What is the largest wastewater treatment plant in New York?

Newtown Creek Water Pollution Control Plant in Brooklyn, treating an average of 187.2 MGD under NPDES permit NY0026204. NYC-DEP Wards Island WPCP in Manhattan is second at 182.4 MGD.

How much wastewater do New York’s largest plants treat?

The 50 largest plants treat 1,711 MGD combined, 89% of the flow reported by all 467 publicly owned plants in New York.

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 New York

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

Ranked by average flow · 1,711 MGD combined · 89% of the state's reported flow

Newtown Creek Water Pollution Control Plant in Brooklyn is the largest publicly owned wastewater treatment plant in New York by reported average flow, treating about 187.2 million gallons per day. The 50 plants below treat 1,711 MGD between them, 89% of the flow reported by all 467 plants in the state, and serve about 11,862,959 people. Every plant links to its profile with permit and compliance data. Treatment technology is shown with a free Klarifi account.

All plants in New York →The 50 largest US plants →New York NPDES permits →

The 50 largest publicly owned wastewater treatment plants in New York 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	Newtown Creek Water Pollution Control Plant	Brooklyn	187.2	1,109,558	NY0026204	Jun 2027	4
2	NYC-DEP Wards Island WPCP	Manhattan	182.4	1,102,853	NY0026131	Jun 2027	26
3	Hunts Point Water Pollution Control Plant	Bronx	123.8	711,199	NY0026191	Jun 2027	11
4	NYC-DEP North River WPCP	New York	107.6	611,675	NYR00E625	Dec 2030	2
5	Nycdep - Bowery Bay WRRF	Astoria	95.2	881,328	NY0026158	Jun 2027	8
6	Owls Head Water Pollution Control Plant	Brooklyn	88	787,493	NY0026166	Jun 2027	9
7	Coney Island Water Pollution Control Plant	Brooklyn	80.1	619,523	NY0026182	Jun 2027	8
8	Jamaica Water Pollution Control Plant	Jamaica	74.6	756,447	NY0026115	Jun 2027	11
9	Westchester Co Of - Yonkers Joint Waste Water Treatment Plant	Yonkers	65.64	495,659	NY0026689	May 2019	29
10	Cedar Creek WPCP	Wantagh	63.14	653,795	NY0026859	Jan 2026	12
11	Tallman Island Wastewater Treatment Plant	Queens	57.8	426,793	NY0026239	Jun 2027	2
12	Bay Park Sewage Treatment Plant	East Rockaway	48.73	584,105	NY0026450	Jan 2026	4
13	Albany County Sewer District - South Plant	Albany	43.24	101,989	NY0026867	Feb 2030	49
14	NYC DEP 26 Ward WPCP	Brooklyn	39.7	294,453	NY0026212	Jun 2027	12
15	Nycdep - Red Hook WPCP	Brooklyn	27.5	199,521	NY0027073	Jun 2027	2
16	Bergen Point STP & Bergen Ave Dock	W Babylon	27.44	400,000	NY0104809	Dec 2019	80
17	City Of Niagara Falls Wastewater Treatment Plant	Niagara Falls	27.15	48,252	NY0026336	Aug 2031	1
18	Nycdep - Oakwood Beach WPCP	Staten Island	26.56	254,445	NY0026174	Jun 2027	6
19	Binghamton-Johnson (c) Jnt STP	Vestal	26.42	45,140	NY0024414	Nov 2029	21
20	Port Richmond Water Pollution Control Plant	Staten Island	23	205,835	NY0026107	Jun 2027	2
21	Tonawanda (t) Sd#2 WWTP	Tonawanda	21.03	113,096	NY0026395	Jun 2019	8
22	Rensselaer County Sd#1 WWTP	Troy	20.34	77,294	NY0087971	May 2030	9
23	Jamestown WWTP	Jamestown	20.06	35,551	NY0027570	May 2020	183
24	Erie County Southtowns Sewage Treatment Plant	Buffalo	19.51	139,037	NY0095401	Sep 2031	61
25	New York (c) - Rockaway WPCP	Rockaway Park	18.8	93,993	NY0026221	Jun 2027	2
26	NW Quadrant Pure Waters Dist WWTP	Hilton	16.26	93,053	NY0028231	Jan 2019	2
27	Schenectady (c) STP	Schenectady	13.23	86,767	NY0020516	Dec 2025	4
28	Lockport (c) WWTP	Lockport	12.92	20,490	NY0027057	Aug 2017	14
29	Mamaroneck (v) Sanitary Sd	Mamaroneck	12.11	103,618	NY0026701	Mar 2013	1
30	New Rochelle STP	New Rochelle	11.16	86,009	NY0026697	Oct 2017	1
31	Watertown Pollution Control Plant	Watertown	9.41	30,315	NY0025984	Jan 2016	24
32	Auburn - C STP	Auburn	8.34	34,203	NY0021903	Apr 2031	7
33	Village Of Endicott Water Polution Control Plant	Endicott	7.76	44,977	NY0027669	Apr 2029	23
34	Amsterdam (c) WWTP	Amsterdam	7.72	20,071	NY0020290	Feb 2021	57
35	North Tonawanda Wastwater Treatment Facility	North Tonawanda	7.42	65,043	NY0026280	Nov 2023	27
36	City Of Poughkeepsie Water Pollution Control Plant	Poughkeepsie	7.39	56,147	NY0026255	Dec 2028	5
37	Newburgh (c) WWTP	Newburgh	6.73	60,222	NY0026310	May 2029	53
38	Rome Municipal STP	Rome	6.69	39,426	NY0030864	Sep 2024	38
39	Big Sister Creek WRRF	Angola	6.58	30,267	NYR00A952	Mar 2028	7
40	Plattsburgh (c) WPCP	Plattsburgh	6.49	26,140	NY0026018	Oct 2022	1
41	Orangetown Town Of Sewer Dept	Orangeburg	6.33	55,034	NY0026051	Jan 2022	7
42	Peekskill Wastewater Treatment Plant	Peekskill	6.29	48,428	NY0100803	Nov 2017	0
43	Oak Orchard WWTP	Clay	6.29	44,581	NY0030317	Apr 2031	0
44	Gloversville-Johnstown Joint WWTP	Johnstown	6.16	24,234	NY0026042	Feb 2022	14
45	Le Roy R Summerson WWTF	Cortland	5.66	22,881	NY0027561	Apr 2031	17
46	Ocsd#1 - Harriman Sewage Treatment Plant	Harriman	5.6	47,040	NYR00A935	Mar 2028	48
47	Batavia (c) STP	Batavia	5.32	16,162	NY0026514	Dec 2019	73
48	Middletown City Of Sewage Treatment Plt	Middletown	4.84	30,560	NY0026328	May 2017	1
49	Long Beach (c) WPCP	Long Beach	4.72	—	NY0020567	Aug 2019	88
50	Kingston (c) WWTP	Kingston	4.33	28,257	NY0029351	Nov 2021	14

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

Largest plants in New York: 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 · Biological nutrient removal · Tertiary treatment · 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. “Largest wastewater treatment plants in New York (2026).” Updated October 26, 2026. https://klarifi.io/facilities/new-york/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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