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Wastewater treatment plants in Pennsylvania

790 facilities · 873 MGD combined flow

Klarifi tracks 790 publicly owned wastewater treatment plants in Pennsylvania with a combined average flow of 873 MGD, serving about 2,647,784 residents. 136 plants treat more than 1 MGD and 8 more than 10 MGD; 90 use lagoon systems and 94 have digesters or biogas infrastructure. The largest is Northeast WPCP in Philadelphia at 153.22 MGD. 94 NPDES permits expire this year and 108 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 790 by average flow — browse the rest with the page links below.

790 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 →108 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.
FacilityCityAvg flow (MGD)Design (MGD)NPDES permitExpiresViolations (3y)
Northeast WPCPPhiladelphia153.22—PAL026689Dec 20300
Phila Water Dept - SE STPPhiladelphia86—PAL026662Dec 20301
City Of Erie, Pa - Wastewater Treatment PlantErie44.59—PAL026301Dec 20301
City Of Allentown Wastewater Treatment PlantAllentown31.6640PA0026000Sep 20070
Delcora-Western Regional Treatment PlantChester30.4844PA0027103Mar 202618
Harrisburg Advanced Wastewater Treatment FacilityHarrisburg17.17—PAL027197Dec 20304
Reading STPReading14.0220.5PA0026549Apr 20289
City Of Bethlehem Wastewater Treatment PlantBethlehem10.2340PA0026042May 203118
Springettsbury Wastewater Treatment PlantYork9.09—PAL026808Dec 20304
Gr Hazleton Jt Sew Auth WWTPHazleton6.718.9PA0026921Feb 20276

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)Anaerobic digesters and biogas (94)Lagoon systems (90)Oxidation ditches (46)

