Hardest Water in Wyoming
7 cities ranked by water hardness. Gillette tops the list at 245 PPM.
Wyoming's water hardness varies significantly by city and water source. The state average across our database is 168 PPM, which is hard. Many households will benefit from a softener or conditioner. 71% of cities we track in Wyoming have hardness above 120 PPM.
Gillette has the hardest water at 245 PPM (14.3 GPG). At this level, expect visible scale on faucets, reduced water heater efficiency, and higher soap usage. A salt-based water softener typically pays for itself within 12-18 months in energy and consumable savings.
| # | City | PPM | GPG | Level | Softener? |
|---|---|---|---|---|---|
| 1 | Gillette | 245 | 14.3 | Very Hard | Yes |
| 2 | Rock Springs | 200 | 11.7 | Very Hard | Yes |
| 3 | Casper | 196 | 11.5 | Very Hard | Yes |
| 4 | Cheyenne | 190 | 11.1 | Very Hard | Yes |
| 5 | Riverton | 180 | 10.5 | Very Hard | Yes |
| 6 | Sheridan | 100 | 5.8 | Moderately Hard | Optional |
| 7 | Laramie | 66 | 3.9 | Moderately Hard | Optional |
Frequently Asked Questions
What is the average water hardness in Wyoming?
Across 7 cities in our database, the average water hardness in Wyoming is 168 PPM (9.8 GPG). This ranges from 66 PPM in Laramie to 245 PPM in Gillette.
Do I need a water softener in Wyoming?
It depends on your city. 71% of Wyoming cities in our database (5 of 7) have hardness above 120 PPM where a softener provides measurable benefit. Check your specific city above.
Which Wyoming city has the softest water?
Laramie has the softest water in Wyoming at 66 PPM (3.9 GPG). No water softener is needed at this level.
What causes hard water in Wyoming?
Hard water in Wyoming is caused by dissolved calcium and magnesium from the local geology. Limestone and dolomite bedrock are the primary sources, dissolving minerals into groundwater and surface water as it flows through the rock.