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
151–175 of 812Icmsa Crooked Creek
PA5320109 · 9,638 served
Oil City
PA6610023 · 9,608 served
Veolia Middletown
PA7220038 · 9,600 served
Myerstown Water Auth
PA7380025 · 9,500 served
Bellefonte Borough Water Auth
PA4140075 · 9,500 served
Aqua Shenandoah
PA3540044 · 9,500 served
Windber Area Auth
PA4560013 · 9,463 served
Lititz Boro
PA7360126 · 9,397 served
Lansford Coaldale Jt Water Aut
PA3130004 · 9,300 served
Muni Auth of Washington Twp
PA5260009 · 9,100 served
General Authority of Franklin
PA6610020 · 9,096 served
Paw Bangor District
PA3480038 · 9,008 served
Lehighton Water Authority
PA3130009 · 9,000 served
Dillsburg Area Authority
PA7670071 · 8,962 served
Pa American Water Punxsy
PA6330010 · 8,800 served
Aqua Pa Friendship
PA1150137 · 8,800 served
Municipal Water Auth Adams Twp
PA5100141 · 8,700 served
Doylestown Boro Water Dept
PA1090081 · 8,700 served
Dtma Main System
PA1090128 · 8,655 served
Aqua Pa Greenville
PA6430037 · 8,600 served
Warwick Twp Lititz Sys
PA7360116 · 8,561 served
Hollidaysburg Muni Auth
PA4070017 · 8,523 served
Salisbury Twp Water System
PA3390062 · 8,522 served
Wyomissing Boro Water System
PA3060083 · 8,500 served
Ebensburg Boro Muni Auth
PA4110009 · 8,500 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