Arizona Water Quality Ratings

TapWaterSafety has rated 29 public water systems in Arizona, serving a combined 10,680,472 residents. The statewide average grade is D.

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
State average grade
D
61/100
Total utilities rated 29
Population served 10,680,472
Most recent test 2024
🇪🇺 Would fail EU standards 1 of 29

Top water quality concerns in Arizona

  • Arsenic significantly above health guideline
  • Haloacetic acids (HAA9) significantly above health guideline
  • Total trihalomethanes (TTHMs) significantly above health guideline
  • Chromium (hexavalent) significantly above health guideline
  • Chromium-6 detected

Cities in Arizona

Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.

APACHE JUNCTION
D 62,055
AVONDALE
F 83,001
CASA GRANDE
D 134,432
CHANDLER
F 247,328
Cave Creek
D 1,660,000
Chandler
B 261,000
FLAGSTAFF
D 76,960
GILBERT
F 247,600
GLENDALE
F 234,766
Gilbert
C 268,000
Glendale
C 248,000
JOHNSON RANCH
F 87,435
LAKE HAVASU CITY
F 54,610
LITCHFIELD PARK
F 55,810
MARICOPA
F 84,000
MESA
D 466,000
Mesa
C 518,000
PEORIA
D 187,676
PHOENIX
F 1,695,000
PRESCOTT VALLEY
D 57,048
Paradise Valley
D 1,660,000
Phoenix
D 3,340,000
QUEEN CREEK
D 95,502
SCOTTSDALE
F 241,361
SURPRISE
D 127,718
Scottsdale
C 258,000
TEMPE
F 165,000
TUCSON
D 732,906
Tucson
C 548,000
YUMA
D 103,264

Grade distribution

A
0 (0%)
B
3 (10%)
C
3 (10%)
D
19 (66%)
F
4 (14%)

All rated utilities in Arizona

Sorted by score, highest first. Click any utility to see the full grade card.

Rank Utility City Population Score Grade
#1 Chandler Department of Public Works Chandler 261,000 80 B
#2 Scottsdale Municipal Water System Scottsdale 258,000 76 B
#3 City of Mesa Water Department Mesa 518,000 75 B
#4 Gilbert Municipal Water System Gilbert 268,000 74 C
#5 Glendale Department of Public Works Glendale 248,000 74 C
#6 Tucson Department of Public Works Tucson 548,000 70 C
#7 ARIZONA WATER CO - APACHE JUNCTION APACHE JUNCTION 62,055 63 D
#8 TOWN OF PRESCOTT VALLEY PRESCOTT VALLEY 57,048 63 D
#9 Phoenix Water Authority Phoenix 1,680,000 63 D
#10 FLAGSTAFF CITY OF FLAGSTAFF 76,960 62 D
#11 City of Phoenix Water Services Department Phoenix 1,660,000 62 D
#12 EPCOR - AGUA FRIA SURPRISE 127,718 62 D
#13 ARIZONA WATER CO - PINAL VALLEY CASA GRANDE 134,432 61 D
#14 CITY OF YUMA YUMA 103,264 61 D
#15 QUEEN CREEK TOWN OF QUEEN CREEK 95,502 60 D
#16 MESA CITY OF MESA 466,000 60 D
#17 PEORIA CITY OF PEORIA 187,676 60 D
#18 TUCSON CITY OF TUCSON 732,906 60 D
#19 PHOENIX CITY OF PHOENIX 1,695,000 59 D
#20 LAKE HAVASU CITY OF LAKE HAVASU CITY 54,610 58 D
#21 EPCOR - SAN TAN JOHNSON RANCH 87,435 58 D
#22 GW SANTA CRUZ WATER CO MARICOPA 84,000 58 D
#23 CHANDLER CITY OF CHANDLER 247,328 57 D
#24 GLENDALE CITY OF GLENDALE 234,766 57 D
#25 SCOTTSDALE CITY OF SCOTTSDALE 241,361 57 D
#26 LIBERTY WATER LPSCO LITCHFIELD PARK 55,810 49 F
#27 AVONDALE CITY OF AVONDALE 83,001 47 F
#28 GILBERT, TOWN OF GILBERT 247,600 47 F
#29 TEMPE CITY OF TEMPE 165,000 47 F