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Wyoming Tap Water Quality 2026

EPA drinking water data for 158 cities across Wyoming — covering lead levels, violation history, and compliance status.

Systems tracked: 143 Cities covered: 158 Updated: 2026 Q2
A

Wyoming earns an A for overall water quality

158 communities across 23 counties and 143 water systems. 96.8% have no open violations.

Median lead where detected: 2.00 ppb
26.6% of systems report lead as not detected — a state filing convention, not a water quality measure
PFAS tested at 20.3% of communities; 1 above the federal limit
Lead reported for 100.0% of communities
96.8% of communities have no open violations
Water Systems
143
Active community systems
Median Lead Level
2 ppb
13% of EPA action level
Fully Compliant
96.8%
of systems — no active violations
How we grade states Grades are based on actual EPA enforcement data — MCL violations and lead levels measured against the 15 ppb federal action level. We do not use MCLG-based detections, which are aspirational zero-tolerance goals that would make nearly every state look dangerous. Read our full methodology →

Best & Worst Cities in Wyoming

✓ Cleanest Water
Riverside
Carbon County
2.7 ppb B
Casper
Natrona County
1.0 ppb A
Laramie
Albany County
1.3 ppb A
Gillette
Campbell County
4.0 ppb A
Rock Springs
Sweetwater County
3.0 ppb A
Sheridan
Sheridan County
0.0 ppb A
⚠ Needs Attention
Lance Creek
Niobrara County
0.0 ppb F
Point of Rocks
Sweetwater County
0.0 ppb D
Albin
Laramie County
0.0 ppb D
Ethete
Fremont County
1.0 ppb C
Star Valley Ranch
Lincoln County
8.0 ppb C
Baggs
Carbon County
9.0 ppb C

Water Quality by County

23 of 23
Sort:
CountySystemsLead LevelViolationsGrade
Lincoln County 22 2.0 ppb 0 B
Sweetwater County 14 3.0 ppb 0 A
Natrona County 13 1.0 ppb 0 A
Fremont County 11 4.0 ppb 0 B
Carbon County 11 2.7 ppb 0 A
Big Horn County 11 3.0 ppb 0 A
Laramie County 9 6.0 ppb 0 B
Teton County 8 2.5 ppb 0 A
Uinta County 6 1.0 ppb 0 A
Sheridan County 6 3.3 ppb 0 A

About Wyoming Drinking Water

Wyoming is served by 143 community water systems covering 158 communities across 23 counties. 96.8% have no open violation on record.

Lead was detected in 116 communities, with a median of 2.00 ppb — 13% of the federal action level. A further 42 reported none detected. That share is a state reporting convention rather than a measure of water quality, so it is stated separately rather than averaged in.

PFAS has been tested at 20.3% of communities here, and 1 are above the limits EPA set in 2024. Coverage matters: states that test more find more, so this figure is not comparable with a state that has tested less.

Frequently Asked Questions

Is Wyoming tap water safe to drink? ▼
96.8% of communities have no open violation on record. 1 have PFAS above the federal limit set in 2024, which is the main open concern.
Does Wyoming have a lead problem? ▼
2 water systems report a 90th-percentile lead result at or above the 15 ppb action level. The action level is a treatment trigger, not a legal maximum, and 42 communities report no detection at all.
How complete is the data for Wyoming? ▼
Lead results are reported for 100.0% of communities and PFAS for 20.3%. Where a figure is missing it is shown as not reported rather than assumed safe.
How does Wyoming compare with other states? ▼
We do not rank states against each other. Lead reporting completeness ranges from under 20% to 100% depending on the state, so a national ranking would compare filing practice rather than water quality.