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
76–100 of 812Auth of Boro of Charleroi
PA5630039 · 27,000 served
Horsham Water&sewer Authority
PA1460033 · 26,000 served
Carlisle Water Trmt Plt
PA7210002 · 26,000 served
Columbia Water Co
PA7360123 · 25,200 served
Paw Glen Alsace Div
PA3060088 · 24,951 served
Ephrata Area Joint Authority
PA7360045 · 24,500 served
Falls Twp Water & Sewer Dept
PA1090022 · 24,400 served
Paw Blue Mountain Division
PA3480055 · 23,763 served
Pa-american Water- Uniontown
PA5260020 · 23,125 served
Highland S & W Auth Beaverdam
PA4110017 · 22,617 served
Pa American Water Co-indiana D
PA5320025 · 22,360 served
Nwwa Warrington Township
PA1090070 · 21,588 served
Dover Twp Water Sys
PA7670073 · 21,097 served
Muhlenberg Twp Muni Auth
PA3060038 · 21,000 served
East Hempfield Water Auth
PA7360063 · 20,988 served
Paw Philipsburg
PA4140087 · 20,784 served
Ambler Boro Water Dept
PA1460020 · 20,000 served
St Marys Area Water Auth
PA6240016 · 19,588 served
Ambridge Water Auth
PA5040008 · 19,500 served
Western Allegheny County Mun a
PA5020034 · 19,031 served
Center Twp Water Auth
PA5040007 · 19,000 served
Elizabethtown Area Water
PA7360124 · 19,000 served
Fox Chapel Auth
PA5020040 · 18,500 served
Bradford City Water Authority
PA6420014 · 18,500 served
Pawc Pocono District
PA2450063 · 17,860 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