💧 ZIP Water Report

Tap water in Niwot, CO — ZIP 80503

3 public water systems serving about 150,112 people. PFAS "forever chemicals" have been detected here.

C
Fair
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 80503

Longmont City Of
PWSID CO0107485 · serves 104,178 · surface water
0 health-based / 2 total violations (5 yrs)
A
Little Thompson Wd
PWSID CO0135477 · serves 25,654 · surface water
0 health-based / 0 total violations (5 yrs) · PFAS up to 4.8 ppt — above federal limit
C
Left Hand Wd
PWSID CO0107471 · serves 20,280 · surface water
0 health-based / 0 total violations (5 yrs)
A

Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology