Tapcensus

Wyoming drinking water quality

Wyoming has 773 active public water systems serving 651K people. 421 of them, 54%, had at least one EPA violation in the past three years, 131 have an unresolved violation today, and 10 are designated serious violators by the EPA.

Active systems 773 in 23 counties
People served 651K 327 community systems serve 545K
Violations, past 3 years 421 54% of active systems
Serious violators 10 41 systems carry a health flag

Largest counties

All 23 counties
CountyPeople servedSystemsWith violations
Laramie96,5765125
Natrona81,9914932
Teton80,74011754
Sweetwater54,8444825
Campbell52,9816813
Albany38,6532514
Park38,2495029
Sheridan28,0202113
Fremont26,3806138
Uinta20,513139

Largest community water systems

All 773 systems
SystemServesStatus
Cheyenne Board of Public Utilities
Laramie County		 64,165
Casper, City of
Natrona County		 59,000
Laramie, City of
Albany County		 32,395
Gillette, City of
Campbell County		 32,222
Jackson, Town of
Teton County		 24,760
Rock Springs, City of
Sweetwater County		 24,000
Sheridan, City of
Sheridan County		 22,700
Evanston, City of
Uinta County		 11,727
Green River, City of
Sweetwater County		 10,500
Riverton, City of
Fremont County		 10,330

About the Wyoming data

Retrieved from EPA ECHO on Oct 11, 2026.

Most common violations in Wyoming

Revised Total Coliform Rule (RTCR)180 systemsNitrate-Nitrite (Combined)107 systemsConsumer Confidence Rule (CCR)52 systemsXylenes, Total35 systemsTTHM (Total Trihalomethanes)34 systems
All contaminants and rules in Wyoming

More for Wyoming