Tap Water Results

Is San Luis, AZ tap water safe?

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

Summary

City of San Luis 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.

City of San Luis supplies San Luis (39,705 people).

Water system

City of San Luis

39,705 people · Groundwater · EPA ID AZ0414005

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
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.

Lead: 1 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 4

Across Arizona, 21 of 159 water systems EPA tested had PFAS above a 2024 federal limit, and 10 systems were above the lead action level in results from the last five years. Arizona results.

San Luis homes and lead pipes

9%
of homes built before 1980 (Arizona 29%, US 50%)
2%
built before 1950 (Arizona 3%)
32%
of households rent (Arizona 33%)

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

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Yuma 12 mi
City of Yuma
City of YumaNone above limits1.1 ppb
Buckeye 138 mi
City of Buckeye – Valencia Town Division
City of Buckeye – Valencia Town DivisionNone above limits0 ppb
Lake Havasu City 141 mi
City of Lake Havasu
City of Lake HavasuNone above limits3.1 ppb
Goodyear 147 mi
Goodyear Water Department
Goodyear Water DepartmentAbove limit0 ppb
Avondale 151 mi
City of Avondale
City of AvondaleAbove limit0 ppb
Surprise 155 mi
EPCOR – Agua Fria
EPCOR – Agua FriaNone above limits0 ppb
San Luis ZIP codes (2)
  • 85336
  • 85349

Questions

Is San Luis tap water safe to drink?

City of San Luis had 4 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 San Luis, AZ?

City of San Luis, which serves 39,705 people.

Does San Luis tap water have PFAS?

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

Census estimates put 9% of San Luis homes as built before 1980 (Arizona: 29%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of San Luis'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.