How many wastewater treatment plants are there in Pennsylvania?

Klarifi tracks 783 publicly owned wastewater treatment plants in Pennsylvania with a combined average flow of 716 million gallons per day, serving about 1,848,910 residents. 106 of them treat more than 1 MGD and 7 more than 10 MGD.

What is the largest wastewater treatment plant in Pennsylvania?

Allegheny Cnty Sani Auth/allegheny Cnty in Pittsburgh is the largest plant in Pennsylvania by average flow, treating about 152.8 MGD.

What treatment technologies are common in Pennsylvania?

121 of Pennsylvania's plants use lagoon systems and 97 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Pennsylvania are up for renewal?

94 permits held by Pennsylvania plants expire in 2026 and 109 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater treatment plants in Pennsylvania

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

783 facilities · 716 MGD combined flow

Klarifi tracks 783 publicly owned wastewater treatment plants in Pennsylvania with a combined average flow of 716 MGD, serving about 1,848,910 residents. 106 plants treat more than 1 MGD and 7 more than 10 MGD; 121 use lagoon systems and 97 have digesters or biogas infrastructure. The largest is Allegheny Cnty Sani Auth/allegheny Cnty in Pittsburgh at 152.8 MGD. 94 NPDES permits expire this year and 109 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. Showing facilities 1–200 of 783 by average flow — browse the rest with the page links below.

783 plant locations in Pennsylvania; dot size follows average flow.

NPDES permits and renewals in Pennsylvania

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 Pennsylvania →94 permits expiring in 2026 →109 permits expiring in 2027 →73 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Pennsylvania

The 10 largest publicly owned wastewater treatment plants in Pennsylvania 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)
Allegheny Cnty Sani Auth/allegheny Cnty	Pittsburgh	152.8	—	PAL025984	Dec 2030	1
Phila Water Dept - SE STP	Philadelphia	77	—	PAL026662	Dec 2030	1
City Of Allentown Wastewater Treatment Plant	Allentown	31.07	40	PA0026000	Sep 2007	0
Delcora-Western Regional Treatment Plant	Chester	27.54	44	PA0027103	Mar 2026	18
City Of Erie, Pa - Wastewater Treatment Plant	Erie	24.1	—	PAL026301	Dec 2030	1
Reading STP	Reading	14.09	20.5	PA0026549	Apr 2028	9
Harrisburg Advanced Wastewater Treatment Facility	Harrisburg	13.2	—	PAL027197	Dec 2030	4
City Of Bethlehem Wastewater Treatment Plant	Bethlehem	9.97	40	PA0026042	May 2031	18
Springettsbury Wastewater Treatment Plant	York	7.61	—	PAL026808	Dec 2030	4
Lrbsa - Throop Plant	Throop	5.7	10	PA0027090	Aug 2021	6

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

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

Pennsylvania plants by treatment technology

Activated sludge and clarifiers (235)Lagoon systems (121)Anaerobic digesters and biogas (97)Oxidation ditches (44)

