1.1.5 (criteria labels corroborated at Part 9.2.1, Seneca Nation)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You can demonstrate you meet one of the criteria in the Endangered Species Protection section of the Notice of Intent (NOI) that you submit for coverage under this permit, per Part 1.4, with respect to the protection of Federally listed",
          "confidence": "verified"
        }
      },
      {
        "id": "historic",
        "label": "Historic properties screening",
        "status": "action_required",
        "detail": "You must complete the historic properties screening process and keep the documentation with your plan.",
        "citation": {
          "sourceCitation": "Part 1.1.6 (documentation duty at Part 7.2.9b)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You have completed the screening process in Appendix E relating to the protection of historic properties; and",
          "confidence": "verified"
        }
      },
      {
        "id": "receiving-water",
        "label": "Receiving water sensitivity",
        "status": "unknown",
        "detail": "You have not confirmed whether the site discharges to a sediment or nutrient impaired water or a Tier 2, 2.5 or 3 water. This changes your inspection frequency, so confirm it before relying on the answer above.",
        "citation": {
          "sourceCitation": "Part 3.2",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "For any portion of the site that discharges to a sediment or nutrient-impaired water or to a water that is identified by your State, Tribe, or EPA as Tier 2, Tier 2.5, or Tier 3 for antidegradation purposes, 57 you must comply with the",
          "confidence": "verified"
        }
      },
      {
        "id": "prohibited",
        "label": "Prohibited discharges",
        "status": "action_required",
        "detail": "Certain discharges are prohibited outright, including concrete washout wastewater unless managed by an approved control. Review the prohibited discharge list against your site activities.",
        "citation": {
          "sourceCitation": "Parts 1.3.1 - 1.3.5",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Wastewater from washout of concrete, unless managed by an appropriate control as described in Part 2.3.4; 1.3.2 Wastewater from washout and/or cleanout of stucco, paint, form release oils, curing compounds, and other construction",
          "confidence": "verified"
        }
      }
    ],
    "requirements": [
      {
        "id": "inspection.frequency.option1",
        "kind": "inspection",
        "label": "Inspection frequency, option 1",
        "detail": "At least once every seven (7) calendar days",
        "value": 7,
        "citation": {
          "sourceCitation": "Part 4.2.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "At least once every seven (7) calendar days; or",
          "confidence": "verified"
        },
        "because": "You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes."
      },
      {
        "id": "inspection.frequency.option2",
        "kind": "inspection",
        "label": "Inspection frequency, option 2",
        "detail": "Once every 14 calendar days AND within 24 hours of a storm event producing 0.25 inches or more of rain in a 24-hour period, or of a discharge caused by snowmelt from a storm event producing 3.25 inches or more of snow in a 24-hour period.",
        "value": 14,
        "citation": {
          "sourceCitation": "Part 4.2.2 (with Parts 4.2.2a and 4.2.2b)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Once every 14 calendar days and within 24 hours 67 of the occurrence of: A storm event that produces 0.25 inches or more of rain within a 24-hour period. If a storm event produces 0.25 inches or more of rain within a 24-hour period",
          "confidence": "verified"
        },
        "because": "You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes."
      },
      {
        "id": "inspection.report.deadline",
        "kind": "recordkeeping",
        "label": "Inspection report deadline",
        "detail": "Complete the inspection report within 24 hours of completing the site inspection.",
        "value": 24,
        "citation": {
          "sourceCitation": "Part 4.7.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must complete an inspection report within 24 hours of completing any site inspection.",
          "confidence": "verified"
        }
      },
      {
        "id": "inspection.qualifiedPerson",
        "kind": "inspection",
        "label": "Who may inspect",
        "detail": "The person inspecting the site may be a member of your staff or a third party you hire. You are responsible for ensuring that any person conducting inspections is a \"qualified person\", meaning someone who has completed the training required by Part 6.3.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 4.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You are responsible for ensuring that any person conducting inspections pursuant to this Part is a “qualified person.” A qualified person is someone who has completed the training required by Part 6.3.",
          "confidence": "verified"
        },
        "because": "This is why Basinwise cannot perform your inspections. The permit requires a trained person physically on the site."
      },
      {
        "id": "stabilization.initiate",
        "kind": "stabilization",
        "label": "Initiate stabilisation",
        "detail": "\"Immediately\" means as soon as practicable, but no later than the end of the next business day, following the day when the construction activities have temporarily or permanently ceased.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 2.2.14a, Table 2 (definition at footnote 39)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "In the context of this provision, “immediately” means as soon as practicable, but no later than the end of the next business day, following the day when the construction activities have temporarily or permanently ceased.",
          "confidence": "verified"
        },
        "because": "This applies at both land disturbance amounts."
      },
      {
        "id": "stabilization.complete",
        "kind": "stabilization",
        "label": "Complete stabilisation",
        "detail": "Complete the installation of stabilization measures as soon as practicable, but no later than seven (7) calendar days after stabilization has been initiated.",
        "value": 7,
        "citation": {
          "sourceCitation": "Part 2.2.14a, Table 2 row ii",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Complete the installation of stabilization measures as soon as practicable, but no later than seven (7) calendar days after stabilization has been initiated.",
          "confidence": "verified"
        },
        "because": "You have not told us how much land will be open at any one time, so we have assumed the whole 6.5 acres are, which takes the 7 day deadline. The permit measures this on land disturbed at any one time, not the project total: if you phase the work so no more than five acres are open at once, stabilising finished ground before opening more, the deadline is 14 days instead. Tell us your concurrent acreage to get the answer that applies to your site."
      },
      {
        "id": "filing.swpppBeforeNoi",
        "kind": "filing",
        "label": "Plan before Notice of Intent",
        "detail": "Develop the plan before submitting your Notice of Intent for coverage.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 1.4.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must develop a SWPPP consistent with Part 7 before submitting your NOI for coverage under this permit.",
          "confidence": "verified"
        }
      },
      {
        "id": "filing.noi",
        "kind": "filing",
