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
Los Angeles has the better EPA record — grade A (100/100) vs grade A (96/100).
LOS ANGELES-CITY, DEPT. OF WATER & POWER · serves 3,875,566
LAS VEGAS VALLEY WATER DISTRICT · serves 1,539,277
| Metric | Los Angeles | Las Vegas |
|---|---|---|
| Grade / score | A · 100/100 | A · 96/100 |
| 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) | 2.1 ppb (2023–2025) |
| PFAS detected (UCMR5 2023–2026) | None detected | PFHxA, PFPeA |
| Primary water source | Surface water | Purchased surface water |
| Population served | 3,875,566 | 1,539,277 |
| EPA PWSID | CA1910067 | NV0000090 |
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.
Waterdrop 10UA Under-Sink · NSF 42 · 3-min install · ~$40 →Chlorine & taste. Amazon affiliate link — we may earn a commission at no extra cost to you.
Los Angeles — it scores 100/100 (grade A) against 96/100 (grade A) on EPA records. Neither system has a health-based EPA violation in the last five years
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.
Las Vegas grades A (96/100): no health-based EPA violations in the last five years, lead 90th percentile 2.1 ppb, PFAS detected (PFHxA, PFPeA).