County Water Quality Report

Montgomery County, Pennsylvania

4 public water systems serving 1,075,922 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
F
55/100
Utilities rated 4
Population served 1,075,922

Top water quality concerns in Montgomery County

  • Haloacetic acids (HAA9) significantly above health guidelinein 4 of 4 utilities
  • PFAS contaminationin 3 of 4 utilities
  • Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 2 of 4 utilities
  • Arsenic significantly above health guidelinein 2 of 4 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 2 of 4 utilities

All utilities in Montgomery County

Click any utility for full grade card, contaminant data, and treatment plant contact info.

D
64/100

NORTH WALES WATER AUTHORITY

NORTH WALES · 72,496 residents

Top concern: Haloacetic acids (HAA9) significantly above health guideline

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D
59/100

PA AMERICAN NORRISTOWN

NORRISTOWN · 88,885 residents

Top concern: PFAS contamination

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F
50/100

AQUA PA MAIN SYSTEM

BRYN MAWR · 822,600 residents

Top concern: PFAS contamination

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F
47/100

NORTH PENN WATER AUTHORITY

LANSDALE · 91,941 residents

Top concern: PFAS contamination

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