Indiana NPDES permit search
Status, expiry and violations for 434 municipal wastewater permits · issued by IDEM
In short
How do I look up an NPDES permit in Indiana?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search IDEM’s Virtual File Cabinet or IDEM’s list of NPDES permits. EPA’s ECHO database shows the monitoring results and violations of every permit. The 5,311 industrial permits in Indiana are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
426
Administratively continued
5
Expired
1
Plants with effluent violations, 3 years
353
Where to find official Indiana NPDES records
Indiana Department of Environmental Management (IDEM) runs the NPDES program in Indiana under authorization from EPA Region 5. It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. IDEM website ↗
permits · permit documents · applications · inspections
IDEM’s document archive. Use Facility Search with part of the name or address to find the site’s Agency Interest ID, list its documents and narrow by program or document type; IDEM’s permit notices also give the document ID of the final permit.
permits
Open “List of NPDES Permits [XLSX]” on IDEM’s wastewater permitting page and search its first tab for the facility name or permit number.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Permit numbers
- Permits follow EPA’s format (IN0000108); IDEM files documents under an Agency Interest ID for each site.
- Discharge monitoring reports
- Through EPA’s NetDMR; IDEM accepts no paper DMRs.
- Violations and enforcement
- IDEM’s notices of violation and orders ↗
Industrial and commercial NPDES permits in Indiana
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 5,311 individual permits in force for industrial and commercial facilities in Indiana (manufacturers, food processors, mines, power plants, landfills), 223 of them major dischargers, plus 821 facilities covered by a general permit, mostly for stormwater. 549 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 5,311 industrial permits in Indiana
Search every industrial and commercial discharger in Indiana by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Indiana: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Indiana wastewater plants
353 of the 434 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 392 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 53 formal cases naming Indiana wastewater plants, 4 of them since fiscal year 2020, with $4.4 million in penalties assessed. Enforcement cases in Indiana →
Permit renewals by year
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
2029: 93 permits
2030: 87 permits
2031: 72 permits
Largest permit holders in Indiana
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Water Pollution Control Plant | Fort Wayne | 44.71 | 74 | IN0032191 | Administratively continued | Feb 2026 | 2 |
| Gary Sanitary District | Gary | 42.04 | 60 | IN0022977 | Effective | Jun 2027 | 23 |
| Saniatry District Of Hammond | Hammond | 34.49 | 37.8 | IN0023060 | Effective | Apr 2027 | 21 |
| Lafayette WWTP | Lafayette | 18 | 33 | IN0032468 | Effective | Jul 2028 | 0 |
| Muncie Water Pollution Control Facility | Muncie | 17.5 | 24 | IN0025631 | Effective | Jun 2029 | 0 |
| City Of Kokomo Waste Water Treatment Facility | Kokomo | 9.93 | 23.5 | IN0032875 | Effective | Nov 2026 | 21 |
| Evansville Westside WWTP | Evansville | 11.68 | 21.7 | IN0032956 | Effective | Jan 2027 | 6 |
| Anderson WWTP | Anderson | 10.46 | 21.25 | IN0032476 | Effective | Sep 2030 | 9 |
| Elkhart Public Works And Utilities | Elkhart | 14.03 | 20 | IN0025674 | Effective | Apr 2027 | 179 |
| Mishawaka Wastewater Treatment Plant | Mishawaka | 12.29 | 20 | IN0025640 | Effective | Apr 2027 | 2 |
Indiana NPDES permits: questions
NPDES permit search in other states
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · Oxidation ditch · Anaerobic digester · all terms