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Pennsylvania Water Quality
812
Utilities in database
11.3M
Residents served
30%
On private wells
3
Key contaminants tracked
Drinking Water in Pennsylvania
Pennsylvania has 812 community water systems serving approximately 11.3 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead, nitrates. 30% of Pennsylvania residents rely on private wells. DEP holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Pennsylvania
176–200 of 812New Holland Borough
PA7360099 · 8,490 served
Collegeville Trappe Joint Pwd
PA1460022 · 8,470 served
N Middleton Water Auth
PA7210049 · 8,455 served
Houtzdale Municipal Authority
PA6170023 · 8,410 served
Hemlock Farms (main)
PA2520033 · 8,321 served
Wellsboro Municipal Authority
PA2590042 · 8,225 served
Pa American Audubon
PA1460055 · 8,200 served
Aqua Pa Spring Run
PA1150089 · 8,151 served
Boyertown Muni Auth
PA3060081 · 8,000 served
Tamaqua Area Water Authority
PA3540012 · 8,000 served
Kittanning Suburb Jt Water Aut
PA5030043 · 8,000 served
Millersville Univ
PA7360127 · 7,950 served
Brighton Twp Muni Auth
PA5040017 · 7,920 served
Grove City Boro Water Dept
PA6430040 · 7,871 served
Pa-american Water-brownsville
PA5260005 · 7,844 served
Veolia Water Bethel
PA1230012 · 7,809 served
Edinboro Water Authority
PA6250022 · 7,800 served
Municipal Authority of Corry
PA6250012 · 7,800 served
Conemaugh Twp Muni Auth
PA4560048 · 7,800 served
City of Dubois Water Depart
PA6170016 · 7,794 served
Edgeworth Boro Muni Auth
PA5020015 · 7,781 served
Upper Leacock Township
PA7360140 · 7,734 served
Telford Borough Authority
PA1460050 · 7,700 served
Wernersville Muni Water Auth
PA3060076 · 7,654 served
Veolia Water Pa Dallas
PA2400076 · 7,563 served
Key Contaminant Concerns in Pennsylvania
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Pennsylvania Water FAQs
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Data source: Utility data from EPA SDWIS. 812 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18