Is Fairfield, CA tap water safe?

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

City of Fairfield has 1 unresolved health-based violation on record.

Is it an emergency? No: these findings are about longer-term exposure, 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.

5 public water systems serve parts of Fairfield. The largest, City of Fairfield, serves 120,720 people. Your water bill names your system.

Largest system

City of Fairfield

120,720 people · Surface water · EPA ID CA4810003

PFAS	Highest average	Limit	Status
PFOA Not detected	–	4 ppt	Not detected
PFOS Not detected	–	4 ppt	Not detected
PFHxS Not detected	–	10 ppt	Not detected
PFNA Not detected	–	10 ppt	Not detected
HFPO-DA (GenX) Not detected	–	10 ppt	Not 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.

Lead: 0 ppb at the 90th percentile (Dec 2023, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 1

Full City of Fairfield 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.

Fairfield homes and lead pipes

38%

of homes built before 1980 (California 56%, US 50%)

built before 1950 (California 14%)

39%

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 Fairfield 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 Fairfield
City of Fairfield 120,720 people	94533, 94534
California Water Service – Travis AFB 18,111 people	94535

Other water systems serving Fairfield

Suisun-Solano Water Authority
29,105 people · Surface water · California · reported ZIPs here
Total trihalomethanes (TTHM) violations
California Water Service – Travis AFB
18,111 people · Purchased surface water · California · reported ZIPs here
No PFAS above limits
Kohala Ranch Water Company
850 people · Groundwater · Hawaii · reported ZIPs here
Lead near 2027 level
Sid – Blue Ridge Oaks Water System
63 people · Purchased surface water · California · reported ZIPs here
Not in EPA's PFAS sample

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Vacaville 8 mi City of Vacaville	City of Vacaville	Above limit	0 ppb
Benicia 15 mi City of Benicia	City of Benicia	None above limits	2.3 ppb
Napa 15 mi City of Napa	City of Napa	None above limits	0 ppb
Vallejo 16 mi City of Vallejo	City of Vallejo	None above limits	0 ppb
Pittsburg 18 mi City of Pittsburg	City of Pittsburg	None above limits	0 ppb
Martinez 19 mi East Bay Municipal Utility District	East Bay Municipal Utility District	None above limits	0 ppb

Questions

Is Fairfield tap water safe to drink?

City of Fairfield had 1 health-based violation 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 Fairfield, CA?

5 public water systems serve parts of Fairfield. The largest is City of Fairfield (120,720 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Fairfield tap water have PFAS?

None detected above EPA's reporting limits. City of Fairfield 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 Fairfield homes have lead pipes?

Census estimates put 38% of Fairfield 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 Fairfield'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.