Tap Water Results

Is Vacaville, CA tap water safe?

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

Summary

City of Vacaville, the largest system here, had PFAS above the 2024 federal limits (PFOS) 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 Vacaville. The largest, City of Vacaville, serves 99,650 people, and one system here had PFAS above a federal limit. Your water bill names your system.

Largest system

City of Vacaville

99,650 people · Surface water · EPA ID CA4810008

Buys treated water from City of Fairfield.

PFASHighest averageLimitStatus
PFOA
One sample above limit
2.55 ppt4 pptOne sample above limit
PFOS
Above limit
9.9 ppt4 pptAbove limit
PFHxS
Detected, below limit
9.15 ppt10 pptDetected, below 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 PFOS average is higher than at 89% of the California systems EPA tested.

Lead: 0 ppb at the 90th percentile (Nov 2026, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Full City of Vacaville 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.

Vacaville homes and lead pipes

39%
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 Vacaville city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Vacaville

  • Suisun-Solano Water Authority
    29,105 people · Surface water · California · reported ZIPs here
    Total trihalomethanes (TTHM) violations
  • California State Prison – Solano Water System
    3,882 people · Surface water · California · reported ZIPs here
    Total trihalomethanes (TTHM) violation

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Fairfield 8 mi
City of Fairfield
City of FairfieldNone above limits0 ppb
Napa 18 mi
City of Napa
City of NapaNone above limits0 ppb
Davis 18 mi
City of Davis
City of DavisNone above limits0 ppb
Benicia 22 mi
City of Benicia
City of BeniciaNone above limits2.3 ppb
Vallejo 24 mi
City of Vallejo
City of VallejoNone above limits0 ppb
Pittsburg 24 mi
City of Pittsburg
City of PittsburgNone above limits0 ppb
Vacaville ZIP codes (1)
  • 95687

Questions

Is Vacaville tap water safe to drink?

City of Vacaville 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 Vacaville, CA?

3 public water systems serve parts of Vacaville. The largest is City of Vacaville (99,650 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Vacaville tap water have PFAS?

Yes. EPA's 2023–2025 testing found entry-point averages above the 2024 federal limits for PFOS at City of Vacaville. Systems have until 2029 to meet them.

Do Vacaville homes have lead pipes?

Census estimates put 39% of Vacaville 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 Vacaville'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.