Arizona Water Quality Report
Tap water quality data for 12 cities in Arizona, updated 2026.
US average: 100 ppm
1 of 12 cities violation-free
12 cities tested
12 water systems tracked
Cleanest Tap Water in Arizona
Cities with the fewest water quality issues
Tempe
165K served
Glendale
241K served
Peoria
199K served
Scottsdale
242K served
Phoenix
1.7M served
Surprise
202K served
Mesa
466K served
Gilbert
248K served
Casa Grande
141K served
Chandler
270K served
Most Water Quality Issues in Arizona
Cities with the most violations and concerns
Yuma
151K served
Tucson
892K served
Chandler
270K served
Casa Grande
141K served
Gilbert
248K served
Mesa
466K served
Surprise
202K served
Phoenix
1.7M served
Scottsdale
242K served
Peoria
199K served
Water Hardness Across Arizona
Not sure what your hardness means? Use our Water Hardness Calculator or find the best hardness test kits.
Arizona Tap Water: What You Need to Know
Arizona has 12 tracked water utilities serving approximately 4.9M residents. The average water hardness is 214 ppm (12.5 GPG), classified as Very Hard — above the national average of 100 ppm. Hardness ranges from 92.5 ppm in Tucson to 252.5 ppm in Mesa.
In the past 3 years, 11 of 12 cities in Arizona have recorded water quality violations, totaling 1378 violations (197 health-based). All 12 tested cities have lead levels below the EPA action level of 15 ppb.
With very hard water on average, many Arizona residents may notice mineral buildup on fixtures, dry skin, or stiff-feeling hair. A shower filter for hard water can help reduce chlorine exposure, while a water softener addresses the mineral buildup directly.
Frequently Asked Questions About Arizona Water
Is tap water safe to drink in Arizona?
Most tap water in Arizona meets EPA standards, but 11 cities have recorded violations in the past 3 years (197 health-based). We recommend checking your specific city's report on TapWater.org and considering a home water test.
How hard is the water in Arizona?
Arizona's average water hardness is 214 ppm (12.5 GPG), classified as Very Hard. This is above the national average of 100 ppm. Hardness varies significantly by city — use our Water Hardness Calculator to check your specific area.
Which city in Arizona has the cleanest tap water?
Based on EPA violation data, lead testing, and water quality metrics, Tempe ranks as having the cleanest tap water in Arizona. It has zero violations in the past 3 years and lead levels well below the EPA action level.
Which city in Arizona has the most water quality issues?
Yuma currently has the most water quality concerns in Arizona, with 446 violations in the past 3 years. Residents should check their city's detailed water quality report and consider using a certified water filter.
Where does Arizona get its water from?
The majority of Arizona's water systems (17%) use surface water as their primary source. Surface water comes from rivers, lakes, and reservoirs. Each city's specific source can vary — check individual city reports for details.
All 12 Cities
Sorted by population served
Phoenix
Utility serves 1.7M
Tucson
Utility serves 892K
Mesa
Utility serves 466K
Chandler
Utility serves 270K
Gilbert
Utility serves 248K
Scottsdale
Utility serves 242K
Glendale
Utility serves 241K
Surprise
Utility serves 202K
Peoria
Utility serves 199K
Tempe
Utility serves 165K
Yuma
Utility serves 151K
Casa Grande
Utility serves 141K