Tap water in San Juan, TX — ZIP 78589
2 public water systems serving about 201,195 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 78589
North Alamo Wsc
PWSID TX1080029 · serves 171,195 ·
surface water
2 health-based / 5 total violations (5 yrs)
· PFAS up to 12.2 ppt
City Of San Juan
PWSID TX1080010 · serves 30,000 ·
surface water
0 health-based / 1 total violations (5 yrs)
· PFAS up to 9.2 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