Water Hardness in Wyoming (WY)
Wyoming has an average water hardness of 190 ppm (11.1 grains per gallon), which is classified as Hard . Most households in Wyoming would benefit from a water softener to protect plumbing and appliances from mineral scale buildup. The estimated annual cost of untreated hard water for Wyoming households is approximately $8 per year in extra energy, cleaning products, and premature appliance wear. Water hardness varies between cities — from 125 ppm in Cheyenne to 280 ppm in Gillette.
Water Hardness by City in Wyoming
The table below shows water hardness data for 8 cities in Wyoming, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Gillette | 280 ppm | 16.4 gpg | Very Hard | Ground | 8 | 450 | City of Gillette |
| Rock Springs | 240 ppm | 14 gpg | Hard | Ground | 7.9 | 385 | City of Rock Springs |
| Riverton | 220 ppm | 12.9 gpg | Hard | Ground | 7.8 | 350 | City of Riverton |
| Sheridan | 200 ppm | 11.7 gpg | Hard | Mixed | 7.7 | 320 | City of Sheridan |
| Casper | 180 ppm | 10.5 gpg | Moderately Hard | Surface | 7.6 | 280 | City of Casper |
| Cody | 165 ppm | 9.6 gpg | Moderately Hard | Surface | 7.5 | 260 | City of Cody |
| Laramie | 150 ppm | 8.8 gpg | Moderately Hard | Mixed | 7.5 | 235 | City of Laramie |
| Cheyenne | 125 ppm | 7.3 gpg | Moderately Hard | Mixed | 7.4 | 192 | Cheyenne Board of Public Utilities |
Understanding Water Hardness in Wyoming
Water Sources in Wyoming
Many cities in Wyoming rely on groundwater from wells and aquifers as their primary water source. Groundwater tends to be harder than surface water because it spends more time in contact with limestone, dolomite, and other mineral-rich rock formations deep underground. This prolonged contact allows more calcium and magnesium to dissolve into the water, resulting in higher hardness levels.
Hardness Variation Across Wyoming
Water hardness in Wyoming ranges from 125 ppm in Cheyenne to 280 ppm in Gillette — a difference of 155 ppm. This variation means that treatment recommendations differ significantly between cities. Residents of Gillette and other cities with hard water should seriously consider installing a water softener to protect their homes. At 280 ppm, the annual cost of hard water damage to appliances, plumbing, and increased cleaning product usage can easily exceed $12. Cheyenne has the softest water in the state, though at 125 ppm it still contains some dissolved minerals.
Recommended Treatment for Wyoming Water
Based on the average water hardness of 190 ppm in Wyoming, a water softener is recommended for most households. The most effective treatment options for Wyoming's water hardness level include:
- Salt-Based Water Softener ($800 - $2,500) — Removes hardness minerals. Highly effective.
- Salt-Free Water Conditioner ($1,000 - $3,000) — Conditions water without removing minerals. Moderately effective.
- Reverse Osmosis System ($200 - $500) — Removes hardness minerals. Highly effective.
- Electronic Descaler ($150 - $400) — Conditions water without removing minerals. Moderately effective.
How Wyoming Compares to Other States
Below is a comparison of Wyoming with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| Wyoming (WY) | 190 ppm | Hard | 8 |
| California (CA) | 200 ppm | Hard | 11 |
| Illinois (IL) | 200 ppm | Hard | 10 |
| Montana (MT) | 180 ppm | Moderately Hard | 8 |
| Colorado (CO) | 170 ppm | Moderately Hard | 9 |
| Idaho (ID) | 170 ppm | Moderately Hard | 8 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in Wyoming, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.