All 783 plants in Pennsylvania

Facility	City	Flow (MGD)
Allegheny Cnty Sani Auth/allegheny Cnty	Pittsburgh	152.8
Phila Water Dept - SE STP	Philadelphia	77
City Of Allentown Wastewater Treatment Plant	Allentown	31.07
Delcora-Western Regional Treatment Plant	Chester	27.54
City Of Erie, Pa - Wastewater Treatment Plant	Erie	24.1
Reading STP	Reading	14.09
Harrisburg Advanced Wastewater Treatment Facility	Harrisburg	13.2
City Of Bethlehem Wastewater Treatment Plant	Bethlehem	9.97
Springettsbury Wastewater Treatment Plant	York	7.61
Lrbsa - Throop Plant	Throop	5.7
Oaks WWTP (lower Perkiomen Valley)	Oaks	5.54
Lower Bucks WWTP	Levittown	5.34
Lebanon City STP	Lebanon	5.22
Chambersburg Boro STP	Chambersburg	5.16
Gr Hazleton Jt Sew Auth WWTP	Hazleton	5.15
Valley Forge Sewer Authority WWTP	Phoenixville	4.66
Washington E Washington STP	Washington	4.51
Lower Allen Twp STP	New Cumberland	4.33
Upper Allegheny Jt Sani Auth STP	Creighton	4.3
Uniontown STP	Uniontown	4.2
New Kensington City Municipal Sanitary Authority STP	New Kensington	4.03
Norristown Muni STP	Norristown	3.96
Log College STP	Warminster	3.78
Upper Moreland Hatboro Jt Sew Auth/willow Grove	Willow Grove	3.68
Hanover Boro STP	Mcsherrystown	3.65
E Norriton Plymouth /norristown	Plymouth Meeting	3.6
Indiana Boro WWTP	Indiana	3.43
Clairton Mun Auth STP	Clairton	3.42
Pottstown Wastewater Treatment Plant	Pottstown	3.34
Piney Fork STP	Pittsburgh	3.22
Morrisville Borough STP	Morrisville	3.21
New Stanton WPCP	Hunker	3.14
West Goshen Township WWTP	West Chester	3.12
Latrobe Mun Auth STP	Latrobe	3.1
Williamsport Sanitary Authority - Central Plant	Williamsport	3.06
Swatara Twp STP	Hummelstown	2.91
Sharon STP	Sharon	2.89
Upper Gwynedd-Towamencin Mun A	Lansdale	2.85
Altoona Easterly STP	Altoona	2.82
University Area Joint Authority/spring Creek Pollution Control Fac.	State College	2.82
Hampden Twp Roth Lane STP	Mechanicsburg	2.79
Lititz Boro-Well #5 House	Lititz	2.78
Matsunk STP	King Of Prussia	2.57
Leonard L Nary WWTP @ Montour Run	Coraopolis	2.56
Dover Twp Water Sys-Admire Booster Cl	Dover	2.51
Hermitage Muni Auth STP	Hermitage	2.42
Allegheny Valley Joint Sewage Authority	Cheswick	2.41
Bradford STP	Bradford	2.4
Brush Creek STP	Irwin	2.4
Shippensburg STP	Shippensburg	2.35
Kiski Vly Wpca STP	Leechburg	2.33
Johnstown Wastewater Treatment Plant	Johnstown	2.3
Carlisle Region Water Pollution Control Facility	Carlisle	2.28
Upper Merion Twp. Auth-Trout R	King Of Prussia	2.27
Abington WWTP	Abington	2.23
Upper Gwynedd Twp STP	North Wales	2.21
Pottsville Main STP	Pottsville	2.19
Lansdale Boro STP	Lansdale	2.15
Mountaintop Area Joint Sanitary Authority	Mountain Top	2.04
Wyomissing Vly Jt Sa STP	Reading	1.99
Ephrata STP	Ephrata	1.93
Pleasant Hills Auth STP	Clairton	1.83
Wastewater Treatment Plant	Bellefonte	1.82
Plum Creek Wastewater Treatment Plant	Verona	1.76
Penn Twp STP	Hanover	1.75
Sunbury Muni Auth STP	Sunbury	1.75
Riverview Sani Auth STP	Moon Twp	1.72
Phoenixville Boro STP	Phoenixville	1.72
Elizabethtown STP	Elizabethtown	1.7
Quakertown WWTP	Quakertown	1.68
Jeannette STP	Penn	1.67
Milton Wastewater Treatment Plant	Milton	1.66
City Of Dubois Sewage Treatment Plant	Dubois	1.63
City Of Lock Haven Water Dept	Lock Haven	1.62
St Marys Wastewater Treatment Plant	Saint Marys	1.6
Susquehanna Water Treatment Plant	Columbia	1.58
Brodhead Creek Regional Authority WWTP	Stroudsburg	1.58
Meadville Area STP	Meadville	1.57
Lrbsa Archbald STP	Jermyn	1.54
Hollidaysburg Regional STP	Hollidaysburg	1.5
Breakneck Creek Regional Auth	Mars	1.49
Youghiogheny STP	N Huntingdon	1.42
New Freedom Boro Auth WWTP	New Freedom	1.4
Corry City STP	Corry	1.4
Ingleside STP	Johnstown	1.4
Northeast Boro STP	North East	1.36
East Pennsboro STP	Camp Hill	1.35
Huntingdon STP	Huntingdon	1.35
Upper Saucon Twp STP	Center Valley	1.33
Danville Boro STP	Danville	1.28
Catasaqua Mun Sew Auth	Catasauqua	1.26
Williamsport Sanitary Authority - West Plant	Williamsport	1.22
Conshohocken Boro Auth	Conshohocken	1.18
Connellsville STP	Connellsville	1.17
Abington Regional Wastewater Authority - Chinchilla	Clarks Summit	1.13
Clearfield Mun Sew Sys STP	Clearfield	1.13
