Safest Drinking Water in Pennsylvania 2026
Pennsylvania has 5 public water systems serving 2,789,548 people. The safest system is Chester Water Authority in Chester with a score of 100/100.
Top 5 Water Systems in Pennsylvania
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Chester Water Authority | Chester | 140,437 | Surface water | 0 | A (100) |
| 2 | Pa Amer Water Co Lake Scranton | Wilkes Barre | 134,570 | Surface water | 0 | A (100) |
| 3 | North Penn Water Authority | Lansdale | 91,941 | Surface water | 0 | A (100) |
| 4 | Philadelphia Water Department | Philadelphia | 1,600,000 | Surface water | 0 | C (70) |
| 5 | Aqua Pa Main System | Bryn Mawr | 822,600 | Surface water | 2 | F (59) |
Water quality data for Pennsylvania is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Chester Water Authority in Chester has the highest Water Safety Score in Pennsylvania at 100/100 (Grade A), serving 140,437 people.
Pennsylvania has 5 public water systems serving 2,789,548 people. The average Water Safety Score is 86/100.
The Water Safety Score (0-100) is based on health violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Higher scores mean cleaner, safer water.
Water Safety Score: health violations (40%), contaminant exceedances (30%), enforcement history (20%), monitoring violations (10%).