New Hampshire
The stormwater permit for construction in New Hampshire
New Hampshire is not NPDES authorised for construction stormwater, so EPA is the permitting authority and its 2022 Construction General Permit governs directly. That permit is one we have read, so the requirements below are real and cited.
Governing permit
2022 Construction General Permit
- Issued by
- U.S. Environmental Protection Agency
- Version determined against
- 2022 CGP (as modified 2025)
- Effective
- 2022-02-17
- Expires
- 2027-02-16
Who may prepare the plan
No preparer credential foundNo preparer credential was found for New Hampshire. 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.
EPA is the permitting authority. Coverage is under EPA's 2022 CGP, permit area NHR100000. CGP Part 9.1.1 states that if you disturb 100,000 square feet or more of contiguous area you must also comply with RSA 485-A:17 and Env-Wq 1500 and, unless exempt, apply for an Alteration of Terrain permit from NHDES; the threshold drops to 50,000 square feet within the protected shoreline. Whether the AoT regime imposes its own plan preparer credential was NOT verified (des.nh.gov refused automated retrieval), so confirm with NHDES. 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.
No permit section cited. Confirm this with your permitting authority.
Does a site in New Hampshire need coverage
Worked for a one acre site as a reference point. Change the acreage in the tool below and the answer, and its reasoning, change with it.
Coverage
Permit coverage required
The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.
Determined against dataset version 2026-07-19.
Read these before you act on the answer
- No preparer credential was found for New Hampshire. 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.
- 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.
How this answer was reached, step by step
- 1
Coverage threshold
The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.
- 2
Permitting authority
EPA. NH is not an NPDES authorized state, so EPA's Construction General Permit governs directly.
- 3
Preparer credential
No preparer credential was found for New Hampshire. 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.
What to do next
- 1. Confirm the governing permit. Read 2022 Construction General Permit directly. It is linked above, and it is the document an inspector will hold you to. U.S. Environmental Protection Agency (EPA Region 1)
- 2. Settle the preparer question before you draft. Getting this wrong costs a redraft at best. The detail is on the credential page for this state. Preparer credential in New Hampshire
- 3. Screen the site. Run the real acreage and receiving water facts through the tool below. You get the inspection frequency, the stabilisation deadlines and the filing path with the permit section behind each.
- 4. Read the requirements in full. SWPPP requirements in New Hampshire
Screen a New Hampshire site now
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What people ask about the New Hampshire construction stormwater permit
Do I need a stormwater permit for a construction site in New Hampshire?
Permit coverage is triggered at one acre of land disturbance, and below one acre if the project is part of a larger common plan of development or sale that will ultimately disturb an acre or more. The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.
Who issues the construction stormwater permit in New Hampshire?
U.S. Environmental Protection Agency issues 2022 Construction General Permit.
Does New Hampshire require a qualified preparer for the plan?
No preparer credential was found for New Hampshire. 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.
Keep the record New Hampshire will ask you for
The screening is free. Holding the written plan and the retained inspection log is what the permit actually demands.