        "label": "Notice of Intent deadline",
        "detail": "At least 14 calendar days before commencing construction activities",
        "value": 14,
        "citation": {
          "sourceCitation": "Part 1.4 (deadline value from Part 1.4.3, Table 1)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "must submit to EPA a complete and accurate NOI in accordance with the deadlines in Table 1 prior to commencement of construction activities",
          "confidence": "verified"
        },
        "because": "This is the deadline for a new site. A transfer to a new operator or an emergency related project has a different deadline."
      },
      {
        "id": "filing.not",
        "kind": "filing",
        "label": "Notice of Termination deadline",
        "detail": "Submit the Notice of Termination within 30 calendar days of meeting a termination condition.",
        "value": 30,
        "citation": {
          "sourceCitation": "Part 8.4",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must submit an NOT within 30 calendar days after any one of the conditions in Part 8.2 occurs.",
          "confidence": "verified"
        }
      },
      {
        "id": "corrective.minor",
        "kind": "corrective_action",
        "label": "Corrective action, minor fix",
        "detail": "By the close of the next business day after discovering the condition.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 5.2.1b",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "When the problem does not require a new or replacement control or significant repair, the corrective action must be completed by the close of the next business day; or",
          "confidence": "verified"
        }
      },
      {
        "id": "corrective.major",
        "kind": "corrective_action",
        "label": "Corrective action, major fix",
        "detail": "Within 7 calendar days of discovery.",
        "value": 7,
        "citation": {
          "sourceCitation": "Part 5.2.1c",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "When the problem requires a new or replacement control or significant repair, install the new or modified control and make it operational, or complete the repair, by no later than seven (7) calendar days from the time of discovery.",
          "confidence": "verified"
        }
      },
      {
        "id": "corrective.documentation",
        "kind": "recordkeeping",
        "label": "Corrective action log entries",
        "detail": "Record the condition within 24 hours of identifying it, and record completion within 24 hours of completing the work.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 5.4.1a",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Within 24 hours of identifying the corrective action condition, document the specific condition and the date and time it was identified.",
          "confidence": "verified"
        }
      },
      {
        "id": "retention.inspection",
        "kind": "recordkeeping",
        "label": "Record retention",
        "detail": "Retain inspection reports and the corrective action log for at least 3 years from the date permit coverage expires or is terminated.",
        "value": 3,
        "citation": {
          "sourceCitation": "Part 4.7.4",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must retain all inspection reports completed for this Part for at least three (3) years from the date that your permit coverage expires or is terminated.",
          "confidence": "verified"
        },
        "because": "The clock runs from permit expiry or termination, not from when the record was written, so on a multi year project every record stays live for the whole project plus three years."
      },
      {
        "id": "buffer.trigger",
        "kind": "buffer",
        "label": "Natural buffer",
        "detail": "Provide and maintain a natural buffer or equivalent erosion and sediment controls where a surface water lies within 50 feet of the disturbance.",
        "value": 50,
        "citation": {
          "sourceCitation": "Part 2.2.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Provide and maintain natural buffers and/or equivalent erosion and sediment controls for discharges to any receiving waters that is located within 50 feet of the site’s earth disturbances.",
          "confidence": "verified"
        }
      }
    ],
    "derivation": [
      {
        "step": "Coverage threshold",
        "result": "The project disturbs 6.5 acres, at or above the 1 acre threshold, so it needs permit coverage.",
        "citation": {
          "sourceCitation": "Part 1.1.2",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Will disturb one or more acres of land, or will disturb less than one acre of land but are part of a common plan of development or sale (as defined in Appendix A) that will ultimately disturb one or more acres of land",
          "confidence": "verified"
        }
      },
      {
        "step": "Permitting authority",
        "result": "EPA. MA is not an NPDES authorized state, so EPA's Construction General Permit governs directly."
      },
      {
        "step": "Preparer credential",
        "result": "Massachusetts gates plan preparation conditionally. The gate is triggered by plan scope rather than acreage: Attaches to the Wetlands Protection Act pathway. Confirm which case applies to your plan before relying on a generated document.",
        "citation": {
          "sourceCitation": "MassDEP Stormwater Report Checklist",
          "sourceUrl": "https://www.mass.gov/doc/stormwater-report-checklist/download",
          "confidence": "unverified"
        }
      }
    ],
    "notices": [
      "Massachusetts gates plan preparation conditionally. The gate is triggered by plan scope rather than acreage: Attaches to the Wetlands Protection Act pathway. Confirm which case applies to your plan before relying on a generated document.",
      "Basinwise does not perform the physical site inspections the permit requires. Those must be carried out on site by a qualified person.",
      "The source extraction contains the permit body (Parts 1-9) only. Appendices A (Definitions), B (Eligible Permit Areas), C (Small Construction Waivers), D (ESA Eligibility Procedures), E (Historic Property Screening), F (Buffer Requirements), G (Standard Permit Conditions), H (NOI Form), I (NOT Form), J (Chemical Treatment Request) and K (Turbidity Report Form) were NOT present in the extracted text. Every fact whose operative text lives only in an appendix is marked confidence \"unverified\" with a note naming the appendix to confirm."
    ],
    "confidence": "verified",
    "datasetVersion": "2026-07-19",
    "input": {
      "state": "MA",
      "activity": "construction",
      "disturbedAcres": 6.5,
      "maxDisturbedAcresAtOneTime": null,
      "partOfLargerPlan": false,
      "sectorCode": null,
      "startDate": null,
      "endDate": null,
      "onTribalLand": false,
      "federalFacility": false,
      "dischargesToImpairedWater": null,
      "dischargesToTier2Water": null,
      "aridClimate": false
    }
  },
  "request_id": "req_2f9c41a7b0e84d15",
  "disclaimer": "Basinwise reports publicly published permit requirements and cites the permit section behind each one. It is not legal or engineering advice and it is not a permit. We do not perform the physical site inspections the permit requires; we generate the plan and keep the record. Where a jurisdiction requires a credentialed preparer, the document we generate is a draft for that person to review and sign. Always confirm against your permitting authority's current permit before you break ground.",
  "attribution": "Data from Basinwise (https://basinwise.vercel.app): NPDES stormwater permit requirements, cited to the permit section and carrying a confidence flag. Free responses require this attribution."
}

