State water index

Arizona water hardness

Search 133 indexed communities and 285 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.

Median indexed hardness

241PPM

Very Hard

Indexed range 66.4–1250 PPM

ZIP profiles: 285
Cities: 133
Matched utilities: 434
Counties: 15

Understanding Arizona

Why local comparisons matter here

Arizona crosses the Colorado Plateau, central highlands, and Basin and Range deserts. Communities may use Colorado River water, reservoirs, deep basin groundwater, or changing blends.

In this index, very hard is the largest category, covering 247 of 285 profiles with hardness data. The state median is 241 PPM, but the full indexed range is 66.4–1250 PPM.

State distribution

Hardness across indexed ZIPs

Counts describe published ZIP profiles, not a population-weighted statewide sample.

Soft · 0–60 PPM0

Moderately hard · 61–120 PPM31

Hard · 121–180 PPM7

Very hard · 181+ PPM247

Evidence coverage

What the current records support

Hardness estimate: 100%
Lead 90th percentile: 100%
Copper 90th percentile: 6%

Low-confidence hardness profiles

Nearest site more than 25 miles away

Reported source water

Utility source mix

Groundwater: 396
Surface water: 38

Highest medians

Hardest indexed cities

Lowest medians

Softest indexed cities

City directory

Explore Arizona by city

Search by city or county, then sort by name, hardness, or ZIP coverage.

133 cities · 285 ZIP profiles

Search city or county

County

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133 cities found

Page 1 of 6

Aguila

Maricopa County · 1 ZIP

243PPM

Single indexed value1 active record

Ajo

Pima County · 1 ZIP

150PPM

County	Median	Range	ZIP profiles
Yuma County	393 PPM	390–450	7
La Paz County	385 PPM	282–501.5	6
Mohave County	304 PPM	293–560	10
Navajo County	286 PPM	114.5–328	8
Coconino County	268 PPM	247.5–289	12
Gila County	263 PPM	209.5–575	5
Yavapai County	248 PPM	154.5–267	20
Pima County	245 PPM	150–245.5	35
Cochise County	245 PPM	242.5–340.5	15
Santa Cruz County	245 PPM	245–245	5
Pinal County	243 PPM	68–323.5	21
Maricopa County	211 PPM	97–580	127

Why local comparisons matter here

Hardness across indexed ZIPs

What the current records support

Utility source mix

Hardest indexed cities

Softest indexed cities

Explore Arizona by city

Aguila

Ajo

Alpine

Apache Junction

Arivaca

Avondale

Bagdad

Bellemont

Benson

Bisbee

Bouse

Bowie

Buckeye

Cameron

Camp Verde

Carefree

Casa Grande

Cave Creek

Chandler

Chino Valley

Chloride

Cibola

Clarkdale

Clay Springs

Highest indexed county medians