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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
326–350 of 812Middlesex Twp Muni Auth
PA7210063 · 3,527 served
State Correctional Inst
PA7210046 · 3,500 served
Veolia Water Pa Shavertown
PA2400091 · 3,472 served
Mountaintop Reg Water Auth
PA4140090 · 3,456 served
Springdale Boro Water Dept
PA5020053 · 3,405 served
Borough of Cornwall
PA7380007 · 3,343 served
Fairview Twp Water Auth Dist 3
PA6250040 · 3,320 served
Girard Boro Water Dept
PA6250049 · 3,301 served
Emporium Water Company
PA6120002 · 3,300 served
Spring Twp Water Authority
PA4140118 · 3,300 served
Ligonier Twp Muni Auth
PA5650080 · 3,293 served
Mt Holly Springs Boro Auth
PA7210037 · 3,261 served
Walker Twp Water Assoc
PA4140120 · 3,250 served
Conyngham Sugarloaf Joint Ma
PA2400048 · 3,230 served
Lake Meade Muni Auth
PA7010036 · 3,221 served
Lykens Boro Auth
PA7220022 · 3,220 served
Reserve Twp Water Dept
PA5020047 · 3,204 served
Harmar Twp Muni Auth
PA5020009 · 3,200 served
Pawc Manwalamink
PA2450049 · 3,200 served
Aqua Pa Water Co Sci Waymart
PA2640020 · 3,200 served
Glendale Valley Municipal Auth
PA4110060 · 3,200 served
Newport Boro Water Auth
PA7500022 · 3,200 served
Pa Amer Water Co Forest City
PA2359014 · 3,188 served
Roaring Spring Muni Water Auth
PA4070019 · 3,182 served
Coudersport Boro Authority
PA6530009 · 3,166 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