request

curl "https://basinwise.vercel.app/api/v1/requirements?state=MA&activity=construction&acres=6.5"

response 200

{
  "data": {
    "site": {
      "state": "MA",
      "activity": "construction",
      "disturbedAcres": 6.5,
      "maxDisturbedAcresAtOneTime": null,
      "partOfLargerPlan": false,
      "sectorCode": null,
      "startDate": null,
      "endDate": null,
      "onTribalLand": false,
      "federalFacility": false,
      "dischargesToImpairedWater": null,
      "dischargesToTier2Water": null,
      "aridClimate": false
    },
    "coverage": "required",
    "coverageReason": "The project disturbs 6.5 acres, at or above the 1 acre threshold, so it needs permit coverage.",
    "permit": {
      "id": "federal-cgp",
      "name": "2022 Construction General Permit",
      "permitNumber": null,
      "version": "2022 CGP (as modified 2025)",
      "authority": "U.S. Environmental Protection Agency",
      "agencyName": "U.S. Environmental Protection Agency",
      "agencyUrl": "https://www.epa.gov/npdes/stormwater-discharges-construction-activities",
      "permitUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
      "effectiveDate": "2022-02-17",
      "expiryDate": "2027-02-16",
      "confidence": "verified"
    },
    "requirements": [
      {
        "id": "inspection.frequency.option1",
        "kind": "inspection",
        "label": "Inspection frequency, option 1",
        "detail": "At least once every seven (7) calendar days",
        "value": 7,
        "citation": {
          "sourceCitation": "Part 4.2.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "At least once every seven (7) calendar days; or",
          "confidence": "verified"
        },
        "because": "You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes."
      },
      {
        "id": "inspection.frequency.option2",
        "kind": "inspection",
        "label": "Inspection frequency, option 2",
        "detail": "Once every 14 calendar days AND within 24 hours of a storm event producing 0.25 inches or more of rain in a 24-hour period, or of a discharge caused by snowmelt from a storm event producing 3.25 inches or more of snow in a 24-hour period.",
        "value": 14,
        "citation": {
          "sourceCitation": "Part 4.2.2 (with Parts 4.2.2a and 4.2.2b)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Once every 14 calendar days and within 24 hours 67 of the occurrence of: A storm event that produces 0.25 inches or more of rain within a 24-hour period. If a storm event produces 0.25 inches or more of rain within a 24-hour period",
          "confidence": "verified"
        },
        "because": "You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes."
      },
      {
        "id": "inspection.report.deadline",
        "kind": "recordkeeping",
        "label": "Inspection report deadline",
        "detail": "Complete the inspection report within 24 hours of completing the site inspection.",
        "value": 24,
        "citation": {
          "sourceCitation": "Part 4.7.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must complete an inspection report within 24 hours of completing any site inspection.",
          "confidence": "verified"
        }
      },
      {
        "id": "inspection.qualifiedPerson",
        "kind": "inspection",
        "label": "Who may inspect",
        "detail": "The person inspecting the site may be a member of your staff or a third party you hire. You are responsible for ensuring that any person conducting inspections is a \"qualified person\", meaning someone who has completed the training required by Part 6.3.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 4.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You are responsible for ensuring that any person conducting inspections pursuant to this Part is a “qualified person.” A qualified person is someone who has completed the training required by Part 6.3.",
          "confidence": "verified"
        },
        "because": "This is why Basinwise cannot perform your inspections. The permit requires a trained person physically on the site."
      },
      {
        "id": "stabilization.initiate",
        "kind": "stabilization",
        "label": "Initiate stabilisation",
        "detail": "\"Immediately\" means as soon as practicable, but no later than the end of the next business day, following the day when the construction activities have temporarily or permanently ceased.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 2.2.14a, Table 2 (definition at footnote 39)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "In the context of this provision, “immediately” means as soon as practicable, but no later than the end of the next business day, following the day when the construction activities have temporarily or permanently ceased.",
          "confidence": "verified"
        },
        "because": "This applies at both land disturbance amounts."
      },
      {
        "id": "stabilization.complete",
        "kind": "stabilization",
        "label": "Complete stabilisation",
        "detail": "Complete the installation of stabilization measures as soon as practicable, but no later than seven (7) calendar days after stabilization has been initiated.",
