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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
301–325 of 812Ashland Area Water Authority
PA3540030 · 4,200 served
Akron Borough
PA7360128 · 4,200 served
Aqua Pa Inc Treasure Lake Div
PA6170048 · 4,155 served
Buckingham Twp Furlong
PA1090159 · 4,150 served
Zelienople Boro
PA5100093 · 4,123 served
Mansfield Borough Mun Auth
PA2590038 · 4,100 served
Wrightsville Boro Muni Auth
PA7670097 · 4,076 served
East Donegal
PA7360083 · 4,048 served
Blairsville Muni Auth
PA5320006 · 4,023 served
New Oxford Munci Auth
PA7010025 · 3,963 served
Baden Boro Water Dept
PA5040080 · 3,948 served
Hegins Hubley Authority
PA3540047 · 3,870 served
Denver Boro
PA7360017 · 3,861 served
Mountain Water Assn
PA5260032 · 3,856 served
Masontown Muni Water Works
PA5260013 · 3,841 served
Somerset Twp Muni Auth Oakridg
PA4560046 · 3,800 served
Tobyhanna Army Depot
PA2450053 · 3,800 served
Petroleum Valley Rwa
PA5100147 · 3,800 served
Roamingwood Sewer and Water
PA2640025 · 3,775 served
Masonic Homes
PA7360025 · 3,707 served
Brackenridge Boro Water Dept
PA5020006 · 3,700 served
Cooper Twp Municipal Auth
PA6170041 · 3,700 served
Mifflinburg Boro Water Dept
PA4600012 · 3,690 served
Pleasant Valley Water Auth
PA5260006 · 3,630 served
Aqua Pa Perkiomen Township
PA1460069 · 3,600 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.
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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