How many wastewater treatment plants are there in New Jersey?

Klarifi tracks 122 publicly owned wastewater treatment plants in New Jersey with a combined average flow of 480 million gallons per day, serving about 5,459,974 residents. 44 of them treat more than 1 MGD and 12 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 77.42 MGD.

What treatment technologies are common in New Jersey?

20 of New Jersey's plants use lagoon systems and 34 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

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

20 permits held by New Jersey plants expire in 2026 and 33 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

122 facilities · 480 MGD combined flow

Klarifi tracks 122 publicly owned wastewater treatment plants in New Jersey with a combined average flow of 480 MGD, serving about 5,459,974 residents. 44 plants treat more than 1 MGD and 12 more than 10 MGD; 20 use lagoon systems and 34 have digesters or biogas infrastructure. The largest is Middlesex County Utilities Authority in Sayreville at 77.42 MGD. 20 NPDES permits expire this year and 33 next year.

Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city.

122 plant locations in New Jersey; dot size follows average flow.

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 →20 permits expiring in 2026 →33 permits expiring in 2027 →10 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in New Jersey

The 25 largest publicly owned wastewater treatment plants in New Jersey by average flow, with NPDES permit, expiry, treatment technology and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Middlesex County Utilities Authority	Sayreville	77.42	147	NJ0020141	Jun 2020	Clarifiers, Uncovered lagoons, Biogas silos	17
Bergen County Utilities Authority	Little Ferry	63.2	94	NJ0020028	Mar 2030	Clarifiers, Uncovered lagoons, Biogas silos	176
Essex & Union Cnty Joint Meeting STP	Elizabeth	44.93	220	NJ0024741	Mar 2030	Clarifiers, Carrousels / oxidation ditches, Biogas silos	145
Delaware #1 Water Pollution Control Facility	Camden	43.19	185	NJ0026182	Dec 2029	Biogas silos, Biogas balloons	6
Atlantic County Utilities Authority POTW	Atlantic City	24.52	—	NJL024473	Dec 2030	Clarifiers, Uncovered lagoons, Biogas silos	0
Ocean Cnty Util Auth Nwpcf	Bricktown	22.16	32	NJ0028142	Mar 2026	Clarifiers, Biogas silos, Biogas balloons	0
Rahway Valley Sewerage Authority	Rahway	19.3	—	NJL024643	Dec 2030	Clarifiers, Biogas silos, Biogas balloons	77
Ocean Cnty Util Auth Cwpcf	Bayville	17.6	—	NJL029408	Dec 2030	Clarifiers, Biogas silos, Biogas balloons	0
Gloucester Cnty Util Auth STP	West Deptford Twp	15.16	—	NJ0024686	Dec 2026	Clarifiers, Biogas silos	15
Somerset Raritian Valley Sewerage	Bridgewater	12.98	23	NJ0024864	Nov 2030	Clarifiers	9
Monmouth Cnty Bayshore Outfall Auth Belford Pump Station	Belford	12.8	33	NJ0024694	Sep 2026	Clarifiers, Biogas silos	3
North Hudson Sewerage Auth WWTP	Hoboken	11.5	20.8	NJ0026085	Mar 2029	Clarifiers, Biogas balloons	0
Trenton City DPW Sewer Auth	Trenton	9.42	20	NJ0020923	Mar 2026	—	127
Rockaway Valley Reg Sa	Boonton	9.09	12	NJ0022349	Sep 2024	Clarifiers, Carrousels / oxidation ditches	117
Par Troy Hills Twp MUA WWTP @ Whippany River	Parsippany	7.98	—	NJG124753	Jan 2028	Clarifiers, Biogas silos	88
Middletown Twp Slf Belford Section	Middletown	7.01	10.8	NJ0025356	Dec 2025	Clarifiers, Aerated lagoons, Biogas silos	4
Pine Brook STP	Manalapan	5.83	8.8	NJ0023728	Sep 2026	Clarifiers, Biogas silos, Biogas balloons	0
Township Of Wayne	Wayne	5.72	13.5	NJ0028002	Mar 2026	Clarifiers	38
Ewing Lawrence Sewer Auth	Lawrenceville	5.5	—	NJ0024759	Sep 2023	Clarifiers, Biogas silos, Biogas balloons	96
Two Bridges Wastewater Treatment Plant	Lincoln Park	4.45	7.5	NJ0029386	Sep 2025	Clarifiers	0
Bergen County Utilities Authority	Edgewater	3.52	6	NJ0020591	Apr 2017	Clarifiers, Biogas silos	151
Willingboro Water Pollution Control Plant	Willingboro	3	5.22	NJ0023361	Dec 2030	Clarifiers, Biogas silos	8
Caldwell Boro MUA Caldwell WWTP	West Caldwell	2.98	4.5	NJ0020427	Sep 2028	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	68
Cape May Cnty MUA 7 Mile Beach Middle Rgnl Wtf	Cape May Court House	2.88	7.67	NJ0052990	Jun 2026	Uncovered lagoons, Biogas balloons	2
Cape May Cnty MUA Ocean City WWTP	Ocean City	2.57	8.24	NJ0035343	Jun 2026	Clarifiers	10