All 790 plants in Pennsylvania

FacilityCityFlow (MGD)
Northeast WPCPPhiladelphia153.22
Phila Water Dept - SE STPPhiladelphia86
City Of Erie, Pa - Wastewater Treatment PlantErie44.59
City Of Allentown Wastewater Treatment PlantAllentown31.66
Delcora-Western Regional Treatment PlantChester30.48
Harrisburg Advanced Wastewater Treatment FacilityHarrisburg17.17
Reading STPReading14.02
City Of Bethlehem Wastewater Treatment PlantBethlehem10.23
Springettsbury Wastewater Treatment PlantYork9.09
Gr Hazleton Jt Sew Auth WWTPHazleton6.71
Oaks WWTP (lower Perkiomen Valley)Oaks6.7
Upper Allegheny Jt Sani Auth STPCreighton6.36
Washington E Washington STPWashington6.15
Uniontown STPUniontown6.09
Lrbsa - Throop PlantThroop5.78
Lower Bucks WWTPLevittown5.71
New Kensington City Municipal Sanitary Authority STPNew Kensington5.6
Chambersburg Boro STPChambersburg5.44
Lebanon City STPLebanon5.34
Williamsport Sanitary Authority - Central PlantWilliamsport5.18
Log College STPWarminster5.03
Latrobe Mun Auth STPLatrobe5.03
Pottstown Wastewater Treatment PlantPottstown4.98
Valley Forge Sewer Authority WWTPPhoenixville4.95
Sharon STPSharon4.89
Norristown Muni STPNorristown4.87
New Stanton WPCPHunker4.84
Bradford STPBradford4.79
Clairton Mun Auth STPClairton4.78
Indiana Boro WWTPIndiana4.67
Piney Fork STPPittsburgh4.65
Altoona Easterly STPAltoona4.58
Upper Moreland Hatboro Jt Sew Auth/willow GroveWillow Grove4.46
E Norriton Plymouth /norristownPlymouth Meeting4.25
Lower Allen Twp STPNew Cumberland4.1
Hanover Boro STPMcsherrystown4
Allegheny Valley Joint Sewage AuthorityCheswick3.88
Morrisville Borough STPMorrisville3.84
Dover Twp Water Sys-Admire Booster ClDover3.82
Hermitage Muni Auth STPHermitage3.72
Johnstown Wastewater Treatment PlantJohnstown3.64
Leonard L Nary WWTP @ Montour RunCoraopolis3.49
Meadville Area STPMeadville3.49
University Area Joint Authority/spring Creek Pollution Control Fac.State College3.49
Kiski Vly Wpca STPLeechburg3.46
Ambler Boro Ms4 UaAmbler3.39
Swatara Twp STPHummelstown3.37
West Goshen Township WWTPWest Chester3.35
Brush Creek STPIrwin3.28
Upper Gwynedd-Towamencin Mun ALansdale3.25
Pennridge Wastewater Treatment Authority WWTPSellersville3.24
Pottsville Main STPPottsville3.13
Hampden Twp Roth Lane STPMechanicsburg3.01
Lrbsa Archbald STPJermyn2.87
Corry City STPCorry2.85
Carlisle Region Water Pollution Control FacilityCarlisle2.68
Ingleside STPJohnstown2.64
Plum Creek Wastewater Treatment PlantVerona2.62
Connellsville STPConnellsville2.59
Mountaintop Area Joint Sanitary AuthorityMountain Top2.59
Jeannette STPPenn2.58
Lititz Boro-Well #5 HouseLititz2.58
Lansdale Boro STPLansdale2.56
Upper Gwynedd Twp STPNorth Wales2.55
St Marys Wastewater Treatment PlantSaint Marys2.45
Matsunk STPKing Of Prussia2.45
Upper Merion Twp. Auth-Trout RKing Of Prussia2.39
Pleasant Hills Auth STPClairton2.39
Shippensburg STPShippensburg2.36
Scottdale-Everson STPScottdale2.33
City Of Dubois Sewage Treatment PlantDubois2.23
Warren City WWTPWarren2.19
Sunbury Muni Auth STPSunbury2.1
Riverview Sani Auth STPMoon Twp2.1
Huntingdon STPHuntingdon2.09
Penn Twp STPHanover2.08
Titusville Municipal Water-Treatment PlantTitusville2.08
City Of Lock Haven Water DeptLock Haven2.03
Elizabethtown STPElizabethtown2
Oil City STPOil City1.99
Hollidaysburg Regional STPHollidaysburg1.98
East Pennsboro STPCamp Hill1.94
Ephrata STPEphrata1.92
Wyomissing Vly Jt Sa STPReading1.92
Youghiogheny STPN Huntingdon1.85
Williamsport Sanitary Authority - West PlantWilliamsport1.85
Clearfield Mun Sew Sys STPClearfield1.84
Breakneck Creek Regional AuthMars1.8
Danville Boro STPDanville1.75
Abington Regional Wastewater Authority - ChinchillaClarks Summit1.75
Brodhead Creek Regional Authority WWTPStroudsburg1.72
Phoenixville Boro STPPhoenixville1.7
Wastewater Treatment PlantBellefonte1.69
Northeast Boro STPNorth East1.66
Milton Wastewater Treatment PlantMilton1.61
Grove City Boro STPGrove City1.56
Holiday Park STPPittsburgh1.49
Punxsutawney Boro STPPunxsutawney1.43
Tamaqua BoroTamaqua1.42
Ambridge Boro STPAmbridge1.4
