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AquaCensus

Pennsylvania public water systems

7,243 active systems regulated under the Safe Drinking Water Act, serving a reported 12.6M people across 99 counties.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

7,243

Population served

12.6M

Community systems

1,762

Groundwater share

93.3%

System types in Pennsylvania

1,762

Community water system

1,032

Non-transient non-community water system

4,449

Transient non-community water system

Largest water systems in Pennsylvania

The largest active public water systems in Pennsylvania by population served
#Water systemCountyPopulation servedTypeSource
1Philadelphia Water DepartmentPhiladelphia1,600,000CommunitySurface water
2Aqua Pa Main SystemMontgomery822,600CommunitySurface water
3Pa Amer Water Co-PittsburghAllegheny686,000CommunitySurface water
4Pittsburgh Water & Sewer AuthAllegheny520,000CommunitySurface water
5Erie City Water AuthorityErie220,001CommunitySurface water
6York Water CoYork206,762CommunitySurface water
7West View Water AuthorityAllegheny200,000CommunitySurface water
8Mawc Sweeney PlantWestmoreland143,000CommunitySurface water
9Chester Water AuthorityDelaware140,437CommunitySurface water
10Pa Amer Water Co Lake ScrantonLackawanna134,570CommunitySurface water
11Mawc Yough PlantFayette133,000CommunitySurface water
12Wilkinsburg-Penn Jt Water AuthAllegheny125,000CommunitySurface water
13City of LancasterLancaster120,000CommunitySurface water
14Lca Allentown DivisionLehigh118,000CommunitySurface water
15City of BethlehemNorthampton117,259CommunitySurface water
16Veolia WaterDauphin110,000CommunitySurface water
17Pa American Water Co WestCumberland105,127CommunitySurface water
18Easton Area Water SystemNorthampton96,867CommunitySurface water
19Reading Area Water AuthorityBerks95,100CommunitySurface water
20North Penn Water AuthorityMontgomery91,941CommunityPurchased surface water
21Pa American NorristownMontgomery88,885CommunitySurface water
22North Wales Water AuthorityMontgomery72,496CommunitySurface water
23State College Boro Water AuthCentre72,000CommunitySurface water
24Capital Region WaterDauphin66,540CommunitySurface water
25Lower Bucks Co Joint Mun AuthBucks63,007CommunitySurface water

By county

Berks472 systemsMonroe406 systemsLancaster406 systemsBucks299 systemsChester253 systemsLuzerne234 systemsPike209 systemsWayne205 systemsNorthampton199 systemsLehigh197 systemsYork197 systemsSchuylkill181 systemsMontgomery166 systemsCrawford161 systemsButler158 systemsAdams146 systemsCarbon144 systemsDauphin136 systemsErie134 systemsLycoming128 systemsMercer125 systemsFranklin116 systemsLackawanna114 systemsSusquehanna106 systemsLebanon103 systemsSomerset101 systemsCumberland94 systemsPerry93 systemsBedford93 systemsWyoming91 systemsHuntingdon86 systemsColumbia86 systemsBeaver84 systemsBradford80 systemsTioga78 systemsCentre76 systemsWestmoreland75 systemsCambria66 systemsAllegheny65 systemsVenango63 systemsNorthumberland62 systemsWarren61 systemsLawrence55 systemsMcKean54 systemsIndiana50 systemsBlair50 systemsSnyder46 systemsPotter46 systemsClarion44 systemsArmstrong42 systemsFayette40 systemsJefferson38 systemsJuniata37 systemsUnion37 systemsClearfield36 systemsFulton31 systemsClinton31 systemsSullivan30 systemsWashington27 systemsMifflin27 systemsElk26 systemsForest23 systemsDelaware21 systemsMontour20 systemsCameron14 systemsCecil9 systemsGreene7 systemsPhiladelphia6 systemsHarris5 systemsGarrett4 systemsMahoning3 systemsHarford3 systems
Anne Arundel2 systems
Carroll2 systems
Caroline2 systems
Calvert2 systems
Queen Anne's2 systems
Kent1 systems
Worcester1 systems
Shiawassee1 systems
Dickinson1 systems
Logan1 systems
Summit1 systems
Garfield1 systems
Ashtabula1 systems
Columbiana1 systems
Kendall1 systems
Monterey1 systems
Calhoun1 systems
Huron1 systems
Harrison1 systems
Belmont1 systems
Fauquier1 systems
Brewster1 systems
DeWitt1 systems
St. Mary's1 systems
Presque Isle1 systems
Baltimore1 systems
Skagit1 systems