Compare Regulations
Compare state-level permit requirements side-by-side (up to 4 states)
IA(3 more)
Rows with an amber indicator differ across selected states.
| Field | IA Iowa |
|---|---|
| NPDES Program | State-Delegated |
| Permitting Agency | Iowa Department of Natural Resources (IDNR) |
| Permit Name | NPDES General Permit No. 2 — Stormwater Discharge Associated with Industrial Activity from Construction Activities (Permit IAR100000) |
| Construction Threshold | ≥ 1 acre of land disturbance; < 1 acre if part of a larger common plan of development or sale |
| NOI Lead Time | A complete NOI must be submitted and an authorization approved and issued by DNR before operations or soil-disturbing activities begin; coverage is not automatic upon submittal |
| Application Method | Online via Iowa DNR's EQ (Electronic Reporting and Permitting) portal at https://www.iowadnr.gov/environmental-protection/water-quality/stormwater-program/stormwater-permit-information; paper NOI also accepted |
| Permit Fee | Stormwater general permit NOI fees: $175 (1 year), $350 (3 years), $525 (4 years), or $700 (5 years). Individual stormwater-only permits: $1,250 for a five-year permit if the discharge will not reach an Outstanding Iowa Water (OIW); $500 for a two-year permit if the discharge will reach an OIW |
| SWPPP Required | Yes |
| PE Certification Required | No |
| SWPPP Template Available | Yes |
| Inspection Frequency | At least every 7 days and within 24 hours after any storm event producing ≥ 0.5 inches of rainfall in a 24-hour period; inspection frequency may be reduced to every 14 days during periods of frozen ground and no construction activity |
| Rain Inspection Trigger | Within 24 hours of a storm event producing ≥ 0.5 inches of rainfall in a 24-hour period |
| Inspector Qualification | Inspector must be a qualified person who is knowledgeable in the principles and practice of erosion and sediment controls and familiar with the SWPPP; Iowa does not require a specific state-issued inspector certification for construction stormwater |
| Inspector Certifications | No state-specific cert required; CPESC, CISEC accepted; inspector must be 'knowledgeable in the principles and practice of erosion and sediment control' |
| Post-Construction Required | Yes |
| Turbidity Standard | No numeric NTU effluent limit in General Permit No. 2; narrative standard applies |