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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
751–775 of 812West Carroll W Auth Bakerton
PA4110058 · 670 served
Village 2 Community Assoc
PA1090040 · 650 served
Petersburg Bor Water Auth
PA4310019 · 650 served
Icmsa Coy
PA5320048 · 650 served
Village of Pleasant Hill
PA3060032 · 650 served
Hooversville Boro
PA4560037 · 645 served
Confluence Boro Muni Auth
PA4560033 · 645 served
Aqua Pa Springhouse Farms
PA3390068 · 645 served
South Pymatuning
PA6430077 · 641 served
Pine Grove Twp Water System
PA6620029 · 640 served
Frederick Living
PA1460075 · 640 served
Ulysses Municipal Authority
PA6530006 · 640 served
Cranesville Water Department
PA6250078 · 638 served
Eei Meadows Complex
PA2400115 · 628 served
Valley Run Water System
PA3060135 · 626 served
Aqua Pa Rivercrest
PA2660017 · 625 served
Icmsa Lucerne
PA5320046 · 625 served
Tioga Boro Municipal Authority
PA2590031 · 615 served
Port Matilda Waterworks
PA4140088 · 615 served
Tionesta Borough Water Supply
PA6270001 · 610 served
Aqua Pa Stonecroft
PA3060134 · 600 served
Lil Wolf Mhp
PA3390089 · 600 served
Aqua Pa Water Co Moscow
PA2350027 · 600 served
Aqua Pa Peddlers View
PA1090147 · 600 served
Crawford Township Authority
PA4180062 · 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