County Water Quality Report

Nassau County, New York

6 public water systems serving 699,000 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
62/100
Utilities rated 6
Population served 699,000
🇪🇺 Would fail EU standards 1 of 6

Top water quality concerns in Nassau County

  • PFAS contaminationin 6 of 6 utilities
  • Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 3 of 6 utilities
  • Nitrate significantly above health guidelinein 2 of 6 utilities
  • Nitrate and nitrite significantly above health guidelinein 2 of 6 utilities
  • Chromium (hexavalent) significantly above health guidelinein 2 of 6 utilities

All utilities in Nassau County

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

C
72/100

LIBERTY UTILITIES NEW YORK - MERRICK

HEMPSTEAD (T) · 135,000 residents

Top concern: PFAS contamination

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C
68/100

TOWN OF HEMPSTEAD WATER DEPARTMENT

HEMPSTEAD (T) · 110,000 residents

Top concern: PFAS contamination

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C
68/100

JERICHO WD

OYSTER BAY (T) · 58,000 residents

Top concern: PFAS contamination

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D
62/100

HEMPSTEAD (V)

HEMPSTEAD (V) · 56,000 residents

Top concern: PFAS contamination

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F
53/100

LIBERTY UTILITIES NEW YORK - LYNBROOK

HEMPSTEAD (T) · 220,000 residents

Top concern: PFAS contamination

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F
49/100

WA OF WESTERN NASSAU

HEMPSTEAD (T) · 120,000 residents

Top concern: PFAS contamination

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