        "value": 7,
        "citation": {
          "sourceCitation": "Part 2.2.14a, Table 2 row ii",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Complete the installation of stabilization measures as soon as practicable, but no later than seven (7) calendar days after stabilization has been initiated.",
          "confidence": "verified"
        },
        "because": "You have not told us how much land will be open at any one time, so we have assumed the whole 6.5 acres are, which takes the 7 day deadline. The permit measures this on land disturbed at any one time, not the project total: if you phase the work so no more than five acres are open at once, stabilising finished ground before opening more, the deadline is 14 days instead. Tell us your concurrent acreage to get the answer that applies to your site."
      },
      {
        "id": "filing.swpppBeforeNoi",
        "kind": "filing",
        "label": "Plan before Notice of Intent",
        "detail": "Develop the plan before submitting your Notice of Intent for coverage.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 1.4.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must develop a SWPPP consistent with Part 7 before submitting your NOI for coverage under this permit.",
          "confidence": "verified"
        }
      },
      {
        "id": "filing.noi",
        "kind": "filing",
        "label": "Notice of Intent deadline",
        "detail": "At least 14 calendar days before commencing construction activities",
        "value": 14,
        "citation": {
          "sourceCitation": "Part 1.4 (deadline value from Part 1.4.3, Table 1)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "must submit to EPA a complete and accurate NOI in accordance with the deadlines in Table 1 prior to commencement of construction activities",
          "confidence": "verified"
        },
        "because": "This is the deadline for a new site. A transfer to a new operator or an emergency related project has a different deadline."
      },
      {
        "id": "filing.not",
        "kind": "filing",
        "label": "Notice of Termination deadline",
        "detail": "Submit the Notice of Termination within 30 calendar days of meeting a termination condition.",
        "value": 30,
        "citation": {
          "sourceCitation": "Part 8.4",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must submit an NOT within 30 calendar days after any one of the conditions in Part 8.2 occurs.",
          "confidence": "verified"
        }
      },
      {
        "id": "corrective.minor",
        "kind": "corrective_action",
        "label": "Corrective action, minor fix",
        "detail": "By the close of the next business day after discovering the condition.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 5.2.1b",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "When the problem does not require a new or replacement control or significant repair, the corrective action must be completed by the close of the next business day; or",
          "confidence": "verified"
        }
      },
      {
        "id": "corrective.major",
        "kind": "corrective_action",
        "label": "Corrective action, major fix",
        "detail": "Within 7 calendar days of discovery.",
        "value": 7,
        "citation": {
          "sourceCitation": "Part 5.2.1c",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "When the problem requires a new or replacement control or significant repair, install the new or modified control and make it operational, or complete the repair, by no later than seven (7) calendar days from the time of discovery.",
          "confidence": "verified"
        }
      },
      {
        "id": "corrective.documentation",
        "kind": "recordkeeping",
        "label": "Corrective action log entries",
        "detail": "Record the condition within 24 hours of identifying it, and record completion within 24 hours of completing the work.",
        "value": null,
        "citation": {
          "sourceCitation": "Part 5.4.1a",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Within 24 hours of identifying the corrective action condition, document the specific condition and the date and time it was identified.",
          "confidence": "verified"
        }
      },
      {
        "id": "retention.inspection",
        "kind": "recordkeeping",
        "label": "Record retention",
        "detail": "Retain inspection reports and the corrective action log for at least 3 years from the date permit coverage expires or is terminated.",
        "value": 3,
        "citation": {
          "sourceCitation": "Part 4.7.4",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You must retain all inspection reports completed for this Part for at least three (3) years from the date that your permit coverage expires or is terminated.",
          "confidence": "verified"
        },
        "because": "The clock runs from permit expiry or termination, not from when the record was written, so on a multi year project every record stays live for the whole project plus three years."
      },
      {
        "id": "buffer.trigger",
        "kind": "buffer",
        "label": "Natural buffer",
