State water index

Wyoming water hardness

Search 90 indexed communities and 97 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.

Median indexed hardness

235PPM

Very Hard

Indexed range 3.2–1905 PPM

ZIP profiles: 97
Cities: 90
Matched utilities: 196
Counties: 24

Understanding Wyoming

Why local comparisons matter here

Wyoming combines mountain headwaters with broad intermontane basins and sedimentary aquifers. Small systems can be far from the nearest qualifying monitoring site.

In this index, very hard is the largest category, covering 66 of 93 profiles with hardness data. The state median is 235 PPM, but the full indexed range is 3.2–1905 PPM.

State distribution

Hardness across indexed ZIPs

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

Soft · 0–60 PPM7

Moderately hard · 61–120 PPM2

Hard · 121–180 PPM18

Very hard · 181+ PPM66

Evidence coverage

What the current records support

Hardness estimate: 96%
Lead 90th percentile: 100%
Copper 90th percentile: 19%

Low-confidence hardness profiles

Nearest site more than 25 miles away

Reported source water

Utility source mix

Groundwater: 111
Surface water: 80
Groundwater influenced by surface water: 5

Highest medians

Hardest indexed cities

1. Kirby1905 PPM
2. Pavillion1905 PPM
3. Shoshoni1905 PPM
4. Bairoil1435 PPM
5. Worland1190 PPM

Lowest medians

Softest indexed cities

1. Opal3 PPM
2. Laramie10 PPM
3. Farson10 PPM
4. Cheyenne10 PPM
5. Cody53 PPM

City directory

Explore Wyoming by city

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

90 cities · 97 ZIP profiles

Search city or county

County

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90 cities found

Page 1 of 4

Afton

Lincoln County · 1 ZIP

139PPM

Single indexed value1 active record

Albin

Laramie County · 1 ZIP

238PPM

Single indexed value2 active records

Alta

Teton County · 1 ZIP

134PPM

County	Median	Range	ZIP profiles
Hot Springs County	1905 PPM	1905–1905	1
Fremont County	1041 PPM	138–1905	4
Platte County	846 PPM	235–1048	4
Washakie County	747 PPM	304–1190	2
Converse County	516 PPM	336.5–696	2
Laramie County	479 PPM	6.7–769	6
Weston County	468 PPM	292–477	3
Crook County	384 PPM	215–490	4
Johnson County	353 PPM	260–446	2
Niobrara County	310 PPM	305–676	3
Natrona County	292 PPM	224–383	6
Sheridan County	291 PPM	214–339	4

Why local comparisons matter here

Hardness across indexed ZIPs

What the current records support

Utility source mix

Hardest indexed cities

Softest indexed cities

Explore Wyoming by city

Afton

Albin

Alta

Baggs

Bairoil

Basin

Beulah

Buffalo

Burlington

Burns

Byron

Carpenter

Casper

Centennial

Cheyenne

Chugwater

Clearmont

Cody

Cowley

Dayton

Deaver

Dixon

Douglas

Dubois

Highest indexed county medians