Gillette Water Hardness & Quality Report (2026)
Water Hardness
4.3 grains per gallon
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
120.8 mg/L
Est. Daily Cost
$0.19
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Gillette, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Gillette | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Gillette compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Gillette, Wyoming | 73 mg/L | 1.3 ppt | 🟡 Moderately Hard | reservoir |
| Sheridan, Wyoming | 186.5 mg/L | 2.6 ppt | 🔴 Very Hard | reservoir |
| Casper, Wyoming | 62 mg/L | 1.2 ppt | 🟡 Moderately Hard | reservoir |
| Rapid City, South Dakota | 333.5 mg/L | 3.3 ppt | 🔴 Very Hard | groundwater |
| Laramie, Wyoming | 163.5 mg/L | 2.3 ppt | 🟠 Hard | reservoir |
National Benchmark
How Gillette compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Gillette | 73 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Gillette's Water Unique?
Local geology and source profile
Gillette, Wyoming, the Campbell County seat — a major northeast Wyoming coal country city (Gillette is the Campbell County seat and the 'Energy Capital of the Nation' — Campbell County is the most prolific coal-producing county in the United States, with the Powder River Basin coal mines producing more than any other county in the country; the vast surface coal mines around Gillette supply coal to power plants across the United States), a diverse Campbell County community with a significant working-class energy industry (coal mining, oil drilling, natural gas extraction), and a rapidly growing Wyoming boomtown community (Gillette has experienced multiple boom-bust cycles tied to coal and energy prices, growing dramatically during energy booms and contracting during downturns), home of Cam-plex (a significant multipurpose event center and park in Gillette — one of the major event venues in northeast Wyoming) — draws its municipal water supply from the Belle Fourche River (Keyhole Reservoir) via the City of Gillette Water Division. Water hardness in Gillette measures 73 mg/L — classified as moderately soft.
Gillette's moderate softness reflects the northeast Wyoming Powder River Basin watershed's calcareous-poor Cretaceous and Paleocene sedimentary geology. The Belle Fourche River watershed at Gillette–Campbell County drains: the Cretaceous Lance and Fox Hills Formations (calcareous-poor terrestrial sandstone and shale); and the Paleocene Fort Union Formation (calcareous-poor coal-bearing sedimentary). City of Gillette treatment produces the moderate 73 mg/L.
With hardness at 73 mg/L, Gillette residents enjoy moderately soft water. City of Gillette Water Division consistently delivers water meeting all Wyoming DEQ and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from the Keyhole Reservoir (Belle Fourche River watershed) via the City of Gillette Water Division — the Campbell County northeast Wyoming Powder River Basin (Cretaceous calcareous-poor Lance and Fox Hills Formations and Paleocene calcareous-poor Fort Union Formation — the calcareous-poor northeast Wyoming Powder River Basin sedimentary terrain; Belle Fourche supply with treatment); moderately soft supply at 73 mg/L in Campbell County.