INState-AdministeredSWPPP Requirements in Indiana
Indiana regulates construction stormwater under the Construction Stormwater General Permit (CSGP; NPDES INRA00000) authorized in 327 IAC 15-5 and administered by IDEM. All projects disturbing 1+ acre must obtain coverage by filing an NOI via IDEM's Regulatory ePortal (MyIDEM). A SWPPP must be developed and implemented before earth disturbance begins.
Indiana SWPPP Key Facts
- ✓CSGP (INRA00000) under 327 IAC 15-5 is Indiana's statewide construction stormwater general permit
- ✓NOI filed through MyIDEM online portal — paper submissions not accepted
- ✓SWPPP must be on site and available for IDEM inspection at all times
- ✓$0 NOI fee
- ✓Common plan of development aggregation applies statewide
Administering Agency
- Agency
- Indiana Department of Environmental Management (IDEM)
- Phone
- 317-232-8160
- stormwater@idem.in.gov
- Website
- IDEM Stormwater Program
Permit Details
- Permit Name
- Construction Stormwater General Permit (CSGP; 327 IAC 15-5)
- Permit Number
- INRA00000
- Effective Date
- 2021-12-18
- Expiration Date
- 2026-12-17
- Permit Document
- View Current Permit
SWPPP Thresholds & Triggers
- Acreage Threshold
- 1 acre of land disturbance
CSGP coverage is authorized under 327 IAC 15-5. Projects in regulated MS4 jurisdictions may have additional local requirements. Common plan of development provisions aggregate smaller parcels.
Inspection Requirements
- Inspection Frequency
- At least once every 7 days and within 24 hours after a rainfall event of 0.5 inches or more
- Rain Event Threshold
- 0.5 inches in 24 hours
- Certified Inspector
- Required by state
- Accepted Certifications
- CPESC, CESSWI, IDEM-recognized Storm Water Inspector
NOI must be filed through IDEM's MyIDEM online portal. Construction cannot begin until NOI is processed.
Penalties & Enforcement
- Max Civil Penalty (Per Day)
- $25,000 per day per violation
- Criminal Penalties
- Class D felony for knowing violations causing significant harm
IDEM field inspectors conduct site visits; complaint-driven inspections are common.
Permit Fees
- NOI Filing Fee
- $0
- Other Fees
- Local MS4 fees may apply in Indianapolis, Fort Wayne, and other regulated communities
How Indiana Differs from Federal Requirements
- ⚠Indiana administers its own CSGP (INRA00000) under 327 IAC 15-5 rather than EPA's federal CGP.
- ⚠MyIDEM online filing is mandatory; no paper NOI option.
- ⚠The CSGP includes Indiana-specific BMP design standards that may differ from EPA CGP appendices.
SWPPP Tips for Indiana
- ➤Submit your NOI through MyIDEM well before the planned start date — IDEM processes NOIs in order received.
- ➤The CSGP requires the SWPPP to be updated when site conditions change; document all amendments.
- ➤In regulated MS4 communities (Indianapolis, Fort Wayne), verify local stormwater ordinance requirements before NOI submission.
Indiana SWPPP FAQs
What is Rule 5 in Indiana?+
Administrative rule 327 IAC 15-5 authorizes IDEM's Construction Stormwater General Permit (INRA00000). It establishes NOI, SWPPP, BMP, and inspection requirements for projects disturbing 1+ acre.
Can construction begin before IDEM processes the NOI?+
No. Indiana's CSGP (327 IAC 15-5) requires that NOI coverage be confirmed before any land disturbance begins. IDEM will notify the applicant when coverage is granted.
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