Is Covina, 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 Suburban Water Systems-San Jose. 4 PFAS were detected below the limits.
5 public water systems serve parts of Covina. The largest, Suburban Water Systems-San Jose, serves 170,523 people, and one system here had PFAS above a federal limit. Your water bill names your system.
Largest system
Suburban Water Systems-San Jose
170,523 people · Purchased surface water · EPA ID CA1910205
Buys treated water from La Puente Valley County Water District, Valley County Water District, Covina Valley Water Company – Wholesale, City of Pomona Water Dept., Rowland Water District, Walnut Valley 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 2025, 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.
Covina 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 Covina city (tables B25034, B25003). Estimates for small places have a margin of error.
Which system serves your ZIP code
Based on the ZIP codes each system reported serving. Boundaries don't follow ZIP lines exactly, so your water bill is the final word.
| System | ZIP codes in Covina |
|---|---|
| Suburban Water Systems-San Jose 170,523 people | 91723 |
| Golden State Water Company – San Dimas 56,564 people | 91724 |
| City of Covina Water Dept. 33,300 people | 91722 |
Other water systems serving Covina
- Walnut Valley Water District100,941 people · Purchased surface water · California · reported ZIPs hereLithium above screening level
- Golden State Water Company – San Dimas56,564 people · Purchased surface water · California · reported ZIPs herePFOS above limitAlso: Lithium above screening level
- City of Covina Water Dept.33,300 people · Purchased surface water · California · lists this cityLithium above screening level
- Valencia Heights Water Company7,775 people · Purchased surface water · California · reported ZIPs herePFOA detectedAlso: PFOS detected · PFHxS detected
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| West Covina 3 mi San Gabriel Valley Water Company – El Monte | None above limits | 0 ppb |
| Azusa 4 mi Azusa Light and Water | None above limits | 0 ppb |
| Walnut 4 mi Suburban Water Systems-San Jose | None above limits | 0 ppb |
| Glendora 4 mi Golden State Water Company – San Dimas | Above limit | 2.1 ppb |
| San Dimas 4 mi Golden State Water Company – San Dimas | Above limit | 2.1 ppb |
| La Puente 6 mi San Gabriel Valley Water Company – El Monte | None above limits | 0 ppb |
Questions
Is Covina tap water safe to drink?
Suburban Water Systems-San Jose 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 Covina, CA?
5 public water systems serve parts of Covina. The largest is Suburban Water Systems-San Jose (170,523 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does Covina tap water have PFAS?
Suburban Water Systems-San Jose had 4 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.
Do Covina homes have lead pipes?
Census estimates put 76% of Covina 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. Suburban Water Systems-San Jose'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.