Bristol Borough WPC Plant	Bristol	1.1
Ambridge Boro STP	Ambridge	1.1
Holiday Park STP	Pittsburgh	1.1
Harvey Avenue STP	Doylestown	1.1
Titusville Municipal Water-Treatment Plant	Titusville	1.09
Concord Twp Central STP	Glen Mills	1.09
Grove City Boro STP	Grove City	1.05
Eastern Snyder Cnty Regional Auth STP	Selinsgrove	1.02
Berwick Mun Auth	Berwick	1.02
New Oxford Municipal Authority WWTP	New Oxford	1
Valley Jt Sew Auth STP	Athens	1
Warren City WWTP	Warren	0.99
Tamaqua Boro	Tamaqua	0.98
Eureka WWTP	North Wales	0.97
Myerstown STP	Myerstown	0.97
Lewistown STP	Lewistown	0.96
Oakmont Boro - WWTP	Oakmont	0.95
Spring Twp STP	Sinking Spring	0.94
Souderton Boro STP	Souderton	0.94
Goose Creek Wastewater Treatment Plant	West Chester	0.93
Vanport Township Municipal Aut	Vanport	0.92
Bangor Wastewater Treatment P	Bangor	0.9
Ephrata Reg 2 STP	Ephrata	0.9
Brush Run WPCP	Canonsburg	0.89
Oil City STP	Oil City	0.85
Franklin Wastewater Treatment Plant	Franklin	0.85
Monongahela STP	Monongahela	0.85
Park Creek STP	Horsham	0.84
Lewisburg Area Jt. Sewer Auth	Lewisburg	0.84
Nazareth Boro Muni Auth WWTP	Nazareth	0.84
Kutztown Borough WWTP	Kutztown	0.81
Birdsboro STP	Birdsboro	0.79
Punxsutawney Boro STP	Punxsutawney	0.78
New Holland WWTP	New Holland	0.78
South Middleton Twp Water Auth	Boiling Springs	0.76
Mt Joy Boro Auth	Mount Joy	0.76
Silver Spring Twp STP	Mechanicsburg	0.75
West Mifflin - Thompson Run STP	West Mifflin	0.74
Mt Pleasant Boro STP	Mount Pleasant	0.74
Whitemarsh STP	Lafayette Hill	0.73
Ridgway Boro STP	Ridgway	0.73
Taylor Run Wastewater Treatment Plant	West Chester	0.73
Amity Twp WWTP	Douglassville	0.73
Flaugherty Run STP	Moon Township	0.72
Elkhorn Run STP	Monaca	0.71
Raccoon Creek STP	Aliquippa	0.7
Pollock Run WPCP	West Newton	0.67
Moshannon Valley Jt. Auth.	Philipsburg	0.67
Upper Dublin WWTP	Fort Washington	0.67
Upper Allen Twp STP	Mechanicsburg	0.67
Northampton Boro/ Sew	Northampton	0.66
Coaldale Lansford Summit Hll Sew	Coaldale	0.66
Pine Creek Muni Auth STP	Jersey Shore	0.66
Chippewa Township Sanitary	Beaver Falls	0.65
Bucks Cnty Water & Sew Auth/green St STP	Doylestown	0.65
Wellsboro Muni Auth	Wellsboro	0.65
Baden STP	Baden	0.64
Robesonia Wernersville STP	Wernersville	0.64
Mt Carmel Muni Sew Coll Sys & STP	Mount Carmel	0.63
Schuylkill Haven Borough	Schuylkill Haven	0.63
Saxonburg Area Authority STP	Renfrew	0.62
Sewickley Boro	Sewickley	0.61
Edinboro Boro WTP	Edinboro	0.61
Antrim Twp Mun Auth STP	Greencastle	0.61
Pine Grove Joint Treatment Authority WWTP	Pine Grove	0.6
Mccandless Twp - Longvue #1 STP	Pittsburgh	0.6
Millersville STP	Millersville	0.6
New Brighton STP-Boro San. Auth.	New Brighton	0.59
Waymart Area Auth WWTP	Waymart	0.59
Ctl Wayne Reg Auth	Honesdale	0.59
Midland Boro STP	Midland	0.59
Highspire Boro - STP	Highspire	0.58
West Hills Area Wpca STP	Kittanning	0.58
Marietta Donegal STP	Marietta	0.58
Upper Montgomery Joint Authority STP	Pennsburg	0.57
Elizabeth Boro STP	Elizabeth	0.57
Annville Twp STP	Annville	0.56
Slatington WWTP	Slatington	0.56
Butler Twp - St Johns STP	Drums	0.55
Buffalo Twp Mun Auth STP	Sarver	0.55
Pigeon Creek STP	Charleroi	0.54
Robinson Twp Muni Auth-Robinson Wat Trt Plt	Pittsburgh	0.54
Dillsburg STP	Dillsburg	0.54
Derry Borough STP	Derry	0.54
Northeastern York Co. Sew Auth	Mount Wolf	0.54
Kennett Square Boro WWTP	Kennett Square	0.53
Duncansville STP	Duncansville	0.53
Bedford STP	Bedford	0.53
Ebensburg WWTP	Ebensburg	0.52
Slippery Rock Muni Auth	Slippery Rock	0.52
Towanda Muni Auth	Towanda	0.52
Farrell Mun Sew	Farrell	0.51
Glassport Boro STP	Glassport	0.51
North Middleton Auth STP	Carlisle	0.5
Brookville Muni Auth	Brookville	0.5
Albion Boro WWTP	Albion	0.5
Mainland STP	Harleysville	0.5
Littlestown STP	Littlestown	0.5
Shenandoah Mun Sew Auth	Shenandoah	0.49
Mifflinburg WWTP	Mifflinburg	0.49
Manheim STP	Manheim	0.48
Coudersport Area Mun Auth STP	Coudersport	0.48
Milford-Trumbauersville WWTP	Spinnerstown	0.47
Maidencreek Twp STP	Reading	0.47

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Wastewater treatment in Pennsylvania: 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 21, 2026.

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