Tap water in Riverhead (T), NY — ZIP 11901
2 public water systems serving about 1,135,000 people. PFAS "forever chemicals" have been detected here.
F
Failing
PFAS detected: at least one system serving this ZIP reported PFAS in EPA UCMR 5
testing. Levels and the 2024 federal limits are shown per system below.
Water systems serving 11901
Suffolk County Water Authority
PWSID NY5110526 · serves 1,100,000 ·
groundwater
0 health-based / 0 total violations (5 yrs)
· PFAS up to 43.5 ppt — above federal limit
Riverhead Water District
PWSID NY5103705 · serves 35,000 ·
groundwater
1 health-based / 2 total violations (5 yrs)
· PFAS up to 5.2 ppt — above federal limit
Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology