Skip to content
Basinwise

Oregon

The stormwater permit for construction in Oregon

Oregon runs its own NPDES programme, so a state issued construction general permit governs. Below is what our engine can say about it, and where we have not read that permit, what it will not say.

Governing permit

NPDES Construction Stormwater Discharge General Permit 1200-C

Issued by
Oregon Department of Environmental Quality (Oregon DEQ)
Permit number
1200-C
Version determined against
as published by the state agency
Read the permitOregon Department of Environmental Quality (Oregon DEQ)

Who may prepare the plan

Conditional, depends on the site

Oregon gates plan preparation only above a threshold this site does not meet. The gate applies at 20 acres or more. This site is 1 acres. On what we have verified, a generated plan can be adopted without a credentialed signature.

Qualifying routes

  • CPESC
  • CPSWQ
  • Oregon PE
  • Oregon RLA
  • CEG
  • CPESC, CPSWQ, Oregon Registered PE, Oregon Registered Landscape Architect or Oregon Certified Engineering Geologist (conditional: 20 or more acres, certain near-buffer-zone compliance options, or engineered facilities)

Oregon gates only at 20 acres or more, or where engineered facilities are involved. Reconciled against the jurisdiction registry, which found a preparer requirement this entry had missed. Where the two sources disagreed we kept the stricter answer.

VerifiedPermit 1200-C Schedule A.21.e-gSource

Does a site in Oregon 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

Verified

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

  • We have identified NPDES Construction Stormwater Discharge General Permit 1200-C as the governing permit but have not loaded its requirements. The requirements below are not shown because we will not substitute the federal permit's rules for a state's. Confirm with Oregon Department of Environmental Quality (Oregon DEQ).
  • Oregon gates plan preparation only above a threshold this site does not meet. The gate applies at 20 acres or more. This site is 1 acres. On what we have verified, a generated plan can be adopted without a credentialed signature.
  • Basinwise does not perform the physical site inspections the permit requires. Those must be carried out on site by a qualified person.
How this answer was reached, step by step
  1. 1

    Coverage threshold

    The project disturbs 1 acres, at or above the 1 acre threshold, so it needs permit coverage.

    VerifiedPart 1.1.2Source
  2. 2

    Permitting authority

    Oregon. The state runs its own programme under 1200-C.

  3. 3

    Preparer credential

    Oregon gates plan preparation only above a threshold this site does not meet. The gate applies at 20 acres or more. This site is 1 acres. On what we have verified, a generated plan can be adopted without a credentialed signature.

    VerifiedPermit 1200-C Schedule A.21.e-gSource

What to do next

  1. 1. Confirm the governing permit. Read NPDES Construction Stormwater Discharge General Permit 1200-C directly. It is linked above, and it is the document an inspector will hold you to. Oregon Department of Environmental Quality (Oregon DEQ)
  2. 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 Oregon
  3. 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. 4. Read the requirements in full. SWPPP requirements in Oregon

Screen a Oregon site now

Runs in your browser. Nothing about the site is transmitted.

Screen your site

Runs in your browser

Total land disturbance over the whole project, including staging and access. This decides whether you need a permit at all.

Optional. If you phase the work, the most that will be disturbed at once. Leave blank if the whole site is open together. The stabilisation deadline turns on this figure, not the total.

A half acre lot inside a 40 acre subdivision is covered even though the lot alone is under the threshold. This is the most commonly missed trigger in the permit.

Receiving water and site conditions(optional, but they change the inspection frequency)

May allow a reduced inspection frequency during the seasonally dry period.

EPA keeps permitting authority in Indian country even inside a state that runs its own programme.

No account, no card, nothing transmitted.

What people ask about the Oregon construction stormwater permit

Do I need a stormwater permit for a construction site in Oregon?

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 Oregon?

Oregon Department of Environmental Quality (Oregon DEQ) issues NPDES Construction Stormwater Discharge General Permit 1200-C.

Does Oregon require a qualified preparer for the plan?

Oregon gates plan preparation only above a threshold this site does not meet. The gate applies at 20 acres or more. This site is 1 acres. On what we have verified, a generated plan can be adopted without a credentialed signature.

Keep the record Oregon will ask you for

The screening is free. Holding the written plan and the retained inspection log is what the permit actually demands.

See pricingAll states