        "detail": "Provide and maintain a natural buffer or equivalent erosion and sediment controls where a surface water lies within 50 feet of the disturbance.",
        "value": 50,
        "citation": {
          "sourceCitation": "Part 2.2.1",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Provide and maintain natural buffers and/or equivalent erosion and sediment controls for discharges to any receiving waters that is located within 50 feet of the site’s earth disturbances.",
          "confidence": "verified"
        }
      }
    ],
    "requirementCount": 14,
    "eligibilityScreens": [
      {
        "id": "esa",
        "label": "Endangered species screening",
        "status": "action_required",
        "detail": "You must document that you meet one of the endangered species protection criteria before coverage begins. This is a screening you complete, not one we can complete for you.",
        "citation": {
          "sourceCitation": "Part 1.1.5 (criteria labels corroborated at Part 9.2.1, Seneca Nation)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You can demonstrate you meet one of the criteria in the Endangered Species Protection section of the Notice of Intent (NOI) that you submit for coverage under this permit, per Part 1.4, with respect to the protection of Federally listed",
          "confidence": "verified"
        }
      },
      {
        "id": "historic",
        "label": "Historic properties screening",
        "status": "action_required",
        "detail": "You must complete the historic properties screening process and keep the documentation with your plan.",
        "citation": {
          "sourceCitation": "Part 1.1.6 (documentation duty at Part 7.2.9b)",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "You have completed the screening process in Appendix E relating to the protection of historic properties; and",
          "confidence": "verified"
        }
      },
      {
        "id": "receiving-water",
        "label": "Receiving water sensitivity",
        "status": "unknown",
        "detail": "You have not confirmed whether the site discharges to a sediment or nutrient impaired water or a Tier 2, 2.5 or 3 water. This changes your inspection frequency, so confirm it before relying on the answer above.",
        "citation": {
          "sourceCitation": "Part 3.2",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "For any portion of the site that discharges to a sediment or nutrient-impaired water or to a water that is identified by your State, Tribe, or EPA as Tier 2, Tier 2.5, or Tier 3 for antidegradation purposes, 57 you must comply with the",
          "confidence": "verified"
        }
      },
      {
        "id": "prohibited",
        "label": "Prohibited discharges",
        "status": "action_required",
        "detail": "Certain discharges are prohibited outright, including concrete washout wastewater unless managed by an approved control. Review the prohibited discharge list against your site activities.",
        "citation": {
          "sourceCitation": "Parts 1.3.1 - 1.3.5",
          "sourceUrl": "https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-permit.pdf",
          "quote": "Wastewater from washout of concrete, unless managed by an appropriate control as described in Part 2.3.4; 1.3.2 Wastewater from washout and/or cleanout of stucco, paint, form release oils, curing compounds, and other construction",
          "confidence": "verified"
        }
      }
    ],
    "notices": [
      "Massachusetts gates plan preparation conditionally. The gate is triggered by plan scope rather than acreage: Attaches to the Wetlands Protection Act pathway. Confirm which case applies to your plan before relying on a generated document.",
      "Basinwise does not perform the physical site inspections the permit requires. Those must be carried out on site by a qualified person.",
      "The source extraction contains the permit body (Parts 1-9) only. Appendices A (Definitions), B (Eligible Permit Areas), C (Small Construction Waivers), D (ESA Eligibility Procedures), E (Historic Property Screening), F (Buffer Requirements), G (Standard Permit Conditions), H (NOI Form), I (NOT Form), J (Chemical Treatment Request) and K (Turbidity Report Form) were NOT present in the extracted text. Every fact whose operative text lives only in an appendix is marked confidence \"unverified\" with a note naming the appendix to confirm."
    ],
    "confidence": "verified",
    "datasetVersion": "2026-07-19"
  },
  "request_id": "req_2f9c41a7b0e84d15",
  "disclaimer": "Basinwise reports publicly published permit requirements and cites the permit section behind each one. It is not legal or engineering advice and it is not a permit. We do not perform the physical site inspections the permit requires; we generate the plan and keep the record. Where a jurisdiction requires a credentialed preparer, the document we generate is a draft for that person to review and sign. Always confirm against your permitting authority's current permit before you break ground.",
  "attribution": "Data from Basinwise (https://basinwise.vercel.app): NPDES stormwater permit requirements, cited to the permit section and carrying a confidence flag. Free responses require this attribution."
}

