How does Rock Springs's water compare to the national average?

The USA national average is 151 mg/L. Rock Springs (≈ 120–179 mg/L) is 1 mg/L softer than average.

Rock Springs Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

8.2

neutral = 7.0

Lead

0.004 mg/L

✓ Below action level

TDS

2085 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 20% efficiency due to mineral buildup.

Appliance	In Rock Springs	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How Rock Springs compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Rock Springs, Wyoming	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Green River, Wyoming	≈ 180+ mg/L	0 ppt	🔴 Very Hard	reservoir
Vernal, Utah	≈ 180+ mg/L	0 ppt	🔴 Very Hard	reservoir
Riverton, Wyoming	≈ 180+ mg/L	125.6 ppt	🔴 Very Hard	reservoir
Evanston, Wyoming	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir

National Benchmark

How Rock Springs compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Rock Springs	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Rock Springs's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 2085 mg/LpH: 8.2

ROCK SPRINGS, CITY OF provides drinking water to Rock Springs in Sweetwater County, Wyoming, with utility offices at 212 D Street, Rock Springs, WY 82901. Water is sourced from purchased surface water, likely from the Green River basin. Treatment employs biological filtration, standard filtration, and disinfection using chlorine and ozone, though some portions of the supply receive no treatment. The utility can be reached at 307-352-1405 or the 24/7 emergency line at 307-352-1527. The utility reports 3–6 contaminants above EPA health-based MCLGs in served areas and recommends use of filters.

The supply originates in the Green River watershed within the Greater Green River Basin, where surface waters flow over and infiltrate Cretaceous sandstones and shales of the Mesaverde and Lance formations, interacting with older Paleozoic carbonates including the Madison Limestone. This geology, characteristic of the Rocky Mountain region, leaches alkaline earth metals from limestone and dolomite bedrock, resulting in a hard supply. Alluvial deposits along river channels provide minor aquifer storage, but the dominant chemistry reflects long-term dissolution in carbonate terrain rather than soft, granitic highlands.

At this hard level, scale buildup accelerates in water heaters, dishwashers, and washing machines, potentially reducing efficiency and shortening appliance life. Faucet aerators and showerheads clog frequently, increasing cleaning needs. Maintenance tips include monthly vinegar descaling for fixtures and annual heater flushes. Installing a water softener is recommended to prevent spotting on dishes, dry skin from soap scum, and plumbing corrosion over time. Treatment includes biological filtration, filtration, chlorination, and ozonation of surface water sources.

Geology & Source: Green River watershed — Cretaceous Mesaverde Group sandstones and Frontier Formation shales; Paleozoic Madison Limestone and Phosphoria Formation dissolve calcium and magnesium; Overthrust Belt carbonates produce hard supply

Other Wyoming Water Reports

Green River

≈ 180+ mg/L

🔴 Very Hard

Vernal

≈ 180+ mg/L

🔴 Very Hard

Riverton

≈ 180+ mg/L

🔴 Very Hard

Evanston

≈ 120–179 mg/L

🟠 Hard

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All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Rock Springs's water safe to drink?

Yes. Rock Springs's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Rock Springs?

At ≈ 120–179 mg/L (Hard), Rock Springs's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Rock Springs compare to the USA average?

The USA national average is 151 mg/L. Rock Springs (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Rock Springs is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.