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 | NOI must be submitted to IDNR at least 2 business days before commencement of land-disturbing activities; authorization is automatic upon submittal if the NOI is complete |
| Application Method | Online via Iowa DNR's EQ (Electronic Reporting and Permitting) portal at https://programs.iowadnr.gov/npdespermits/; paper NOI also accepted |
| Permit Fee | No permit application fee for NPDES General Permit No. 2 (construction stormwater); fees may apply for individual NPDES permits |
| 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 |
| 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 |
| Post-Construction Required | Yes |
| Turbidity Standard | No numeric NTU effluent limit in General Permit No. 2; narrative standard applies |