The 50 largest plants in New Jersey →New Jersey capital improvement plans →

New Jersey plants by treatment technology

Activated sludge and clarifiers (62)Anaerobic digesters and biogas (34)Lagoon systems (20)Oxidation ditches (17)

All 122 plants in New Jersey

Facility	City	Flow (MGD)
Middlesex County Utilities Authority	Sayreville	77.42
Bergen County Utilities Authority	Little Ferry	63.2
Essex & Union Cnty Joint Meeting STP	Elizabeth	44.93
Delaware #1 Water Pollution Control Facility	Camden	43.19
Atlantic County Utilities Authority POTW	Atlantic City	24.52
Ocean Cnty Util Auth Nwpcf	Bricktown	22.16
Rahway Valley Sewerage Authority	Rahway	19.3
Ocean Cnty Util Auth Cwpcf	Bayville	17.6
Gloucester Cnty Util Auth STP	West Deptford Twp	15.16
Somerset Raritian Valley Sewerage	Bridgewater	12.98
Monmouth Cnty Bayshore Outfall Auth Belford Pump Station	Belford	12.8
North Hudson Sewerage Auth WWTP	Hoboken	11.5
Trenton City DPW Sewer Auth	Trenton	9.42
Rockaway Valley Reg Sa	Boonton	9.09
Par Troy Hills Twp MUA WWTP @ Whippany River	Parsippany	7.98
Middletown Twp Slf Belford Section	Middletown	7.01
Pine Brook STP	Manalapan	5.83
Township Of Wayne	Wayne	5.72
Ewing Lawrence Sewer Auth	Lawrenceville	5.5
Two Bridges Wastewater Treatment Plant	Lincoln Park	4.45
Bergen County Utilities Authority	Edgewater	3.52
Willingboro Water Pollution Control Plant	Willingboro	3
Caldwell Boro MUA Caldwell WWTP	West Caldwell	2.98
Cape May Cnty MUA 7 Mile Beach Middle Rgnl Wtf	Cape May Court House	2.88
Cape May Cnty MUA Ocean City WWTP	Ocean City	2.57
Morristown Sewer Utility	Morristown	2.57
North Bergen Twp MUA Woodcliff STP	North Bergen	2.41
East Windsor Water Pollution Control Plant	East Windsor	2.38
Long Branch City Sewer Auth	Long Branch	2.29
Asbury Park Water Quality Central Facility	Asbury Park	2.08
Musconetcong Sewer Auth Water Pollution Control Facility	Budd Lake	2.07
Molitor Water Pollution Control Facility	Chatham	1.91
Delran Sewerage Authority	Delran	1.87
Elmwood WTP	Marlton	1.73
Maple Shade Twp Util Auth Park Avenue POTW	Maple Shade	1.71
Logan Township MUA	Bridgeport	1.46
Pemberton Twp MUA	Pemberton	1.45
Harrison Brook STP	Liberty Corner	1.29
Cinnaminson Twp Sewerage Auth	Cinnaminson	1.28
Roxbury Twp MUA Ajax WTP	Succasunna	1.23
Sussex Cnty MUA Upper Wallkill Valley Water Pollution Control Facility	Hamburg	1.21
Cape May Regional Wtf	Cape May Point	1.18
Berkeley Heights WPCF	Berkeley Heights	1.15
Butterworth Water Pollution Control Utility	Morristown	1.08
Long Hill Township STP	Stirling	0.9
Chatham Twp DPW Main STP Water Pollution Control Plant	Chatham	0.71
Wanaque Valley Rgnl Sewer Auth Treatment Plant	Wanaque	0.65
Newton Town DPW	Newton	0.61
Ac Wagner Youth Corr Fac	Chesterfield	0.6
Lambertville City Sewer Auth	Lambertville	0.6
Readington Lebanon Sewer Auth	Whitehouse	0.58
Beverly Sewerage Authority	Beverly	0.44
Bernardsville Boro	Bernardsville	0.44
Montgomery Twp MUA Pike Brook STP	Montgomery	0.41
Stage Ii Treatment Plant	Montgomery	0.4
