Who issues NPDES permits in Indiana?

Indiana Department of Environmental Management issues and enforces NPDES permits for wastewater discharges in Indiana. Klarifi tracks 432 permits held by publicly owned treatment plants in the state.

How many NPDES permits in Indiana are expired or administratively continued?

5 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 0 are recorded as expired, out of 432 permits tracked. 425 are effective.

How many Indiana wastewater permits come up for renewal soon?

25 in 2026, 70 in 2027 and 91 in 2028. Each year has its own renewal calendar with the plants listed.

How do I look up an NPDES permit number?

Enter the permit number (two letters and seven characters, for example TX0021873) or the plant name in the lookup on the NPDES page; each result opens the plant profile with status, expiry, design flow and the three-year violation count.

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NPDES permits in Indiana

Name: NPDES permits held by wastewater treatment plants in Indiana
Creator: Klarifi
License: https://klarifi.io/terms-of-service

432 permits held by publicly owned wastewater treatment plants · issued by IDEM

Effective

425

Administratively continued

Expired

Total tracked

432

Indiana Department of Environmental Management (IDEM) runs the NPDES program in Indiana under delegation from EPA Region 5, issuing and enforcing the discharge permits listed here. Klarifi tracks 432 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →

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.

Permit renewals by year

2026: 25 permits →2027: 70 permits →2028: 91 permits →

2029: 94 permits

2030: 88 permits

2031: 64 permits

Largest permit holders in Indiana

The 25 largest publicly owned wastewater treatment plants in Indiana by permitted design flow, with NPDES permit number, status and expiry. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Status	Expires	Violations (3y)
Indianapolis Belmont WWTP	Indianapolis	83.83	125	IN0023183	Effective	May 2029	116
Water Pollution Control Plant	Fort Wayne	29.9	74	IN0032191	Administratively continued	Feb 2026	2
Gary Sanitary District	Gary	32.6	60	IN0022977	Effective	Jun 2027	24
City Of South Bend Wastewater Treatment Plant	South Bend	23.29	48	IN0024520	Effective	Nov 2026	4
Saniatry District Of Hammond	Hammond	25.83	37.8	IN0023060	Effective	Apr 2027	21
Lafayette WWTP	Lafayette	15.2	33	IN0032468	Effective	Jul 2028	0
Muncie Water Pollution Control Facility	Muncie	12.2	24	IN0025631	Effective	Jun 2029	0
City Of Kokomo Waste Water Treatment Facility	Kokomo	5.96	23.5	IN0032875	Effective	Nov 2026	19
Evansville Westside WWTP	Evansville	10.6	21.7	IN0032956	Effective	Jan 2027	10
Anderson WWTP	Anderson	7	21.25	IN0032476	Effective	Sep 2030	11
Elkhart Public Works And Utilities	Elkhart	9.19	20	IN0025674	Effective	Apr 2027	179
Mishawaka Wastewater Treatment Plant	Mishawaka	9.43	20	IN0025640	Effective	Apr 2027	2
Eastside Wastewater Treatment Plant	Evansville	9.8	18	IN0033073	Effective	Jan 2027	13
Richmond Wwtp, City Of	Richmond	3.96	18	IN0025615	Effective	Feb 2031	14
Dillman Waste Water Treatment Plant	Bloomington	8.64	15	IN0035718	Effective	Aug 2029	7
East Chicago Sanitary District	East Chicago	13.24	15	IN0022829	Administratively continued	Jun 2026	44
Carmel WWTP	Indianapolis	7.22	14	IN0022497	Effective	Nov 2028	0
Columbus Wwtp, City Of	Columbus	6.92	14	IN0032573	Effective	Mar 2030	4
New Albany WWTP	New Albany	5.41	12	IN0023884	Effective	May 2027	14
West Lafayette WWTP	West Lafayette	7.9	10.5	IN0024821	Effective	Jan 2031	10
City Of Madison, POTW	Madison	1.39	10.2	IN0025666	Effective	Nov 2026	0
Fishers Cheeney Creek WWTP	Fishers	6.9	10	IN0055484	Effective	Oct 2027	2
New Castle WWTP	New Castle	2.66	10	IN0023914	Effective	Jul 2031	37
Noblesville Wwtp, City Of	Noblesville	6.05	10	IN0020168	Effective	May 2031	2
Frankfort Wwtp, City Of	Frankfort	2.13	9	IN0022934	Effective	Apr 2030	7

All 432 plants in Indiana →

NPDES permits in Indiana: questions

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 September 11, 2026.

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