request

curl https://basinwise.vercel.app/api/v1/jurisdictions

response 200

{
  "data": {
    "count": 52,
    "verifiedCount": 39,
    "coverageNote": "Every jurisdiction we hold a row for is listed, including the ones we have not verified. An unverified row carries confidence \"unverified\" and a note telling you to confirm with the agency: it is not a claim that no permit applies.",
    "jurisdictions": [
      {
        "code": "AK",
        "name": "Alaska",
        "npdesAuthorized": true,
        "governingPermitId": "ak-akr100000",
        "permitNumber": "AKR100000",
        "permitName": "General Permit for Discharges from Large and Small Construction Activities (Construction General Permit), Permit Number AKR100000",
        "agencyName": "Alaska Department of Environmental Conservation (Alaska DEC), Wastewater Discharge Authorization Program",
        "agencyUrl": "https://dot.alaska.gov/stwddes/desenviron/resources/stormwater.shtml",
        "permitUrl": "https://dot.alaska.gov/stwddes/desenviron/assets/pdf/resources/2026_cgp.pdf",
        "confidence": "verified",
        "sourceUrl": "https://dot.alaska.gov/stwddes/desenviron/assets/pdf/resources/2026_cgp.pdf",
        "note": "Effective February 1, 2026, expires January 31, 2031. CREDENTIAL IS TIERED BY ACREAGE, do not flatten it. Section 5.1.2.3 requires the SWPPP to 'Be developed by a qualified person (as defined in Appendix C)'. Appendix C Table 4 sets the SWPPP Preparer standard as: 1 to under 5 acres, be familiar with the permit; 5 to under 20 acres, a SWPPP preparation course is recommended; over 20 acres, be AK-CESCL certified, with CPESC, CESSWI, CPISM, CPSWQ or CISEC accepted as substitutes. No PE stamp is required at any tier. Note the permit was fetched from an Alaska DOT and PF mirror because the issuing agency's own host refused automated retrieval.",
        "credential": {
          "gate": "conditional",
          "summary": "Alaska gates plan preparation conditionally.  Confirm which case applies to your plan before relying on a generated document.",
          "routes": [
            "AK-CESCL certified",
            "Qualified person, tiered by disturbed acreage; AK-CESCL certification (or CPESC, CESSWI, CPISM, CPSWQ, CISEC) required above 20 acres"
          ],
          "stateCourseRequired": false,
          "sourceCitation": "2021 Alaska CGP Part 5.1.2.3",
          "sourceUrl": "https://dec.alaska.gov/media/22136/2021-cgp-pmt-akr10-fnl-20201217.pdf",
          "confidence": "verified"
        }
      },
      {
        "code": "AL",
        "name": "Alabama",
        "npdesAuthorized": true,
        "governingPermitId": "al-alr100000",
        "permitNumber": "ALR100000",
        "permitName": "NPDES General Permit No. ALR100000, Construction General Permit (CGP)",
        "agencyName": "Alabama Department of Environmental Management (ADEM)",
        "agencyUrl": "https://adem.alabama.gov/water/npdes-programs/construction-general-permit",
        "permitUrl": "https://adem.alabama.gov/sites/default/files/2026-02/CGP2026.pdf",
        "confidence": "verified",
        "sourceUrl": "https://adem.alabama.gov/water/npdes-programs/construction-general-permit",
        "note": "Credential: ADEM requires a Qualified Credentialed Professional to prepare the Construction Best Management Practice Plan (CBMPP), and both the Responsible Official and the QCP must sign. Accepted credentials are PE, CPESC and CDSEC. Generated plans are drafts for a QCP to review, amend and sign. Caveat: the CGP PDF is a scanned image with no text layer, so the permit number and the QCP rule were verified from ADEM web pages rather than machine-read permit body text.",
        "credential": {
          "gate": "gated",
          "summary": "Alabama requires a credentialed preparer. Treat the generated document as a complete draft for that person to review, adopt and sign. It is not by itself a compliant filed plan.",
          "routes": [
            "PE",
            "CPESC",
            "Landscape architect",
            "Surveyor",
            "PG",
            "Forester",
            "REM",
            "Soil scientist"
          ],
          "stateCourseRequired": false,
          "sourceCitation": "ADEM Admin. Code r. 335-6-12-.21(2)(a) and .02(r)",
          "sourceUrl": "https://adem.alabama.gov/sites/default/files/2026-03/Division6Vol1.pdf",
          "confidence": "verified"
        }
      },
      {
        "code": "AR",
        "name": "Arkansas",
        "npdesAuthorized": true,
        "governingPermitId": "ar-arr150000",
        "permitNumber": "ARR150000",
        "permitName": "Authorization to Discharge Stormwater Under the NPDES and the Arkansas Water and Air Pollution Control Act (Construction General Permit ARR150000)",
        "agencyName": "Arkansas Department of Energy and Environment, Division of Environmental Quality (Arkansas DEQ), Office of Water Quality",
        "agencyUrl": "https://www.adeq.state.ar.us/water/permits/npdes/stormwater/",
        "permitUrl": "https://www.adeq.state.ar.us/water/permits/npdes/stormwater/pdfs/construction/arr150000-final-permit_2026-11-01.pdf",
        "confidence": "verified",
        "sourceUrl": "https://www.adeq.state.ar.us/water/permits/npdes/stormwater/pdfs/construction/arr150000-final-permit_2026-11-01.pdf",
        "note": "Credential: no preparer credential. The permit requires that 'The SWPPP shall be prepared by qualified personnel using sound engineering practices', and defines qualified personnel by knowledge rather than certification. HOWEVER Arkansas DOES credential INSPECTORS: personnel conducting site inspections must hold either EPA construction inspection training completion or a valid construction inspection certification. That is an inspection credential, not a preparation credential.",
        "credential": {
          "gate": "open",
          "summary": "No preparer credential was found for Arkansas. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.",
          "routes": [],
          "stateCourseRequired": false,
          "sourceCitation": null,
          "sourceUrl": "https://www.adeq.state.ar.us/water/permits/npdes/stormwater/pdfs/construction/arr150000-final-permit_2026-11-01.pdf",
          "confidence": "verified"
        }
      }
    ],
    "truncated_for_docs": "Showing 3 of 52 jurisdictions. The live endpoint returns all of them."
  },
  "request_id": "req_2f9c41a7b0e84d15",
  "disclaimer": "Basinwise reports publicly published permit requirements and cites the permit section behind each one. It is not legal or engineering advice and it is not a permit. We do not perform the physical site inspections the permit requires; we generate the plan and keep the record. Where a jurisdiction requires a credentialed preparer, the document we generate is a draft for that person to review and sign. Always confirm against your permitting authority's current permit before you break ground.",
  "attribution": "Data from Basinwise (https://basinwise.vercel.app): NPDES stormwater permit requirements, cited to the permit section and carrying a confidence flag. Free responses require this attribution."
}

