How many wastewater treatment plants are there in New Jersey?

Klarifi tracks 118 publicly owned wastewater treatment plants in New Jersey with a combined average flow of 496 million gallons per day, serving about 5,221,783 residents. 41 of them treat more than 1 MGD and 11 more than 10 MGD.

What is the largest wastewater treatment plant in New Jersey?

Middlesex County Utilities Authority in Sayreville is the largest plant in New Jersey by average flow, treating about 87.51 MGD.

What treatment technologies are common in New Jersey?

9 of New Jersey's plants use lagoon systems and 32 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in New Jersey are up for renewal?

18 permits held by New Jersey plants expire in 2026 and 32 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater treatment plants in New Jersey

Name: Wastewater treatment plants in New Jersey
Creator: Klarifi
License: https://klarifi.io/terms-of-service

118 facilities · 496 MGD combined flow

Klarifi tracks 118 publicly owned wastewater treatment plants in New Jersey with a combined average flow of 496 MGD, serving about 5,221,783 residents. 41 plants treat more than 1 MGD and 11 more than 10 MGD; 9 use lagoon systems and 32 have digesters or biogas infrastructure. The largest is Middlesex County Utilities Authority in Sayreville at 87.51 MGD. 18 NPDES permits expire this year and 32 next year.

Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account.

118 plant locations in New Jersey; dot size follows average flow. Boundaries: U.S. Census Bureau.

NPDES permits and renewals in New Jersey

Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.

All NPDES permits in New Jersey →18 permits expiring in 2026 →32 permits expiring in 2027 →9 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in New Jersey

The 10 largest publicly owned wastewater treatment plants in New Jersey by average flow, with NPDES permit, expiry and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Violations (3y)
Middlesex County Utilities Authority	Sayreville	87.51	147	NJ0020141	Jun 2020	21
Bergen County Utilities Authority	Little Ferry	70	94	NJ0020028	Mar 2030	178
Essex & Union Cnty Joint Meeting STP	Elizabeth	50.33	220	NJ0024741	Mar 2030	145
Delaware #1 Water Pollution Control Facility	Camden	46.41	185	NJ0026182	Dec 2029	6
Atlantic County Utilities Authority POTW	Atlantic City	24.37	—	NJL024473	Dec 2030	0
Ocean Cnty Util Auth Nwpcf	Bricktown	22.38	32	NJ0028142	Mar 2026	0
Ocean Cnty Util Auth Cwpcf	Bayville	17.97	—	NJL029408	Dec 2030	0
Somerset Raritian Valley Sewerage	Bridgewater	16.4	23	NJ0024864	Nov 2030	12
Gloucester Cnty Util Auth STP	West Deptford Twp	15.52	—	NJ0024686	Dec 2026	15
Monmouth Cnty Bayshore Outfall Auth Belford Pump Station	Belford	13.96	33	NJ0024694	Sep 2026	3

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

The 50 largest plants in New Jersey →EPA enforcement actions in New Jersey →New Jersey capital improvement plans →

New Jersey plants by treatment technology

Activated sludge and clarifiers (59)Anaerobic digesters and biogas (32)Oxidation ditches (15)Lagoon systems (9)

