Allegheny County, Pennsylvania: drinking water report. Allegheny County – Pittsburgh and over 100 surrounding municipalities – sits at the confluence of…
Allegheny County – Pittsburgh and over 100 surrounding municipalities – sits at the confluence of three rivers: the Allegheny, Monongahela, and Ohio. About 1.2 million residents receive water from multiple providers, with the Pittsburgh Water and Sewer Authority (PWSA) serving the city and several authorities handling suburban areas. The rivers carry industrial heritage – steel mills, coal operations, and chemical plants operated along these waterways for over a century.
Pittsburgh has faced national attention for lead in drinking water. A 2016 testing crisis revealed elevated lead levels across the city, linked to aging infrastructure and a treatment chemical change that destabilized lead pipes. PWSA has since invested in corrosion control and lead service line replacement, but the American Water Works Association estimated in 2023 that approximately 27,000 lead service lines remained in the PWSA system.
UCMR5 data shows PFAS detections in county water systems. The three-river watershed receives industrial and municipal discharges from communities upstream. Pennsylvania's proposed PFAS MCLs of 14 ppt for PFOA and 18 ppt for PFOS would be among the stricter state standards nationally. According to the PA DEP's 2024 monitoring data, four water systems in Allegheny County reported PFAS above proposed limits.
Lead is the highest-priority concern for Pittsburgh residents, particularly in homes built before 1950 with original plumbing.
Check your water to see data for your specific area. A dual-purpose filter certified for both lead and PFAS provides the most value. Our water filter guide covers effective options. Pull your detailed report for trend data, and visit our Pennsylvania page for statewide context.