West Mifflin - Thompson Run STPWest Mifflin1.39
Upper Saucon Twp STPCenter Valley1.39
Ridgway Boro STPRidgway1.32
Susquehanna Water Treatment PlantColumbia1.31
Girard Mun SewGirard1.3
Souderton Boro STPSouderton1.3
Farrell Mun SewFarrell1.29
Mt Pleasant Boro STPMount Pleasant1.28
Raccoon Creek STPAliquippa1.27
Catasaqua Mun Sew AuthCatasauqua1.25
Monongahela STPMonongahela1.24
New Freedom Boro Auth WWTPNew Freedom1.2
Vanport Township Municipal AutVanport1.2
Lewistown STPLewistown1.18
Eastern Snyder Cnty Regional Auth STPSelinsgrove1.16
New Oxford Municipal Authority WWTPNew Oxford1.16
Coaldale Lansford Summit Hll SewCoaldale1.15
Harvey Avenue STPDoylestown1.14
Concord Twp Central STPGlen Mills1.14
Bristol Borough WPC PlantBristol1.14
Berwick Mun AuthBerwick1.14
Coudersport Area Mun Auth STPCoudersport1.11
Amity Twp WWTPDouglassville1.11
Brush Run WPCPCanonsburg1.1
Oakmont Boro - WWTPOakmont1.08
Valley Jt Sew Auth STPAthens1.08
Conshohocken Boro AuthConshohocken1.07
Eureka WWTPNorth Wales1.04
Elkhorn Run STPMonaca1.04
Wellsboro Muni AuthWellsboro1.04
Ephrata Reg 2 STPEphrata1.03
Myerstown STPMyerstown1.02
Park Creek STPHorsham1.02
Bangor Wastewater Treatment PBangor1.02
Spring Twp STPSinking Spring1.01
Chippewa Township SanitaryBeaver Falls1
Edinboro Boro WTPEdinboro1
Pine Creek Muni Auth STPJersey Shore0.99
Ashland Area Water AuthorityAshland0.98
Mccandless Twp - Longvue #1 STPPittsburgh0.96
Moshannon Valley Jt. Auth.Philipsburg0.92
Pigeon Creek STPCharleroi0.92
Nazareth Boro Muni Auth WWTPNazareth0.92
Schuylkill Haven BoroughSchuylkill Haven0.9
Flaugherty Run STPMoon Township0.89
New Brighton STP-Boro San. Auth.New Brighton0.89
Mt Carmel Muni Sew Coll Sys & STPMount Carmel0.89
Pollock Run WPCPWest Newton0.88
Whitemarsh STPLafayette Hill0.88
Ctl Wayne Reg AuthHonesdale0.88
Elizabeth Boro STPElizabeth0.87
Upper Montgomery Joint Authority STPPennsburg0.87
N & S Shenango Joint STPJamestown0.86
Mahanoy City Municipal AuthoriMahanoy City0.86
Baden STPBaden0.86
Portage Area Sew Auth WWTPPortage0.86
Birdsboro STPBirdsboro0.85
Glassport Boro STPGlassport0.85
Goose Creek Wastewater Treatment PlantWest Chester0.84
Albion Boro WWTPAlbion0.83
Slippery Rock Muni AuthSlippery Rock0.82
Ebensburg WWTPEbensburg0.82
Kutztown Borough WWTPKutztown0.82
Duncansville STPDuncansville0.81
Brookville Muni AuthBrookville0.81
Saxonburg Area Authority STPRenfrew0.8
South Middleton Twp Water AuthBoiling Springs0.8
Rochester Area Joint Sewer AutRochester0.77
Silver Spring Twp STPMechanicsburg0.77
Waymart Area Auth WWTPWaymart0.76
Taylor Run Wastewater Treatment PlantWest Chester0.75
Upper Dublin WWTPFort Washington0.74
Slatington WWTPSlatington0.74
Northampton Boro/ SewNorthampton0.73
West Hills Area Wpca STPKittanning0.73
North Middleton Auth STPCarlisle0.73
Northeastern York Co. Sew AuthMount Wolf0.73
New Holland WWTPNew Holland0.72
Greenfield Twp Municipal Authority STPClaysburg0.72
Bucks Cnty Water & Sew Auth/green St STPDoylestown0.71
Mid-Cameron AuthorityEmporium0.71
Ford City Boro Muni Sew Disposal Auth WWTPFord City0.7
Buffalo Twp Mun Auth STPSarver0.7
Logan Twp STPAltoona0.69
Sewickley BoroSewickley0.68
Midland Boro STPMidland0.68
Dillsburg STPDillsburg0.67
Cresson Boro WWTPCresson0.67
Towanda Muni AuthTowanda0.66
Robesonia Wernersville STPWernersville0.65
Mifflinburg WWTPMifflinburg0.65
Milford-Trumbauersville WWTPSpinnerstown0.64
Telford Boro Auth WWTPTelford0.64
Upper Allen Twp STPMechanicsburg0.64
Kennett Square Boro WWTPKennett Square0.63
Highspire Boro - STPHighspire0.63
Blairsville Boro STPBlairsville0.63
Fairchance Georges STPSmithfield0.63
Antrim Twp Mun Auth STPGreencastle0.63
Annville Twp STPAnnville0.62

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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 October 12, 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 Pennsylvania.” Updated October 12, 2026. https://klarifi.io/facilities/pennsylvania

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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