Loading water data...
Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Side-by-side EPA records for the two public water systems · EPA SDWIS/ECHO 2026Q2 · UCMR5 (2023–2026, July 2026 release) · SYR4 six-year review 2012–2019 · methodology
No EPA system match
Not graded: we have not matched San Francisco to a live EPA public water system. Find its utility report →
LOS ANGELES-CITY, DEPT. OF WATER & POWER · serves 3,875,566
| Metric | San Francisco | Los Angeles |
|---|---|---|
| Grade / score | Not graded | A · 100/100 |
| Health-based EPA violations, last 5 yrs | no data | 0 |
| Health-based violations unresolved | no data | 0 |
| Monitoring / reporting violations, last 5 yrs | no data | 0 |
| Lead 90th percentile (action level 15 ppb) | no data | 3.9 ppb (2021–2023) |
| PFAS detected (UCMR5 2023–2026) | not sampled | None detected |
| Primary water source | Not reported | Surface water |
| Population served | no data | 3,875,566 |
| EPA PWSID | no data | CA1910067 |
Green = the better value where the two systems differ. Lead and PFAS figures describe water leaving the plant, not any individual tap.
We can only grade Los Angeles: San Francisco has not been matched to an EPA water system, so a fair comparison is not possible yet.
San Francisco is not yet matched to an EPA water system; check the utility's Consumer Confidence Report.
Los Angeles grades A (100/100): no health-based EPA violations in the last five years, lead 90th percentile 3.9 ppb, no PFAS detected.