Is San Dimas, California tap water safe?
4 water systems report serving San Dimas. Your water depends on which one serves your address. Check your bill if unsure. This list is matched from the ZIP codes in this place, so it may include nearby systems.
B
Gswc-San Dimas
Serves 56,564 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2026).
A
LA Verne, City WD
Serves 31,334 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A
Three Valleys MWD
Population not reported (often a wholesaler) · Surface water · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file.
A
Metropolitan Water Dist. of So. Cal.
Population not reported (often a wholesaler) · Surface water · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file.