Tap water in Herndon, VA — ZIP 20120
2 public water systems serving about 1,456,421 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 20120
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
Loudoun Water - Central System
PWSID VA6107350 · serves 334,808 ·
surface water
0 health-based / 1 total violations (5 yrs)
· PFAS up to 3.4 ppt
Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology