What is the largest wastewater treatment plant in Indiana?

Indianapolis Belmont WWTP in Indianapolis, treating an average of 83.83 MGD under NPDES permit IN0023183. Gary Sanitary District in Gary is second at 32.6 MGD.

How much wastewater do Indiana’s largest plants treat?

The 50 largest plants treat 422 MGD combined, 84% of the flow reported by all 432 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 · 422 MGD combined · 84% 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 83.83 million gallons per day. The 50 plants below treat 422 MGD between them, 84% of the flow reported by all 432 plants in the state, and serve about 3,241,867 people. Every plant links to its profile with permit, technology and compliance data.

All plants in Indiana →The 100 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, treatment technology and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Technology	Violations (3y)
1	Indianapolis Belmont WWTP	Indianapolis	83.83	959,530	IN0023183	May 2029	Biogas balloons	116
2	Gary Sanitary District	Gary	32.6	195,005	IN0022977	Jun 2027	Clarifiers, Biogas silos, Biogas balloons	24
3	Water Pollution Control Plant	Fort Wayne	29.9	312,389	IN0032191	Feb 2026	Clarifiers, Biogas silos, Biogas balloons	2
4	Saniatry District Of Hammond	Hammond	25.83	156,645	IN0023060	Apr 2027	Clarifiers, Uncovered lagoons, Biogas silos	21
5	City Of South Bend Wastewater Treatment Plant	South Bend	23.29	132,344	IN0024520	Nov 2026	Clarifiers, Biogas silos, Biogas balloons	4
6	Lafayette WWTP	Lafayette	15.2	60,293	IN0032468	Jul 2028	Clarifiers, Uncovered lagoons, Biogas silos	0
7	East Chicago Sanitary District	East Chicago	13.24	35,382	IN0022829	Jun 2026	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	44
8	Muncie Water Pollution Control Facility	Muncie	12.2	90,357	IN0025631	Jun 2029	Clarifiers, Biogas silos	0
9	Evansville Westside WWTP	Evansville	10.6	56,737	IN0032956	Jan 2027	Clarifiers, Biogas silos	10
10	Eastside Wastewater Treatment Plant	Evansville	9.8	67,235	IN0033073	Jan 2027	Clarifiers, Biogas silos	13
11	Mishawaka Wastewater Treatment Plant	Mishawaka	9.43	49,515	IN0025640	Apr 2027	Clarifiers, Biogas silos	2
12	Elkhart Public Works And Utilities	Elkhart	9.19	59,250	IN0025674	Apr 2027	Clarifiers, Biogas silos, Biogas balloons	179
13	Dillman Waste Water Treatment Plant	Bloomington	8.64	56,248	IN0035718	Aug 2029	Uncovered lagoons	7
14	West Lafayette WWTP	West Lafayette	7.9	36,658	IN0024821	Jan 2031	Clarifiers, Biogas silos	10
15	Carmel WWTP	Indianapolis	7.22	79,831	IN0022497	Nov 2028	—	0
16	Anderson WWTP	Anderson	7	76,420	IN0032476	Sep 2030	Clarifiers, Biogas balloons	11
17	Columbus Wwtp, City Of	Columbus	6.92	43,388	IN0032573	Mar 2030	—	4
18	Fishers Cheeney Creek WWTP	Fishers	6.9	31,708	IN0055484	Oct 2027	Clarifiers	2
19	Noblesville Wwtp, City Of	Noblesville	6.05	29,891	IN0020168	May 2031	Clarifiers, Biogas silos	2
20	City Of Kokomo Waste Water Treatment Facility	Kokomo	5.96	62,625	IN0032875	Nov 2026	Clarifiers, Uncovered lagoons	19
21	New Albany WWTP	New Albany	5.41	41,820	IN0023884	May 2027	Clarifiers, Carrousels / oxidation ditches	14
22	Schererville WWTP	Schererville	4.75	49,949	IN0024457	Jul 2028	Clarifiers, Biogas silos	8
