WaterQ

Pennsylvania Tap Water Quality Rankings 2026: 31st in Nation | WaterQ

Alex Carter
By Alex Carter
Water Quality Researcher · Published 2026-04-02

Pennsylvania ranks 31st in our 2026 national tap water quality analysis. The state's score reflects two intertwined stories: the relatively strong, well-resourced systems serving Philadelphia and Pittsburgh, and the patchwork of roughly 2,000 smaller community water systems across the rest of the state, many of which draw on groundwater shaped by more than a century of mining and industrial activity.

Key Findings for Pennsylvania

Reviewing EPA SDWIS data for 2026, a few themes stand out for Pennsylvania:

  • Legacy Mining Impact: In the historic anthracite and bituminous coal regions of central and western Pennsylvania, acid mine drainage can elevate iron, manganese, and sulfate levels in groundwater sources used by smaller systems.
  • PFAS Near Military Sites: Current and former military installations, including bases in Bucks and Montgomery counties, have been associated with PFAS detections in nearby public and private water supplies due to historical use of firefighting foam.
  • System Fragmentation: Pennsylvania has one of the highest counts of small community water systems in the country, and smaller systems generally have fewer resources for monitoring, upgrades, and compliance staff.

Most Common Contaminants in Pennsylvania

Here are the contaminants most relevant to Pennsylvania residents:

1. Iron and Manganese

These naturally occurring minerals are common in groundwater across former coal-mining regions. While primarily an aesthetic issue (taste, staining, discoloration), high manganese levels have also drawn increased health-based scrutiny in recent years.

2. PFAS ("Forever Chemicals")

Pennsylvania has been an active state in PFAS monitoring, with multiple public water systems near military airfields required to install treatment or switch sources after detections exceeded federal health advisories.

3. Disinfection Byproducts and Coliform

Smaller systems using surface water sources with older treatment infrastructure can see elevated trihalomethanes (TTHMs) and haloacetic acids (HAA5), particularly during warmer months when organic matter in source water increases.

Pennsylvania's Best and Worst Cities for Water Quality

Explore the full list on our Pennsylvania water systems page.

Top Performers: Large urban utilities in Philadelphia and Pittsburgh benefit from significant capital investment, professional staff, and modern treatment trains, generally posting strong compliance records.

Areas to Watch: Small rural systems in the Appalachian coal belt and communities near current or former military airfields are the ones most likely to show up in iron/manganese or PFAS-related monitoring data.

What Pennsylvania Residents Should Do

Given Pennsylvania's 31st place ranking, here's what matters most for residents:

  1. Look Up Your Water System: Use the WaterQ search tool to find your specific system's violation history and recent contaminant data.
  2. Check for PFAS Advisories: If you live near a current or former military base, check whether your water provider has published PFAS test results or installed treatment.
  3. Test Private Wells: Roughly a third of Pennsylvania households rely on private wells, which are not regulated under the Safe Drinking Water Act — annual testing for bacteria, iron, manganese, and (where relevant) PFAS is recommended.
  4. Consider Point-of-Use Filtration: An activated carbon filter can help with taste and some organic contaminants, while reverse osmosis is more effective against PFAS and dissolved minerals.

Frequently Asked Questions

How does Pennsylvania water quality compare to other states?

Pennsylvania ranks 31st in the nation for 2026. The state's challenges stem largely from its sheer number of small, independently operated water systems and a legacy of mining and industrial land use that affects groundwater in parts of the state.

What are the most common contaminants in Pennsylvania tap water?

Common concerns in Pennsylvania include Iron and Manganese (from acid mine drainage affecting groundwater in former coal regions), PFAS (linked to firefighting foam use at current and former military airfields), and Total Coliform / Disinfection Byproducts in some smaller systems.

Is it safe to drink tap water in Pennsylvania?

Most Pennsylvanians, including residents of Philadelphia and Pittsburgh, are served by large utilities that meet federal standards. The greater variability is among the state's roughly 2,000 smaller community water systems, where infrastructure age and local geology play a bigger role — checking your specific system's record is the best way to know your situation.

Source: Pennsylvania Department of Environmental Protection Safe Drinking Water Program, EPA SDWIS 2026 Compliance Data, and WaterQ National Database. For more information on our ranking process, visit our state rankings page.