Tap Water Results

Is Pleasanton, CA tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

City of Pleasanton, the largest system here, had PFAS above the 2024 federal limits (PFOA, PFOS, PFHxS, PFAS Hazard Index) in EPA's 2023–2025 testing.

Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility issues a boil-water or do-not-drink notice, follow it.

3 public water systems serve parts of Pleasanton. The largest, City of Pleasanton, serves 76,689 people, and 2 systems here had PFAS above a federal limit. Your water bill names your system.

Largest system

City of Pleasanton

76,689 people · Purchased surface water · EPA ID CA0110008

Buys treated water from Zone 7 Water Agency.

PFASHighest averageLimitStatus
PFOA
Above limit
4.95 ppt4 pptAbove limit
PFOS
Above limit
24 ppt4 pptAbove limit
PFHxS
Above limit
20 ppt10 pptAbove limit
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

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.

For context: the PFOA average is higher than at 88% of the California systems EPA tested, the PFOS average is higher than at 97% of the California systems EPA tested and the PFHxS average is higher than at 99% of the California systems EPA tested.

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

Full City of Pleasanton results

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.

Pleasanton homes and lead pipes

40%
of homes built before 1980 (California 56%, US 50%)
3%
built before 1950 (California 14%)
33%
of households rent (California 44%)

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 Pleasanton city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Pleasanton

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Dublin 3 mi
East Bay Municipal Utility District
East Bay Municipal Utility DistrictNone above limits0 ppb
Livermore 7 mi
City of Livermore
City of LivermoreNone above limits0 ppb
San Ramon 7 mi
East Bay Municipal Utility District
East Bay Municipal Utility DistrictNone above limits0 ppb
Union City 9 mi
Alameda County Water District
Alameda County Water DistrictNone above limits0 ppb
Danville 11 mi
East Bay Municipal Utility District
East Bay Municipal Utility DistrictNone above limits0 ppb
Fremont 12 mi
Alameda County Water District
Alameda County Water DistrictNone above limits0 ppb
Pleasanton ZIP codes (2)
  • 94566
  • 94588

Questions

Is Pleasanton tap water safe to drink?

City of Pleasanton has had no health-based violations since 2016, and EPA testing found PFAS above the 2024 federal limits, which it must meet by 2029. 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 Pleasanton, CA?

3 public water systems serve parts of Pleasanton. The largest is City of Pleasanton (76,689 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Pleasanton tap water have PFAS?

Yes. EPA's 2023–2025 testing found entry-point averages above the 2024 federal limits for PFOA and PFOS and PFHxS and PFAS Hazard Index at City of Pleasanton. Systems have until 2029 to meet them.

Do Pleasanton homes have lead pipes?

Census estimates put 40% of Pleasanton 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. City of Pleasanton'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.