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AquaCensus

Pennsylvania public water systems

7,217 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

7,217

Population served

12.6M

Community systems

1,762

Groundwater share

93.2%

System types in Pennsylvania

1,762

Community water system

1,026

Non-transient non-community water system

4,429

Transient non-community water system

Largest water systems in Pennsylvania

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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 ScrantonLackawanna137,142CommunitySurface 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

Berks471 systemsMonroe405 systemsLancaster402 systemsBucks298 systemsChester254 systemsLuzerne233 systemsPike208 systemsWayne200 systemsNorthampton199 systemsYork198 systemsLehigh197 systemsSchuylkill176 systemsMontgomery166 systemsCrawford163 systemsButler155 systemsAdams147 systemsCarbon143 systemsErie134 systemsDauphin134 systemsLycoming126 systemsMercer124 systemsFranklin115 systemsLackawanna113 systemsSusquehanna107 systemsLebanon105 systemsSomerset102 systemsCumberland94 systemsPerry93 systemsBedford92 systemsWyoming90 systemsColumbia87 systemsHuntingdon86 systemsBeaver83 systemsBradford81 systemsTioga78 systemsCentre76 systemsWestmoreland74 systemsCambria65 systemsAllegheny65 systemsVenango63 systemsNorthumberland62 systemsWarren61 systemsLawrence55 systemsMcKean54 systemsBlair50 systemsIndiana50 systemsPotter46 systemsSnyder45 systemsClarion44 systemsArmstrong42 systemsFayette40 systemsJuniata38 systemsJefferson38 systemsUnion37 systemsClearfield36 systemsClinton31 systemsFulton31 systemsSullivan30 systemsMifflin27 systemsWashington26 systemsElk26 systemsForest23 systemsDelaware21 systemsMontour20 systemsCameron14 systemsCecil9 systemsGreene7 systemsPhiladelphia6 systemsHarris5 systemsGarrett4 systemsHarford3 systems
Caroline2 systems
Anne Arundel2 systems
Calvert2 systems
Carroll2 systems
Queen Anne's2 systems
Mahoning2 systems
Monterey1 systems
Garfield1 systems
Baltimore1 systems
Kent1 systems
St. Mary's1 systems
Worcester1 systems
Presque Isle1 systems
Calhoun1 systems
Shiawassee1 systems
Dickinson1 systems
Ashtabula1 systems
Belmont1 systems
Columbiana1 systems
Harrison1 systems
Huron1 systems
Summit1 systems
Logan1 systems
Brewster1 systems
DeWitt1 systems
Kendall1 systems
Fauquier1 systems
Skagit1 systems