Who needs a SWP3 in Oklahoma?
Any construction project that disturbs one acre or more — or is part of a larger common plan of development reaching one acre — needs a SWP3 under Oklahoma permit OKR10 (Standard Site) (standard construction site), or OKR10 (High Priority Site) (high priority construction site (part 3.4)).
Oklahoma runs its own delegated stormwater program. Operators obtain coverage from Oklahoma Department of Environmental Quality (ODEQ), Water Quality Division under OPDES General Permit OKR10 for Stormwater Discharges from Construction Activities (OKR10 (Standard Site) / OKR10 (High Priority Site)), not directly from the EPA. A small subdivision, a solar pad, and a road-widening project all clear the same one-acre line.
Oklahoma adds requirements worth flagging early: Plan is a Stormwater Pollution Prevention Plan (SWP3) prepared before the NOI and kept up to date; include a copy of the permit (Parts 5.1.A, 5.2.A, 5.3.H); Submit the NOI (DEQ Form 606-002A) with the application and annual permit fees at least 14 days before construction; do not begin earth disturbance until DEQ issues an authorization (Parts 3.2.B–D, 3.5.A); High priority construction sites (40 or more disturbed acres; discharging within one mile of a water 303(d)-listed for sediment or turbidity; or located within an ARC, ORW, or TMDL/watershed-plan water) have stricter buffer, sediment basin, stabilization, and inspection requirements (Parts 3.4, 4.6.B); Post a notice near the main entrance with the permit number (or NOI copy), a local contact name and phone number, a brief project description, and the SWP3 location if the site is inactive (Part 5.2.B); Contractor certifications from contractors and subcontractors in the SWP3 (Part 5.3.D); An inspection form developed and included in the SWP3; corrective action reports within 24 hours and 7 calendar days of discovery (Parts 5.4.A, 5.5.B); Submit an updated SWP3 within 14 days if DEQ requests it; make changes DEQ requires within 7 calendar days of notice and certify them (Parts 3.2.A, 5.2.D).
What the plan must contain
An Oklahoma SWP3is the site's compliance binder — the document an inspector opens first. It documents:
- 1Site & project descriptionTotal and disturbed acreage, soils, slopes, and the sequence of construction.
- 2Receiving waters & discharge pointsWhere stormwater leaves the site and the waterbodies it reaches.
- 3Erosion & sediment control BMPsSilt fence, stabilized entrances, inlet protection, and stabilization measures.
- 4Inspection schedule & recordsDated, signed inspection logs and the corrective actions taken.
- 5Operator certificationThe SWP3 is signed by the legally responsible party before work begins.
Required and conditional BMPs
| Best management practice | Category | Status |
|---|---|---|
| Perimeter silt fence / sediment barrier | Sediment control | Required |
| Stabilized construction entrance | Tracking control | Required |
| Storm drain inlet protection | Sediment control | Required |
| Soil stabilization (seeding, mulch, blankets) | Erosion control | Required |
| Concrete washout containment | Good housekeeping | Required |
| Sediment basin or trap | Sediment control | Conditional |
| Dewatering / turbidity controls | Pollution prevention | Conditional |
Filing your Notice of Intent
Submit the NOI (DEQ Form 606-002A) and fees to the DEQ Stormwater Unit (Environmental Complaints and Local Services) by mail, fax, or email (ECLS-StormwaterPermitting@deq.ok.gov), or through DEQ’s online NOI tool once available, at least 14 days before construction begins.
A Notice of Termination closes coverage once the site reaches final stabilization. Keeping the SWP3 and its inspection records on site is what keeps a project clear of stop-work orders.
Inspection requirements
Inspect at least once every 14 calendar days and within 24 hours of the end of a storm producing 0.5 inch of rain or more (also within 24 hours of a discharge generated by snowmelt, and while the discharge is occurring when a 0.5-inch storm or snowmelt causes the site to discharge (within 24 hours of the end of the storm or the beginning of the snowmelt discharge)) (OKR10 Part 5.4.B and Table 5-1). Areas where stabilization meeting Part 4.3 has been initiated may be inspected once per month until construction activity resumes there (OKR10 Part 5.4.C); inspections are required only during normal working hours, and when the 24-hour window falls entirely outside them, inspect by the end of the next business day (Part 5.4 footnote 19). Every inspection is dated and signed, and any failed control is corrected before the next storm.
| Trigger | Requirement |
|---|---|
| Routine | At least once every 14 calendar days and within 24 hours of the end of a storm producing 0.5 inch of rain or more (also within 24 hours of a discharge generated by snowmelt, and while the discharge is occurring when a 0.5-inch storm or snowmelt causes the site to discharge (within 24 hours of the end of the storm or the beginning of the snowmelt discharge)) |
How Oklahoma differs from the federal permit
| Oklahoma | Federal (EPA) | |
|---|---|---|
| Authority | Oklahoma Department of Environmental Quality (ODEQ), Water Quality Division | U.S. EPA |
| Permit | OKR10 (Standard Site) / OKR10 (High Priority Site) | EPA CGP |
| Disturbance threshold | 1 acre | 1 acre |
| Plan name | SWP3 | SWPPP |
Because Oklahoma administers its own program, the federal EPA Construction General Permit does not apply directly here — the state permit governs. Sites inside a regulated municipal storm sewer system may carry additional local ordinance requirements on top of the state permit.
Frequently asked questions
Does Oklahoma require an engineer to prepare the SWP3?+–
No. Oklahoma does not require a licensed PE stamp on a construction SWP3 statewide. The operator certifies the plan; engineer review is optional for complex sites.
What is the disturbance threshold in Oklahoma?+–
One acre — including sites under an acre that are part of a larger common plan of development totaling one acre or more.
How often must inspections happen in Oklahoma?+–
Inspect at least once every 14 calendar days and within 24 hours of the end of a storm producing 0.5 inch of rain or more (also within 24 hours of a discharge generated by snowmelt, and while the discharge is occurring when a 0.5-inch storm or snowmelt causes the site to discharge (within 24 hours of the end of the storm or the beginning of the snowmelt discharge)) (OKR10 Part 5.4.B and Table 5-1). Areas where stabilization meeting Part 4.3 has been initiated may be inspected once per month until construction activity resumes there (OKR10 Part 5.4.C); inspections are required only during normal working hours, and when the 24-hour window falls entirely outside them, inspect by the end of the next business day (Part 5.4 footnote 19).
Is a SWP3 the same as a SWPPP?+–
Yes. Oklahoma uses the term "SWP3" for what other states call a SWPPP — the same plan and the same requirements.
Oklahoma-ready in minutes
Siltworks fills in your site data automatically, applies the Oklahoma requirements, and hands you an inspection-ready SWP3 — at 70–90% less than a consultant.
Requirements summarized from the publicly available OPDES General Permit OKR10 for Stormwater Discharges from Construction Activities (OKR10 (Standard Site) / OKR10 (High Priority Site)) for planning purposes. The operator must review and certify every SWP3 before use.