Ohio
The stormwater permit for construction in Ohio
Ohio 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
General Permit Authorization for Stormwater Discharges Associated with Construction Activity Under the National Pollutant Discharge Elimination System (OHC000006)
- Issued by
- Ohio Environmental Protection Agency (Ohio EPA)
- Permit number
- OHC000006
- Version determined against
- as published by the state agency
- Effective
- 2023-04-23
- Expires
- 2028-04-22
Who may prepare the plan
No preparer credential foundNo preparer credential was found for Ohio. 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.
No preparer credential found in the reviewed sources. Not exhaustively verified; confirm with the state agency and any local ordinance.
No permit section cited. Confirm this with your permitting authority.
Does a site in Ohio 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
- Requirements below are what we have read and cited directly from General Permit Authorization for Stormwater Discharges Associated with Construction Activity Under the National Pollutant Discharge Elimination System (OHC000006), not the federal CGP. A category we have not yet transcribed from this permit is omitted here rather than assumed to match EPA's rule.
- Ohio's general permit contains no numeric effluent limits or benchmarks (turbidity, pH, TSS, etc.) for ordinary construction-site discharges — Part V.V 'General Effluent Limitation' is narrative only ('free of substances... in amounts that will...'), with no numeric thresholds. The only numeric percentage figures found in the permit body are (a) the 70% vegetative-cover density that defines 'final stabilization' (Part VII.M) and (b) the 80% TSS-removal / 20 mg/L effluent criteria used only to qualify an alternative post-construction BMP for approval (Part III.G.2.e.x), not a discharge limit on ordinary runoff. Ohio has no acreage-tiered stabilization-completion deadline like federal Table 2; instead it uses a two-table (permanent/temporary) system keyed to proximity to surface waters and dormancy duration (Part II.B), modeled below with new state.oh.* ids rather than forced into the federal stabilization.complete.* ids. No explicit numeric hours/days deadline was found in the permit text for how soon after an inspection the written inspection report/checklist itself must be completed (only that it must be completed following each inspection), so inspection.report.deadline is omitted rather than invented. Appendices A (Big Darby Creek Watershed) and B (Olentangy River Watershed) contain additional watershed-specific requirements (including a shorter 45-day pre-construction NOI deadline and mandatory SWP3-with-NOI submission) that were not further explored in this pass.
- No preparer credential was found for Ohio. 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.
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
Ohio. The state runs its own programme under OHC000006.
- 3
Preparer credential
No preparer credential was found for Ohio. 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 General Permit Authorization for Stormwater Discharges Associated with Construction Activity Under the National Pollutant Discharge Elimination System (OHC000006) directly. It is linked above, and it is the document an inspector will hold you to. Ohio Environmental Protection Agency (Ohio EPA)
- 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 Ohio
- 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 Ohio
Screen a Ohio site now
Runs in your browser. Nothing about the site is transmitted.
What people ask about the Ohio construction stormwater permit
Do I need a stormwater permit for a construction site in Ohio?
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 Ohio?
Ohio Environmental Protection Agency (Ohio EPA) issues General Permit Authorization for Stormwater Discharges Associated with Construction Activity Under the National Pollutant Discharge Elimination System (OHC000006).
Does Ohio require a qualified preparer for the plan?
No preparer credential was found for Ohio. 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 Ohio will ask you for
The screening is free. Holding the written plan and the retained inspection log is what the permit actually demands.