request

curl https://basinwise.vercel.app/api/v1/jurisdictions/CA

response 200

{
  "data": {
    "code": "CA",
    "name": "California",
    "npdesAuthorized": true,
    "governingPermitId": "ca-cas000002",
    "permitNumber": "CAS000002",
    "permitName": "Construction General Permit, Order WQ 2022-0057-DWQ (NPDES No. CAS000002)",
    "agencyName": "California State Water Resources Control Board (State Water Board)",
    "agencyUrl": "https://www.waterboards.ca.gov/water_issues/programs/stormwater/construction.html",
    "permitUrl": "https://www.waterboards.ca.gov/water_issues/programs/stormwater/construction/docs/2022-0057-dwq-with-attachments/cgp2022_order.pdf",
    "confidence": "verified",
    "sourceUrl": "https://www.waterboards.ca.gov/water_issues/programs/stormwater/construction/docs/2022-0057-dwq-with-attachments/cgp2022_order.pdf",
    "note": "Permit Section V.C.1: the discharger must retain a QSD from the beginning of the project through Notice of Termination approval. Section 1641 requires the signature of the QSD who prepared the SWPPP. Generated SWPPPs are drafts for a QSD to review, amend and sign. A Qualified SWPPP Practitioner (QSP) is separately required for implementation and inspections.",
    "credential": {
      "gate": "gated",
      "summary": "California requires a credentialed preparer. Treat the generated document as a complete draft for that person to review, adopt and sign. It is not by itself a compliant filed plan.",
      "routes": [
        "California PE or PG (self-certify)",
        "Landscape architect, AIH hydrologist, CPESC or CPSWQ plus CASQA training and exam"
      ],
      "stateCourseRequired": true,
      "sourceCitation": "Order WQ 2022-0057-DWQ Attachment D, sections II.C, V.C.1 and V.F",
      "sourceUrl": "https://www.waterboards.ca.gov/board_decisions/adopted_orders/water_quality/2022/wqo_2022-0057-dwq.pdf",
      "confidence": "verified"
    }
  },
  "request_id": "req_2f9c41a7b0e84d15",
  "disclaimer": "Basinwise reports publicly published permit requirements and cites the permit section behind each one. It is not legal or engineering advice and it is not a permit. We do not perform the physical site inspections the permit requires; we generate the plan and keep the record. Where a jurisdiction requires a credentialed preparer, the document we generate is a draft for that person to review and sign. Always confirm against your permitting authority's current permit before you break ground.",
  "attribution": "Data from Basinwise (https://basinwise.vercel.app): NPDES stormwater permit requirements, cited to the permit section and carrying a confidence flag. Free responses require this attribution."
}

request

curl "https://basinwise.vercel.app/api/v1/credentials?state=CA"

response 200

{
  "data": {
    "state": "CA",
    "name": "California",
    "acres": null,
    "gate": "gated",
    "appliesToThisSite": true,
    "summary": "California requires a credentialed preparer. Treat the generated document as a complete draft for that person to review, adopt and sign. It is not by itself a compliant filed plan.",
    "routes": [
      "California PE or PG (self-certify)",
      "Landscape architect, AIH hydrologist, CPESC or CPSWQ plus CASQA training and exam"
    ],
    "stateCourseRequired": true,
    "peStamp": null,
    "sourceCitation": "Order WQ 2022-0057-DWQ Attachment D, sections II.C, V.C.1 and V.F",
    "sourceUrl": "https://www.waterboards.ca.gov/board_decisions/adopted_orders/water_quality/2022/wqo_2022-0057-dwq.pdf",
    "confidence": "verified",
    "note": "The SWPPP shall be developed by a Qualified SWPPP Developer (QSD). No PE stamp mandate.",
    "documentStatus": "A document generated for this site is a DRAFT for a credentialed preparer to review, amend and sign. It is not by itself a compliant filed plan."
  },
  "request_id": "req_2f9c41a7b0e84d15",
  "disclaimer": "Basinwise reports publicly published permit requirements and cites the permit section behind each one. It is not legal or engineering advice and it is not a permit. We do not perform the physical site inspections the permit requires; we generate the plan and keep the record. Where a jurisdiction requires a credentialed preparer, the document we generate is a draft for that person to review and sign. Always confirm against your permitting authority's current permit before you break ground.",
  "attribution": "Data from Basinwise (https://basinwise.vercel.app): NPDES stormwater permit requirements, cited to the permit section and carrying a confidence flag. Free responses require this attribution."
}

