Tap water in El Monte, CA — ZIP 91731
4 public water systems serving about 338,495 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 91731
San Gabriel Valley Water Co.-El Monte
PWSID CA1910039 · serves 240,000 ·
groundwater
0 health-based / 0 total violations (5 yrs)
· PFAS up to 10 ppt
Cal/Am Water Company - San Marino
PWSID CA1910139 · serves 48,065 ·
surface water
0 health-based / 0 total violations (5 yrs)
· PFAS up to 5.3 ppt
Gswc-South Arcadia
PWSID CA1910212 · serves 27,430 ·
groundwater
0 health-based / 0 total violations (5 yrs)
· PFAS up to 22 ppt — above federal limit
El Monte-City, Water Dept.
PWSID CA1910038 · serves 23,000 ·
groundwater
0 health-based / 0 total violations (5 yrs)
· PFAS up to 4.4 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