State Hub
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
476–500 of 812East Deer Twp Water Dept
PA5020013 · 2,000 served
Evans City Borough
PA5100033 · 1,990 served
Central City Water Auth
PA4560045 · 1,984 served
Irvona Municipal Authority
PA6170025 · 1,980 served
Youngsville Mun Waterworks
PA6620039 · 1,957 served
Mars Borough Water Works
PA5100049 · 1,956 served
Weaverland Valley Blue Ball
PA7360005 · 1,946 served
Icmsa Pine Township
PA5320042 · 1,932 served
Dover Boro Water Sys
PA7670072 · 1,900 served
Centre Hall Boro Water Dept
PA4140077 · 1,900 served
Pa Amer Water Co Montrose
PA2580023 · 1,890 served
E Armstrong Cnty Muni Auth
PA5030004 · 1,875 served
Beccaria Coalport Irvona M a
PA6170052 · 1,875 served
Rimersburg Boro Muni Auth
PA6160012 · 1,873 served
Industry Boro Muni Auth
PA5040036 · 1,865 served
Cheswick Boro Water Dept
PA5020008 · 1,861 served
Cornplanter Township
PA6610035 · 1,835 served
Sandy Township
PA6170053 · 1,828 served
Patton Boro Water Dept
PA4110024 · 1,805 served
Twp of Upper Makefield
PA1090122 · 1,800 served
Adamstown Borough
PA7360001 · 1,800 served
Bern Twp Muni Auth
PA3060045 · 1,800 served
Beech Creek Borough Authority
PA4180035 · 1,800 served
Williamsburg Munic Auth
PA4070022 · 1,800 served
Aqua Pa Water Co Hawley
PA2640028 · 1,800 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
Quick Links
Data source: Utility data from EPA SDWIS. 812 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18