Is Flagstaff, AZ 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 Flagstaff. 1 PFAS were detected below the limits.

13 public water systems serve parts of Flagstaff. The largest, City of Flagstaff, serves 79,796 people. Your water bill names your system.

Largest system

City of Flagstaff

79,796 people · Surface water · EPA ID AZ0403008

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: 3.6 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: 0

Full City of Flagstaff results

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.

Flagstaff homes and lead pipes

28%

of homes built before 1980 (Arizona 29%, US 50%)

built before 1950 (Arizona 3%)

58%

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

Other water systems serving Flagstaff

Doney Park Water
9,222 people · Groundwater · Arizona · lists this city
Coliform bacteria violation
Kachina Village Dwid Water System
3,500 people · Groundwater · Arizona · lists this city
No PFAS above limitsAlso: 1 health-based violation since 2016
Forest Highlands Water Company
1,681 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample
Ponderosa Utility Corp
1,585 people · Groundwater · Arizona · lists this city
Coliform bacteria violation
Hidden Hollow Mhc Water System
400 people · Groundwater · Arizona · lists this city
Coliform bacteria violation
Cs Flagstaff Ranch Water Company
350 people · Groundwater · Arizona · lists this city
Arsenic violationsAlso: Coliform bacteria violation

6 more systems

Mountain Dell Water Inc
250 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Cs West Village Water Company
210 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Lake Mary Country Store Water System
130 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Heckethorn Water Company
90 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 2 health-based violations since 2016
A1 Ranch Dwid Water System
45 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample
Lockett Estates Water System
30 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 2 health-based violations since 2016

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Prescott Valley 56 mi Town of Prescott Valley	Town of Prescott Valley	None above limits	0 ppb
Prescott 62 mi City of Prescott	City of Prescott	Above limit	0 ppb
Peoria 104 mi City of Peoria	City of Peoria	None above limits	0 ppb
Scottsdale 104 mi City of Scottsdale	City of Scottsdale	None above limits	2.3 ppb
Phoenix 114 mi City of Phoenix	City of Phoenix	None above limits	2.74 ppb
Surprise 115 mi EPCOR – Agua Fria	EPCOR – Agua Fria	None above limits	0 ppb

Flagstaff ZIP codes (1)

86011

Questions

Is Flagstaff tap water safe to drink?

City of Flagstaff 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 Flagstaff, AZ?

13 public water systems serve parts of Flagstaff. The largest is City of Flagstaff (79,796 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Flagstaff tap water have PFAS?

City of Flagstaff had 1 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Flagstaff homes have lead pipes?

Census estimates put 28% of Flagstaff 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 Flagstaff'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.