Is La Verne, CA tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for Walnut Valley Water District.
3 public water systems serve parts of La Verne. The largest, Walnut Valley Water District, serves 100,941 people, and one system here had PFAS above a federal limit. Your water bill names your system.
Largest system
Walnut Valley Water District
100,941 people · Purchased surface water · EPA ID CA1910234
Buys treated water from Three Valleys Municipal Water District, Metropolitan Water District of SO. Cal..
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 0 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Across California, 129 of 691 water systems EPA tested had PFAS above a 2024 federal limit, and 26 systems were above the lead action level in results from the last five years. California results.
La Verne homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for La Verne city (tables B25034, B25003). Estimates for small places have a margin of error.
Other water systems serving La Verne
- Golden State Water Company – San Dimas56,564 people · Purchased surface water · California · reported ZIPs herePFOS above limitAlso: Lithium above screening level
- La Verne, City Water District31,334 people · Purchased surface water · California · lists this cityNitrate violation
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| San Dimas 2 mi Golden State Water Company – San Dimas | Above limit | 2.1 ppb |
| Pomona 4 mi City of Pomona Water Dept. | Above limit | 2.1 ppb |
| Glendora 5 mi Golden State Water Company – San Dimas | Above limit | 2.1 ppb |
| Montclair 5 mi Monte Vista Water District | Above limit | 0 ppb |
| Upland 6 mi Cucamonga Valley Water District | None above limits | 0 ppb |
| Covina 7 mi Suburban Water Systems-San Jose | None above limits | 0 ppb |
La Verne ZIP codes (1)
- 91750
Questions
Is La Verne tap water safe to drink?
Walnut Valley Water District has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in La Verne, CA?
3 public water systems serve parts of La Verne. The largest is Walnut Valley Water District (100,941 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does La Verne tap water have PFAS?
None detected above EPA's reporting limits. Walnut Valley Water District had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do La Verne homes have lead pipes?
Census estimates put 62% of La Verne homes as built before 1980 (California: 56%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Walnut Valley Water District's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.