Tap Water Results

Arizona tap water quality

835 community water systems serving 7.3 million people.

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

21
systems with PFAS above a federal limit
845,012
people served by them
159
systems EPA tested for PFAS
10
systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years. 1 more systems have no recent lead results in EPA's database.

Water systems with PFAS above the federal limit

Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.

Arizona PFAS report: chart, rankings and data to download →

Largest water systems in Arizona

Arizona cities and towns

Most health-based violations since 2016

All Arizona utilities on this site

Every Arizona system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 835 systems as CSV.

Questions

Does Arizona tap water have PFAS?

EPA tested 159 community water systems in Arizona for 29 PFAS between 2023 and 2025. 30 had at least one regulated PFAS detected, and 21 had an entry-point average above a 2024 federal limit. Those 21 systems serve about 845,012 people (12% of people on community water in Arizona). Systems have until 2029 to meet the limits.

How many Arizona water systems have violations?

442 systems in Arizona had at least one health-based violation since 2016 (2,134 violations in total). 626 violations are currently listed as unaddressed.

Which Arizona water systems are over the lead action level?

10 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Another 1 system has no lead results in EPA's database from the last five years. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.