Rock Springs Water Hardness & Quality Report (2026)
Water Hardness
6 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
195.8 mg/L
Est. Daily Cost
$0.27
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 Rock Springs, your appliances are currently losing 14% efficiency due to mineral buildup.
| Appliance | In Rock Springs | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.2 yrs | 8.5 yrs | -27% |
| Washing Machine | 9.8 yrs | 12 yrs | -18% |
| Water Heater | 11.5 yrs | 15 yrs | -23% |
Regional Water Comparison
How Rock Springs compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rock Springs, Wyoming | 102.5 mg/L | 1.7 ppt | 🟡 Moderately Hard | reservoir |
| Green River, Wyoming | 101.5 mg/L | 1.7 ppt | 🟡 Moderately Hard | reservoir |
| Fruita, Colorado | 135 mg/L | 4.8 ppt | 🟠 Hard | reservoir |
| Conda, Idaho | 74.5 mg/L | 1.7 ppt | 🟡 Moderately Hard | reservoir |
| Grand Junction, Colorado | 66.5 mg/L | 2.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Rock Springs compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rock Springs | 102.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rock Springs's Water Unique?
Local geology and source profile
Rock Springs, Wyoming, in Sweetwater County in the high desert of southwest Wyoming — a historically significant coal and trona (sodium carbonate) mining community and natural gas production hub on Interstate 80 — receives its municipal water from the City of Rock Springs Water Division, drawing from local reservoirs fed by the Green River watershed in Sweetwater County. Rock Springs utilizes water impounded from the upper Green River drainage, with storage facilities in the high desert landscape of the Wyoming Basin.
The moderately soft 102.5 mg/L hardness and TDS of 195.8 mg/L reflect the Green River watershed's mixed geological character. The Green River originates in the Wind River Range of central Wyoming — an ancient Precambrian crystalline core of granites, gneisses, and Archean metasedimentary rocks — producing naturally soft water from these crystalline uplands. As the river descends through the Wyoming Basin, it contacts Tertiary volcanic ash beds, Eocene Green River Formation lake sediments (famous for fossil fish), and modest Permian and Triassic carbonate influences, adding some mineral content. The net result is a moderately soft supply that remains one of Wyoming's cleaner water profiles.
At 102.5 mg/L, Rock Springs has moderately soft water — comfortable for everyday household use in this high desert industrial community. Scale forms gradually in kettles and appliances over several months, and routine descaling keeps appliances running efficiently. Quarterly descaling of heating appliances is adequate. The outstanding feature of Rock Springs' water is the exceptionally low PFAS level of 1.7 ppt — among the lowest in the entire USA dataset — reflecting the community's remote high desert location, far from major industrial PFAS sources, making it one of the cleanest PFAS profiles in the western United States.
Geology & Source: Rock Springs in Sweetwater County draws from local Green River watershed reservoirs — the Green River headwaters drain the Wind River Range through Precambrian granite and Tertiary volcanic terrain, with some Permian Phosphoria Formation limestone contact through the basin — mixed granite and carbonate watershed produces moderately soft water at 102.5 mg/L with exceptionally low PFAS.