All 118 plants in New Jersey

Facility	City	Flow (MGD)
Middlesex County Utilities Authority	Sayreville	87.51
Bergen County Utilities Authority	Little Ferry	70
Essex & Union Cnty Joint Meeting STP	Elizabeth	50.33
Delaware #1 Water Pollution Control Facility	Camden	46.41
Atlantic County Utilities Authority POTW	Atlantic City	24.37
Ocean Cnty Util Auth Nwpcf	Bricktown	22.38
Ocean Cnty Util Auth Cwpcf	Bayville	17.97
Somerset Raritian Valley Sewerage	Bridgewater	16.4
Gloucester Cnty Util Auth STP	West Deptford Twp	15.52
Monmouth Cnty Bayshore Outfall Auth Belford Pump Station	Belford	13.96
North Hudson Sewerage Auth WWTP	Hoboken	11.73
Rockaway Valley Reg Sa	Boonton	9.87
Trenton City DPW Sewer Auth	Trenton	9.28
Par Troy Hills Twp MUA WWTP @ Whippany River	Parsippany	8.44
Middletown Twp Slf Belford Section	Middletown	7.43
Ewing Lawrence Sewer Auth	Lawrenceville	7.31
Township Of Wayne	Wayne	6.88
Pine Brook STP	Manalapan	5.82
Two Bridges Wastewater Treatment Plant	Lincoln Park	5.07
Bergen County Utilities Authority	Edgewater	3.44
Willingboro Water Pollution Control Plant	Willingboro	3.17
Morristown Sewer Utility	Morristown	3.04
North Bergen Twp MUA Woodcliff STP	North Bergen	2.54
East Windsor Water Pollution Control Plant	East Windsor	2.53
Cape May Cnty MUA 7 Mile Beach Middle Rgnl Wtf	Cape May Court House	2.46
Long Branch City Sewer Auth	Long Branch	2.37
Musconetcong Sewer Auth Water Pollution Control Facility	Budd Lake	2.3
Maple Shade Twp Util Auth Park Avenue POTW	Maple Shade	2.11
Molitor Water Pollution Control Facility	Chatham	2.09
Asbury Park Water Quality Central Facility	Asbury Park	2.05
Cape May Cnty MUA Ocean City WWTP	Ocean City	1.96
Delran Sewerage Authority	Delran	1.9
Elmwood WTP	Marlton	1.83
New Providence Boro DPW Complex WWTP	New Providence	1.79
Logan Township MUA	Bridgeport	1.58
Pemberton Twp MUA	Pemberton	1.5
Berkeley Heights WPCF	Berkeley Heights	1.47
Sussex Cnty MUA Upper Wallkill Valley Water Pollution Control Facility	Hamburg	1.38
Roxbury Twp MUA Ajax WTP	Succasunna	1.35
Cinnaminson Twp Sewerage Auth	Cinnaminson	1.31
Long Hill Township STP	Stirling	1.05
Cape May Regional Wtf	Cape May Point	0.98
Wanaque Valley Rgnl Sewer Auth Treatment Plant	Wanaque	0.82
Newton Town DPW	Newton	0.81
Chatham Twp DPW Main STP Water Pollution Control Plant	Chatham	0.76
Lambertville City Sewer Auth	Lambertville	0.68
Readington Lebanon Sewer Auth	Whitehouse	0.66
Ac Wagner Youth Corr Fac	Chesterfield	0.65
Montgomery Twp MUA Pike Brook STP	Montgomery	0.56
Warren Twp Sewer Auth Stage 4 WWTP	Warren	0.56
Greenwich Twp STP	Gibbstown	0.52
Bernardsville Boro	Bernardsville	0.48
Beverly Sewerage Authority	Beverly	0.43
Stage Ii Treatment Plant	Montgomery	0.43
Palmyra Boro Municipal Building	Palmyra	0.39
Woodstown Boro Water Dept	Woodstown	0.37
Schooley'S Mountain Wastewater Treatment Plan	Long Valley	0.34
Warren Cnty MUA Belvidere Area WWTF	Belvidere	0.31
Warren Twp Sewerage Authority	Warren	0.31
Harrison Township Treatment Pl	Mullica Hill	0.31
Njdoc - Bayside State Prison	Leesburg	0.29
Hightstown Boro AWWTP	Hightstown	0.28
Penns Grove Sewerage Authority	Penns Grove	0.28
Buena Borough MUA Cs-Septics	Buena	0.27
Medford Lakes Borough STP	Medford Lakes	0.26
Oxford Township Warren Co-Pequest MUA - Cs/stp/septics	Oxford	0.24
Greystone Park Psych Hospital	Greystone Park	0.23
Swedesboro Boro MUA WWTP	Swedesboro	0.21
Stony Brook Rgnl Sewerage Auth	Hopewell	0.19
Milford Boro Sewer Auth	Milford	0.18
Montgomery Twp MUA Cherry Valley STP	Skillman	0.16
Allentown STP	Allentown	0.14
Washington Twp MUA Long Valley	Long Valley	0.13
No Princeton Developmental Ctr	Skillman	0.13
Frenchtown Wastewater Treatment Plant	Frenchtown	0.13
Riverton STP	Riverton	0.12
Warren Twp Sewer Auth Stage 5 STP	Warren	0.12
Plumsted MUA WWTP	Plumsted Twp	0.11
Roosevelt Boro MUA WWTP	Millstone Township	0.11
Olde Milford Estates STP	West Milford	0.08
Suez Water Nj Highview Acres WWTP	West Milford	0.06
Mercer County Correction Ctr WTP	Hopewell Twp	0.06
Wrightstown MUA-Martha Ave WTP	Wrightstown	0.05
Fieldsboro Boro Sewer Dept WWTP	Fieldsboro	0.04
Suez Water Nj Awosting WWTP	Hewitt	0.03
Njdoc Mountainview Youth Correctional Facility	Annandale	0.03
Delaware Township MUA	Sergeantsville	0.03
Sussex Cnty MUA Hampton Commons STP	Newton	0.02
Hancocks Bridge STP	Hancocks Bridge	0.02
Suez Water Nj Crescent Park WWTP	West Milford	0.02
Njdhs Senator Garrett Hagedorn Psyciatric Hospital	Glen Gardner	0.01
Lounsberry Hollow Middle Sch STP	Vernon Twp	0.0085
North Warren Regional School	Blairstown Twp	0.0084
Kittatinny Reg Hs/marion Mckeown School	Newton	0.0047
Sparta Alpine School	Sparta	0.0044
Alexandria Middle School	Pittstown	0.0042
Jefferson Twp High-Middle School	Jefferson Twp	0.0039
Sussex County Homestead WTP	Frankford	0.0037
High Point Regional Hs	Wantage Twp	0.0028
Holmdel Twp Bd Of Ed Holmdel Village School STP	Holmdel	0.0028
Ramapo Indian Hills Rgnl Sd Indian Hills High School WTP	Oakland	0.0027
Long Pond School WWTF	Newton	0.0019
Warren Co Technical School STP	Washington	0.0017
Clinton Twp Bd Of Ed Round Valley School	Lebanon	0.0015
Springfield Twp Bd Of Ed Elementary School	Jobstown	0.0014
Arthur Stanlick School	Jefferson	0.001
Union Twp School	Hampton	0.00099
Stonybrook School	Kinnelon	0.00073
Robert Erskine School STP	Ringwood	0.0006
Lester D. Wilson Elem School	Pittstown	0.00032
Helen A Fort Middle School	Pemberton Twp	0.00023
Allamuchy Stp, Township Of	Great Meadows	—
Cloverhill STP	Flanders	—
Ringwood Acres Treatment Plant	Ringwood	—
River Road WWTP	West New York	—
Washington Boro WWTP	Washington	—
White Rock STP	Jefferson Twp	—
Wildwood/lower Region Wtf	Rio Grande	—

Wastewater treatment in New Jersey: 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 · Anaerobic digester · Lift station · 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. “Wastewater treatment plants in New Jersey.” Updated October 26, 2026. https://klarifi.io/facilities/new-jersey

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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