Compare Regulations
Compare state-level permit requirements side-by-side (up to 4 states)
IN(3 more)
Rows with an amber indicator differ across selected states.
| Field | IN Indiana |
|---|---|
| NPDES Program | State-Delegated |
| Permitting Agency | Indiana Department of Environmental Management (IDEM) |
| Permit Name | NPDES Construction Stormwater General Permit (Rule 5 / Permit INR100000) |
| 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 and approved before earth-disturbing activities begin; no fixed calendar lead time is prescribed, but IDEM review typically takes several business days |
| Application Method | Online via IDEM's myidem.in.gov portal (electronic NOI submission); paper NOI also accepted but online is preferred |
| Permit Fee | $100 per NOI filing (flat fee); no acreage-based scaling |
| SWPPP Required | Yes |
| PE Certification Required | No |
| SWPPP Template Available | Yes |
| Inspection Frequency | At least every 7 days and within 24 hours after a storm event producing ≥ 0.5 inches of rainfall in a 24-hour period; frequency may be reduced to every 14 days when the entire site is temporarily stabilized or runoff is unlikely due to winter conditions |
| Inspector Qualification | Inspections must be conducted by a qualified inspector who is knowledgeable about the permit requirements and BMP implementation; Indiana does not mandate a specific state-issued certification, but IDEM recommends Certified Inspector of Sediment and Erosion Control (CISEC) or equivalent training |
| Post-Construction Required | Yes |
| Turbidity Standard | No numeric NTU effluent limit in the general permit; narrative standard applies |