request

curl https://basinwise.vercel.app/api/v1/pricing

response 200

{
  "data": {
    "currency": "usd",
    "unit": "Metered by billable call once you send a live key on a paid plan. Anonymous, sandbox and test-key calls never bill; they are rate-limited instead.",
    "determinism": "Every response is a projection of a cited permit plus deterministic arithmetic. There is no model in the request path, so the same site always returns the same determination. Every requirement carries the permit section it came from (`citation.sourceCitation`, e.g. \"2022 CGP Part 4.1.2\") and a `confidence` of \"verified\" or \"unverified\"; render \"unverified\" as Unverified, never as fact. Where we have not read a jurisdiction's permit we return no requirements and say so in `notices`, rather than substituting another permit's numbers. Every determination is stamped with the `datasetVersion` it was computed against, so a saved answer stays defensible after the dataset moves.",
    "anonymous": {
      "price_usd": 0,
      "rate_limit_per_minute": 4,
      "rate_limit_per_day": 20,
      "api_access": false,
      "note": "No key needed. Every endpoint on this API works at this throttled rate. There is no paid endpoint: what a paid plan buys is the generated plan document and the retained inspection record in the app, plus a higher API throttle."
    },
    "sandbox_key": {
      "key": "bw_test_sandbox",
      "rate_limit_per_minute": 10,
      "rate_limit_per_day": 200,
      "bills": false,
      "note": "A public sandbox key that works with no signup, so an agent succeeds on first contact. It is throttled per IP at the test-key rate and never bills. Your own free test key gives you a bucket nobody else shares."
    },
    "test_key": {
      "rate_limit_per_minute": 10,
      "rate_limit_per_day": 200,
      "bills": false,
      "note": "A bw_test_ key (see /api/v1 auth) runs the real engine against the real permit dataset, never bills, and only raises the anonymous throttle."
    },
    "plans": [
      {
        "id": "free",
        "name": "Free",
        "price_usd_per_month": 0,
        "cadence": "free forever",
        "tagline": "Screen one site. No card, no signup.",
        "included_api_calls_per_month": 0,
        "rate_limit_per_minute": 0,
        "saved_sites": 0,
        "seats": 1,
        "api_access": false,
        "site_history": false,
        "swppp_document": false,
        "inspection_log": false,
        "exports": false,
        "priority_support": false,
        "features": [
          "Single-site screening, runs in your browser so site data is never transmitted",
          "Which permit governs the site, with the permit section cited",
          "Eligibility screens, inspection frequency and stabilisation deadlines",
          "Every jurisdiction page, with the agency and permit linked",
          "Test API key for developers and agents (throttled, never bills)",
          "Public API and MCP at the anonymous rate"
        ]
      },
      {
        "id": "pro",
        "name": "Pro",
        "price_usd_per_month": 49,
        "cadence": "per month",
        "tagline": "For the contractor or manager running live sites.",
        "included_api_calls_per_month": 1000,
        "rate_limit_per_minute": 60,
        "saved_sites": "unlimited",
        "seats": 1,
        "api_access": true,
        "site_history": true,
        "swppp_document": true,
        "inspection_log": true,
        "exports": true,
        "priority_support": false,
        "features": [
          "Site-specific plan document, generated from your site and downloadable",
          "The retained inspection and corrective-action record the permit requires you to keep",
          "Unlimited saved sites, each with the permit version it was determined against",
          "Amendment tracking, so a change to the site is dated and recorded",
          "Export the record as CSV and the plan document for print",
          "Stormwater permit API, 1,000 calls/mo included",
          "Hosted MCP server at your plan's burst rate instead of the anonymous rate",
          "Inspectable request log"
        ]
      },
      {
        "id": "scale",
        "name": "Scale",
        "price_usd_per_month": 149,
        "cadence": "per month",
        "tagline": "For builders running a portfolio, and products built on the API.",
        "included_api_calls_per_month": 10000,
        "rate_limit_per_minute": 300,
        "saved_sites": "unlimited",
        "seats": 1,
        "api_access": true,
        "site_history": true,
        "swppp_document": true,
        "inspection_log": true,
        "exports": true,
        "priority_support": true,
        "features": [
          "Everything in Pro",
          "10,000 API calls/mo",
          "300 requests/minute burst",
          "Priority support"
        ]
      }
    ],
    "checkout": {
      "note": "There is no machine-callable checkout API: a signed-in human starts Stripe Checkout from the billing page. An agent choosing a plan on a user's behalf should direct them to upgrade_url.",
      "upgrade_url": "https://basinwise.vercel.app/pricing"
    }
  },
  "request_id": "req_2f9c41a7b0e84d15",
  "disclaimer": "Basinwise reports publicly published permit requirements and cites the permit section behind each one. It is not legal or engineering advice and it is not a permit. We do not perform the physical site inspections the permit requires; we generate the plan and keep the record. Where a jurisdiction requires a credentialed preparer, the document we generate is a draft for that person to review and sign. Always confirm against your permitting authority's current permit before you break ground.",
  "attribution": "Data from Basinwise (https://basinwise.vercel.app): NPDES stormwater permit requirements, cited to the permit section and carrying a confidence flag. Free responses require this attribution."
}