Is Folsom, CA tap water safe?

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

No federal limits exceeded in EPA data for City of Folsom – Main.

5 public water systems serve parts of Folsom. The largest, City of Folsom – Main, serves 80,969 people. Your water bill names your system.

Largest system

City of Folsom – Main

80,969 people · Surface water · EPA ID CA3410014

Buys treated water from Golden State Water Company – Cordova, City of Folsom – Ashland.

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 (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 Folsom – Main 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.

Folsom homes and lead pipes

13%

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

built before 1950 (California 14%)

30%

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 Folsom 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 Folsom
City of Folsom – Main 80,969 people	95630
Folsom State Prison Water System 7,399 people	95671

Other water systems serving Folsom

San Juan Water District
29,738 people · Surface water · California · reported ZIPs here
No PFAS above limits
Orange Vale Water Company
16,861 people · Purchased surface water · California · reported ZIPs here
No PFAS above limits
Folsom State Prison Water System
7,399 people · Surface water · California · reported ZIPs here
PFOS detectedAlso: 1 health-based violation since 2016
City of Folsom – Ashland
3,300 people · Purchased surface water · California · lists this city
No PFAS above limits

How nearby cities compare

City	Main water system	PFAS
Rancho Cordova 8 mi California American Water – Suburban Rosemont	California American Water – Suburban Rosemont	Above limit
Citrus Heights 8 mi Sacramento Suburban Water District	Sacramento Suburban Water District	None above limits
Rocklin 11 mi Placer CWA – Foothill	Placer CWA – Foothill	None above limits
Roseville 12 mi City of Roseville	City of Roseville	None above limits
Lincoln 16 mi City of Lincoln	City of Lincoln	None above limits
Sacramento 19 mi City of Sacramento Main	City of Sacramento Main	Above limit

Questions

Is Folsom tap water safe to drink?

City of Folsom – Main 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 Folsom, CA?

5 public water systems serve parts of Folsom. The largest is City of Folsom – Main (80,969 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Folsom tap water have PFAS?

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

Census estimates put 13% of Folsom 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 Folsom – Main'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.