States › Arizona

Arizona Tap Water Quality 2026

EPA drinking water data for 339 cities across Arizona — covering lead levels, violation history, and compliance status.

Systems tracked: 271 Cities covered: 339 Updated: 2026 Q2
B

Arizona earns a B for overall water quality

339 communities across 15 counties and 271 water systems. 81.4% have no open violations.

Median lead where detected: 1.25 ppb
56.3% of systems report lead as not detected — a state filing convention, not a water quality measure
PFAS tested at 46.0% of communities; 18 above the federal limit
Lead reported for 100.0% of communities
81.4% of communities have no open violations
Water Systems
271
Active community systems
Median Lead Level
1.25 ppb
8% of EPA action level
Fully Compliant
81.4%
of systems — no active violations
How we grade states Grades are based on actual EPA enforcement data — MCL violations and lead levels measured against the 15 ppb federal action level. We do not use MCLG-based detections, which are aspirational zero-tolerance goals that would make nearly every state look dangerous. Read our full methodology →

Best & Worst Cities in Arizona

✓ Cleanest Water
Crystal Beach
Mohave County
0.0 ppb B
Elephant Head
Pima County
0.0 ppb B
McConnico
Mohave County
0.0 ppb A
Tucson
Pima County
0.7 ppb A
Glendale
Maricopa County
1.6 ppb A
Scottsdale
Maricopa County
2.3 ppb A
⚠ Needs Attention
Village of Oak Creek (Big Park)
Yavapai County
0.0 ppb F
San Carlos
Gila County
5.0 ppb F
Bylas
Graham County
5.0 ppb F
Peridot
Graham County
5.0 ppb F
Fort Apache
Navajo County
1.0 ppb F
Whiteriver
Navajo County
1.0 ppb F

Water Quality by County

15 of 15
Sort:
CountySystemsLead LevelViolationsGrade
Maricopa County 40 2.3 ppb 0 B
Mohave County 37 1.2 ppb 0 B
Pima County 36 0.7 ppb 0 A
Gila County 35 5.0 ppb 0 B
Navajo County 34 1.0 ppb 0 C
Pinal County 28 1.5 ppb 0 B
Yavapai County 25 5.1 ppb 0 B
Coconino County 25 5.0 ppb 0 B
Cochise County 20 2.2 ppb 0 B
Yuma County 16 1.1 ppb 0 B

About Arizona Drinking Water

Arizona is served by 271 community water systems covering 339 communities across 15 counties. 81.4% have no open violation on record.

Lead was detected in 148 communities, with a median of 1.25 ppb — 8% of the federal action level. A further 191 reported none detected. That share is a state reporting convention rather than a measure of water quality, so it is stated separately rather than averaged in.

PFAS has been tested at 46.0% of communities here, and 18 are above the limits EPA set in 2024. Coverage matters: states that test more find more, so this figure is not comparable with a state that has tested less.

Frequently Asked Questions

Is Arizona tap water safe to drink? ▼
81.4% of communities have no open violation on record. 18 have PFAS above the federal limit set in 2024, which is the main open concern.
Does Arizona have a lead problem? ▼
10 water systems report a 90th-percentile lead result at or above the 15 ppb action level. The action level is a treatment trigger, not a legal maximum, and 191 communities report no detection at all.
How complete is the data for Arizona? ▼
Lead results are reported for 100.0% of communities and PFAS for 46.0%. Where a figure is missing it is shown as not reported rather than assumed safe.
How does Arizona compare with other states? ▼
We do not rank states against each other. Lead reporting completeness ranges from under 20% to 100% depending on the state, so a national ranking would compare filing practice rather than water quality.