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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
Both cities score 100/100 (grade A) on EPA records.
LOS ANGELES-CITY, DEPT. OF WATER & POWER · serves 3,875,566
SEATTLE PUBLIC UTILITIES · serves 1,161,961
| Metric | Los Angeles | Seattle |
|---|---|---|
| Grade / score | A · 100/100 | A · 100/100 |
| Health-based EPA violations, last 5 yrs | 0 | 0 |
| Health-based violations unresolved | 0 | 0 |
| Monitoring / reporting violations, last 5 yrs | 0 | 0 |
| Lead 90th percentile (action level 15 ppb) | 3.9 ppb (2021–2023) | 1.6 ppb (2025–2025) |
| PFAS detected (UCMR5 2023–2026) | None detected | None detected |
| Primary water source | Surface water | Surface water |
| Population served | 3,875,566 | 1,161,961 |
| EPA PWSID | CA1910067 | WA5377050 |
Green = the better value where the two systems differ. Lead and PFAS figures describe water leaving the plant, not any individual tap.
Water with a clean EPA record still benefits from a carbon filter for chlorine, taste and odor.
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They tie at 100/100 (grade A) on EPA records; the tables below show where the two systems differ.
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.
Seattle grades A (100/100): no health-based EPA violations in the last five years, lead 90th percentile 1.6 ppb, no PFAS detected.