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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
101–125 of 812Shippensburg Boro Water Auth
PA7210043 · 17,800 served
Meadville Area Water Authority
PA6200036 · 17,339 served
Pa Amer Water Co Ellwood Cty
PA6370011 · 17,200 served
Pa American Water Co Clarion
PA6160001 · 16,600 served
Phoenixville Water Dept
PA1150077 · 16,599 served
Robinson Twp Muni Auth
PA5020045 · 16,354 served
Upper Southampton Mun Auth
PA1090063 · 16,000 served
Highridge Water Auth
PA5650069 · 16,000 served
Red Lion Municipal Authority
PA7670086 · 15,882 served
Slippery Rock Muni Auth
PA5100079 · 15,778 served
Mun Water Auth of Aliquippa
PA5040006 · 15,685 served
Aqua Pa Susquehanna Division
PA2080028 · 15,569 served
Pa American Water Berwick
PA4190013 · 15,282 served
Mt Joy Boro Auth
PA7360091 · 15,261 served
Perkasie Regional Authority
PA1090046 · 15,000 served
Creswell Heights Jt Auth
PA5040063 · 15,000 served
Warwick Twp Water & Sewer Auth
PA1090127 · 14,699 served
Pa American Water Co Warren
PA6620020 · 14,650 served
Swt Main System
PA3390065 · 14,500 served
Kutztown Borough Water
PA3060041 · 14,200 served
Emmaus Borough Public Water
PA3390032 · 14,000 served
Clearfield Municipal Auth
PA6170008 · 14,000 served
Huntingdon Boro Water Dept
PA4310012 · 13,776 served
Harrison Twp Water Auth
PA5020108 · 13,411 served
Morrisville Munic Authority
PA1090037 · 13,342 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