23	Jeffersonville Municipal WWTP	Jeffersonville	4.48	33,543	IN0023302	Feb 2031	Clarifiers, Carrousels / oxidation ditches	9
24	Elden Kuehl Pollution Control Facility	Valparaiso	4.41	31,176	IN0024660	Sep 2027	Clarifiers, Biogas silos	3
25	Richmond Wwtp, City Of	Richmond	3.96	47,198	IN0025615	Feb 2031	Clarifiers, Biogas silos	14
26	Shelbyville Wwtp, City Of	Shelbyville	3.81	18,819	IN0032867	Mar 2031	Clarifiers, Biogas silos, Biogas balloons	24
27	City Of La Porte - Wastewater Treatment Plant	La Porte	3.47	22,675	IN0025577	Feb 2030	Clarifiers, Uncovered lagoons, Biogas silos, Biogas balloons	39
28	Citizens Wastewater Of Westfield Llc Plant Capacity Expansion	Westfield	3.4	9,900	IN0059544	May 2027	—	5
29	Portage Utility Service Facility WWTP	Portage	3.33	33,744	IN0024368	Aug 2030	Clarifiers, Carrousels / oxidation ditches	4
30	Goshen City Waste Water Treatment Plant Improvements	Goshen	3.1	30,720	IN0025755	Jun 2031	Clarifiers, Biogas balloons	13
31	Franklin Wwtp, City Of	Franklin	3.07	23,657	IN0021181	Aug 2027	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	18
32	Seymour Wastewater Treatment Facility	Seymour	3.02	19,874	IN0024473	Apr 2031	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	22
33	Nappanee Wwtp, City Of	Nappanee	3	6,949	IN0021466	Feb 2030	Clarifiers, Biogas silos	1
34	Peru Utilities WWTP	Peru	2.92	14,662	IN0032328	Nov 2030	Clarifiers, Uncovered lagoons	24
35	Warsaw WWTP	Warsaw	2.9	20,053	IN0060917	May 2027	Clarifiers, Carrousels / oxidation ditches, Biogas silos	6
36	South Dearborn Rsd	Lawrenceburg	2.83	18,710	IN0024538	Feb 2031	Clarifiers, Biogas silos	11
37	Boonville WWTP	Boonville	2.7	6,987	IN0022420	Nov 2027	Clarifiers	12
38	Greenfield Wastewater Treatment Plant Improvements	Greenfield	2.7	19,237	IN0020109	Nov 2029	Clarifiers, Biogas silos, Biogas balloons	56
39	Vincennes Wastewater Treatment Facility	Vincennes	2.68	21,471	IN0031020	Oct 2029	Clarifiers, Biogas silos	0
40	New Castle WWTP	New Castle	2.66	22,221	IN0023914	Jul 2031	Clarifiers, Uncovered lagoons, Biogas silos	37
41	Crown Point 2021 Wastewater Utility Improvements Divisions A And C	Crown Point	2.5	18,535	IN0025763	Jun 2030	Clarifiers, Biogas silos	20
42	Washington WWTP	Washington	2.46	16,233	IN0025658	Jun 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	132
43	Brownsburg WWTP	Brownsburg	2.24	21,956	IN0021245	Sep 2030	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	8
44	Chesterton WWTP	Chesterton	2.21	16,435	IN0022578	Oct 2029	Clarifiers, Biogas silos	0
45	Town Of Clarksville Public Works Facility	Clarksville	2.2	21,956	IN0047058	Jun 2028	Clarifiers, Carrousels / oxidation ditches, Biogas silos	1
46	Frankfort Wwtp, City Of	Frankfort	2.13	17,420	IN0022934	Apr 2030	Clarifiers, Aerated lagoons, Biogas silos	7
47	West Central Conservancy Dist	Avon	2.09	11,000	IN0051632	Jun 2031	Carrousels / oxidation ditches	19
48	Elwood Wwtp, City Of	Elwood	2.06	8,410	IN0032719	Jan 2031	Clarifiers	27
49	Lebanon WWTP	Lebanon	2.04	17,106	IN0020818	Mar 2030	Clarifiers, Carrousels / oxidation ditches	2
50	Hendricks County Rsd	Avon	1.82	8,000	IN0057614	Aug 2029	Clarifiers	11

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 September 11, 2026.

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