What is the largest wastewater treatment plant in Indiana?

Indianapolis Belmont WWTP in Indianapolis, treating an average of 105.33 MGD under NPDES permit IN0023183. Water Pollution Control Plant in Fort Wayne is second at 44.71 MGD.

How much wastewater do Indiana’s largest plants treat?

The 50 largest plants treat 500 MGD combined, 81% of the flow reported by all 434 publicly owned plants in Indiana.

How is plant size measured?

By reported average daily flow in million gallons per day (MGD) from EPA discharge monitoring reports, the standard measure of a plant’s size. Design capacity, the flow a plant is permitted to treat, is usually higher and is shown on each profile.

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The 50 largest wastewater treatment plants in Indiana

Name: Largest wastewater treatment plants in Indiana
Creator: Klarifi
License: https://klarifi.io/terms-of-service

Ranked by average flow · 500 MGD combined · 81% of the state's reported flow

Indianapolis Belmont WWTP in Indianapolis is the largest publicly owned wastewater treatment plant in Indiana by reported average flow, treating about 105.33 million gallons per day. The 50 plants below treat 500 MGD between them, 81% of the flow reported by all 434 plants in the state, and serve about 3,051,236 people. Every plant links to its profile with permit and compliance data. Treatment technology is shown with a free Klarifi account.

All plants in Indiana →The 50 largest US plants →Indiana NPDES permits →

The 50 largest publicly owned wastewater treatment plants in Indiana by average flow (MGD), with population served, NPDES permit, expiry and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Violations (3y)
1	Indianapolis Belmont WWTP	Indianapolis	105.33	959,530	IN0023183	May 2029	117
2	Water Pollution Control Plant	Fort Wayne	44.71	312,389	IN0032191	Sep 2031	2
3	Gary Sanitary District	Gary	42.04	195,005	IN0022977	Jun 2027	23
4	Saniatry District Of Hammond	Hammond	34.49	156,645	IN0023060	Apr 2027	21
5	Lafayette WWTP	Lafayette	18	60,293	IN0032468	Jul 2028	0
6	Muncie Water Pollution Control Facility	Muncie	17.5	90,357	IN0025631	Jun 2029	0
7	Mishawaka Wastewater Treatment Plant	Mishawaka	12.29	49,515	IN0025640	Apr 2027	2
8	Evansville Westside WWTP	Evansville	11.68	56,737	IN0032956	Jan 2027	6
9	Dillman Waste Water Treatment Plant	Bloomington	11.49	56,248	IN0035718	Aug 2029	7
10	Anderson WWTP	Anderson	10.46	76,420	IN0032476	Sep 2030	9
11	City Of Kokomo Waste Water Treatment Facility	Kokomo	9.93	62,625	IN0032875	Nov 2026	21
12	East Chicago Sanitary District	East Chicago	9.42	35,382	IN0022829	Jun 2026	41
13	Columbus Wwtp, City Of	Columbus	8.15	43,388	IN0032573	Mar 2030	4
14	West Lafayette WWTP	West Lafayette	8.01	36,658	IN0024821	Jan 2031	11
15	New Albany WWTP	New Albany	7.82	41,820	IN0023884	May 2027	14
16	Carmel WWTP	Indianapolis	7.69	79,831	IN0022497	Nov 2028	2
17	Fishers Cheeney Creek WWTP	Fishers	7.56	31,708	IN0055484	Oct 2027	2
18	Richmond Wwtp, City Of	Richmond	6.8	47,198	IN0025615	Feb 2031	13
19	Schererville WWTP	Schererville	6.55	49,949	IN0024457	Jul 2028	8
20	Kendallville WWTP	Kendallville	6.42	10,054	IN0020656	Jun 2031	96
21	Noblesville Wwtp, City Of	Noblesville	6.39	29,891	IN0020168	May 2031	2
22	Shelbyville Wwtp, City Of	Shelbyville	6.11	18,819	IN0032867	Mar 2031	24
23	Elden Kuehl Pollution Control Facility	Valparaiso	5.77	31,176	IN0024660	Sep 2027	3
24	Jeffersonville Municipal WWTP	Jeffersonville	5.13	33,543	IN0023302	Feb 2031	9
25	Huntington WWTP	Huntington	4.95	18,823	IN0023132	May 2028	9
26	Franklin Wwtp, City Of	Franklin	4.65	23,657	IN0021181	Aug 2027	14
27	Seymour Wastewater Treatment Facility	Seymour	4.59	19,874	IN0024473	Apr 2031	22
28	New Castle WWTP	New Castle	4.53	22,221	IN0023914	Jul 2031	37
29	Portage Utility Service Facility WWTP	Portage	4.21	33,744	IN0024368	Aug 2030	4
30	Citizens Wastewater Of Westfield Llc Plant Capacity Expansion	Westfield	4.02	9,900	IN0059544	May 2027	5
31	Crown Point 2021 Wastewater Utility Improvements Divisions A And C	Crown Point	3.93	18,535	IN0025763	Jun 2030	22
32	City Of La Porte - Wastewater Treatment Plant	La Porte	3.91	22,675	IN0025577	Feb 2030	39
33	South Dearborn Rsd	Lawrenceburg	3.67	18,710	IN0024538	Feb 2031	10
34	Peru Utilities WWTP	Peru	3.54	14,662	IN0032328	Nov 2030	23
35	Frankfort Wwtp, City Of	Frankfort	3.53	17,420	IN0022934	Apr 2030	7
36	Greenfield Wastewater Treatment Plant Improvements	Greenfield	3.43	19,237	IN0020109	Nov 2029	55
37	Goshen City Waste Water Treatment Plant Improvements	Goshen	3.42	30,720	IN0025755	Jun 2031	13
38	Elwood Wwtp, City Of	Elwood	3.3	8,410	IN0032719	Jan 2031	26
39	Vincennes Wastewater Treatment Facility	Vincennes	3.24	21,471	IN0031020	Oct 2029	0
40	Warsaw WWTP	Warsaw	3.23	20,053	IN0060917	May 2027	6
41	Washington WWTP	Washington	3.2	16,233	IN0025658	Jun 2028	130
42	Newburgh WWTP	Newburgh	3.17	38,083	IN0023892	Mar 2031	2
43	Boonville WWTP	Boonville	3.13	6,987	IN0022420	Nov 2027	11
44	Brownsburg WWTP	Brownsburg	2.86	21,956	IN0021245	Sep 2030	8
45	Lebanon WWTP	Lebanon	2.86	17,106	IN0020818	Mar 2030	2
46	Chesterton WWTP	Chesterton	2.64	16,435	IN0022578	Oct 2029	0
47	Nappanee Wwtp, City Of	Nappanee	2.57	6,949	IN0021466	Feb 2030	2
48	Columbia City Water Department	Columbia City	2.48	9,892	IN0022624	Dec 2027	47
49	Plainfield North Water Pollution Control Facility	Plainfield	2.4	19,233	IN0021202	Apr 2028	11
50	Bedford Wastewater Treatment Plant	Bedford	2.39	13,069	IN0025623	Dec 2028	4

Treatment technology for each plant is shown with a free Klarifi account. Create one →

Largest plants 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 October 26, 2026.

Wastewater terms: WWTP · POTW · MGD · NPDES permit · Activated sludge · Oxidation ditch · all terms

Cite this page

Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “The 50 largest wastewater treatment plants in Indiana (2026).” Updated October 26, 2026. https://klarifi.io/facilities/indiana/largest

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

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