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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
651–675 of 812Stoneboro Water Works
PA6430056 · 956 served
Concordia Lutheran Home
PA5100025 · 950 served
South Mountain Restoration Ctr
PA7280042 · 950 served
Port Royal Muni Auth
PA4340010 · 950 served
Beavertown Municipal Authority
PA4550012 · 935 served
Liverpool Muni Auth
PA7500014 · 934 served
Tel Hai Retirement Community
PA1150044 · 930 served
Foxburg Area Water & Sewer Aut
PA6160004 · 925 served
Umh Arbor Estates
PA1090007 · 920 served
Auburn Municipal Authority
PA3540015 · 920 served
Aqua Pa Emlenton
PA6610019 · 915 served
Whitetail Ski Resort
PA7280903 · 912 served
Cairnbrook Improvement Assn
PA4560021 · 910 served
Hyndman Boro Water Dept
PA4050003 · 910 served
Aqua Pa Water Co Chinchilla
PA2350004 · 904 served
Millheim Borough Water Company
PA4140084 · 902 served
Nwwa Olde Colonial Greene
PA1090097 · 900 served
Parker Area Water Auth
PA5030011 · 900 served
Mahoning Twp Muni Auth
PA5030024 · 900 served
Ridglea
PA1150215 · 900 served
Westtown School
PA1150834 · 900 served
West Cornwall Township Ma
PA7380031 · 900 served
Bowmanstown Authority
PA3130021 · 900 served
Lewis Run Borough
PA6420020 · 892 served
Icmsa Plumville
PA5320026 · 883 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