Greenwich Twp STP	Gibbstown	0.4
Warren Twp Sewer Auth Stage 4 WWTP	Warren	0.39
Palmyra Boro Municipal Building	Palmyra	0.37
Woodstown Boro Water Dept	Woodstown	0.34
Njdoc - Bayside State Prison	Leesburg	0.32
Warren Cnty MUA Belvidere Area WWTF	Belvidere	0.3
Harrison Township Treatment Pl	Mullica Hill	0.3
Buena Borough MUA Cs-Septics	Buena	0.27
Medford Lakes Borough STP	Medford Lakes	0.27
Hightstown Boro AWWTP	Hightstown	0.25
Schooley'S Mountain Wastewater Treatment Plan	Long Valley	0.25
Penns Grove Sewerage Authority	Penns Grove	0.25
Warren Twp Sewerage Authority	Warren	0.24
Swedesboro Boro MUA WWTP	Swedesboro	0.23
Oxford Township Warren Co-Pequest MUA - Cs/stp/septics	Oxford	0.21
Milford Boro Sewer Auth	Milford	0.18
Greystone Park Psych Hospital	Greystone Park	0.17
Stony Brook Rgnl Sewerage Auth	Hopewell	0.14
Washington Twp MUA Long Valley	Long Valley	0.14
Montgomery Twp MUA Cherry Valley STP	Skillman	0.13
Allentown STP	Allentown	0.13
Riverton STP	Riverton	0.12
Plumsted MUA WWTP	Plumsted Twp	0.11
No Princeton Developmental Ctr	Skillman	0.1
Warren Twp Sewer Auth Stage 5 STP	Warren	0.09
Roosevelt Boro MUA WWTP	Millstone Township	0.08
Frenchtown Wastewater Treatment Plant	Frenchtown	0.08
Mercer County Correction Ctr WTP	Hopewell Twp	0.06
Wrightstown MUA-Martha Ave WTP	Wrightstown	0.05
Olde Milford Estates STP	West Milford	0.05
Suez Water Nj Highview Acres WWTP	West Milford	0.05
Njdoc Mountainview Youth Correctional Facility	Annandale	0.03
Fieldsboro Boro Sewer Dept WWTP	Fieldsboro	0.03
Delaware Township MUA	Sergeantsville	0.02
Suez Water Nj Crescent Park WWTP	West Milford	0.02
Sussex Cnty MUA Hampton Commons STP	Newton	0.02
Suez Water Nj Awosting WWTP	Hewitt	0.02
Hancocks Bridge STP	Hancocks Bridge	0.02
North Warren Regional School	Blairstown Twp	0.01
Njdhs Senator Garrett Hagedorn Psyciatric Hospital	Glen Gardner	0.007
Lounsberry Hollow Middle Sch STP	Vernon Twp	0.0067
Kittatinny Reg Hs/marion Mckeown School	Newton	0.0057
Sparta Alpine School	Sparta	0.005
Jefferson Twp High-Middle School	Jefferson Twp	0.0049
High Point Regional Hs	Wantage Twp	0.0044
Holmdel Twp Bd Of Ed Holmdel Village School STP	Holmdel	0.003
Ramapo Indian Hills Rgnl Sd Indian Hills High School WTP	Oakland	0.003
Sussex County Homestead WTP	Frankford	0.003
Springfield Twp Bd Of Ed Elementary School	Jobstown	0.0026
Warren Co Technical School STP	Washington	0.002
Alexandria Middle School	Pittstown	0.0019
Clinton Twp Bd Of Ed Round Valley School	Lebanon	0.0018
Arthur Stanlick School	Jefferson	0.0013
Union Twp School	Hampton	0.0009
Stonybrook School	Kinnelon	0.00077
Long Pond School WWTF	Newton	0.0007
Robert Erskine School STP	Ringwood	0.00044
Helen A Fort Middle School	Pemberton Twp	0.00026
Lester D. Wilson Elem School	Pittstown	0.00006
Allamuchy Stp, Township Of	Great Meadows	—
Cloverhill STP	Flanders	—
New Providence Boro DPW Complex WWTP	New Providence	—
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 September 11, 2026.

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