Tap water in Norwalk, CT — ZIP 06840
2 public water systems serving about 50,353 people. PFAS "forever chemicals" have been detected here.
D
Poor
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 06840
Norwalk First Taxing District
PWSID CT1030011 · serves 40,256 ·
surface water
0 health-based / 1 total violations (5 yrs)
· PFAS up to 11.2 ppt — above federal limit
Aquarion-New Canaan
PWSID CT0900011 · serves 10,097 ·
surface water
0 health-based / 0 total violations (5 yrs)
· PFAS up to 5.6 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