Tap water in Herndon, VA — ZIP 22204
2 public water systems serving about 1,336,613 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 22204
Fairfax County Water Authority
PWSID VA6059501 · serves 1,121,613 ·
surface water
0 health-based / 0 total violations (5 yrs)
· PFAS up to 21.5 ppt — above federal limit
Arlington County
PWSID VA6013010 · serves 215,000 ·
surface water
0 health-based / 0 total violations (5 yrs)
· PFAS up to 4.5 ppt
Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology