Is Sierra Vista, 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 Bella Vista City Water System. 1 PFAS were detected below the limits.

13 public water systems serve parts of Sierra Vista. The largest, Bella Vista City Water System, serves 20,045 people, and one system here had PFAS above a federal limit. Your water bill names your system.

Largest system

Bella Vista City Water System

20,045 people · Groundwater · EPA ID AZ0402010

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

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.

Sierra Vista homes and lead pipes

28%

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

built before 1950 (Arizona 3%)

38%

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 Sierra Vista 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 Sierra Vista
Bella Vista City Water System 20,045 people	85635
US Army Fort Huachuca Water System 15,603 people	85613

Other water systems serving Sierra Vista

US Army Fort Huachuca Water System
15,603 people · Groundwater · Arizona · reported ZIPs here
PFOA above limitAlso: PFOS above limit · PFHxS detected · 1 health-based violation since 2016
Pueblo del Sol Water Company
12,804 people · Groundwater · Arizona · lists this city
Coliform bacteria violations
Arizona Water Company – Sierra Vista
9,233 people · Groundwater · Arizona · lists this city
No PFAS above limitsAlso: 1 health-based violation since 2016
Bella Vista Water South
2,178 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample
East Slope Water Company
2,012 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample
Southland Utilities – Golden Acres
1,635 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 3 health-based violations since 2016

6 more systems

Southern Sunrise Water Company Cochise Horseshoe
1,588 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample
East Slope Water – West
655 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Sierra Vista Mh Village Water System
328 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Northern Sunrise Water Company Mustang Crystal
315 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample
Cloud Nine Water Company
143 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sampleAlso: 2 health-based violations since 2016
Sulger Water Company 2
67 people · Groundwater · Arizona · lists this city
Not in EPA's PFAS sample

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Sahuarita 46 mi Sahuarita Water Company	Sahuarita Water Company	None above limits	0 ppb
Tucson 52 mi City of Tucson	City of Tucson	None above limits	0.65 ppb
Oro Valley 71 mi Oro Valley Water Utility	Oro Valley Water Utility	None above limits	1 ppb
Marana 79 mi City of Tucson	City of Tucson	None above limits	0.65 ppb
Florence 122 mi Florence Water Company	Florence Water Company	None above limits	0 ppb
Casa Grande 126 mi Arizona Water Company – Pinal Valley	Arizona Water Company – Pinal Valley	None above limits	0 ppb

Questions

Is Sierra Vista tap water safe to drink?

Bella Vista City Water System 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 Sierra Vista, AZ?

13 public water systems serve parts of Sierra Vista. The largest is Bella Vista City Water System (20,045 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Sierra Vista tap water have PFAS?

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

Do Sierra Vista homes have lead pipes?

Census estimates put 28% of Sierra Vista 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. Bella Vista City Water System'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.