Is Wyoming Tap Water Safe to Drink?

Water quality data for 7 cities across Wyoming. Find your city below.

Water quality in Wyoming varies significantly from city to city. Across 7 cities we track, hardness ranges from 66 PPM in Laramie to 245 PPM in Gillette, with a statewide average of 168 PPM. 5 of 7 cities have hard water above 120 PPM where a water softener provides measurable benefits.

1 Wyoming cities have forever chemicals (PFAS) above the EPA's 2024 limit of 4 parts per trillion: Riverton (125.6 ppt). A reverse osmosis system or NSF P473-certified filter can reduce PFAS to safe levels.

7
Cities
168
Avg Hardness (PPM)
245
Hardest City (PPM)

Complete Wyoming Guide

Statewide water quality overview, costs, and treatment recommendations.

Well Water in Wyoming

Testing, treatment, and common issues for private wells.

Hardest Water Rankings

Wyoming cities ranked by water hardness level.

City Comparisons

Gillette vs Laramie

Side-by-side water quality comparison.

Gillette vs Rock Springs

Side-by-side water quality comparison.

Rock Springs vs Casper

Side-by-side water quality comparison.

Wyoming Cities by Water Hardness

CityHardness (PPM)LevelPFAS (ppt)Source
Gillette 245 Very Hard 0 Local wells in Powder River Basin
Rock Springs 200 Very Hard 0 Green River
Casper 196 Very Hard 0 North Platte River, Alcova Reservoir
Cheyenne 190 Very Hard 0 Granite Springs + Crystal Reservoir
Riverton 180 Very Hard 125.6 Wind River & wells
Sheridan 100 Moderately Hard 0 Big Goose Creek
Laramie 66 Moderately Hard 0 Albany County groundwater

Frequently Asked Questions About Wyoming Water

Is Wyoming tap water safe to drink?
Wyoming tap water meets EPA legal standards in most cities. 1 cities have PFAS levels above the EPA health advisory of 4 ppt. The statewide average hardness of 168 PPM means most homes deal with hard water effects like scale buildup, though hardness is not a health concern. Check your specific city above for detailed data.
Do I need a water softener in Wyoming?
Most Wyoming cities would benefit from a water softener. The state average is 168 PPM, and 71% of cities exceed 120 PPM where softener benefits become measurable. A salt-based softener reduces scale damage, energy waste, and product use.
Which Wyoming city has the hardest water?
Gillette has the hardest water in Wyoming at 245 PPM (14.3 GPG). Rock Springs is second at 200 PPM. See the full ranking.
What contaminants are in Wyoming water?
The most common concerns across Wyoming are hard water minerals (calcium and magnesium), and PFAS (forever chemicals) detected in 1 cities. Each city has different levels - check your city above for specific contaminant data.
How much does a water softener cost in Wyoming?
A whole-house water softener for a typical Wyoming home costs $800-$2,500 installed, depending on capacity and brand. At 168 PPM average hardness, most homes need a 32,000-48,000 grain system. Full cost breakdown.

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Guides

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Common Issues

Hard Water PFAS Lead Chlorine