PlainRecordsWyoming: drinking water systems
The 327 active community water systems in Wyoming on EPA's record, serving 545,237 people (EPA's counts). Systems serving more than 500 people have their own page; find yours by name, city, county, ZIP code or PWS ID. EPA's file dated Oct. 23, 2026.
71 of 327 systems have a health-based violation on EPA's record since Oct. 23, 2023, serving 62,302 of the state's 545,237 people (11%); 7 are an EPA enforcement priority. EPA lists 20 as currently in violation (EPA's system file of Oct. 23, 2026).
Health-based violations, in EPA's words: “Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.”Find your water system
Health-based violations since Oct. 23, 2023, by contaminant or rule
Cities and counties EPA lists, A to Z
The cities EPA lists as served by each system, with the number of systems that list each; a system for which EPA lists no city is under its county.
Counties
A page for each county EPA lists for three or more systems with a page of their own: the systems that serve it and how each stands on EPA's record.
Systems with no city or county on EPA's record, A to Z (4)
- ARAPAHOE COMM WATER SYSTEM4,100 peoplePWS ID 085690004
- ARAPAHOE INDUSTRIAL PARK650 peoplePWS ID 085690008
- ETHETE WATER SYSTEM1,950 peoplePWS ID 085690002Health-based violation since Oct. 23, 2023
- FORT WASHAKIE2,620 peoplePWS ID 085690003
Water systems with a page of their own, A to Z (97)
- AFTON, BOARD OF PUB UTILITIES
- ALPINE, TOWN OF
- ANTELOPE VALLEY I&S DISTRICT (AVISD)
- ARAPAHOE COMM WATER SYSTEM
- ARAPAHOE INDUSTRIAL PARK
- ASPENS PINES W&S DISTRICT
- BAR NUNN, TOWN OF
- BASIN, TOWN OF
- BEAR RIVER REGIONAL JOINT POWERS
- BEDFORD WATER & SEWER DISTRICT
- BIG COUNTRY ESTATES
- BRIDGER VALLEY JOINT POWERS BOARD
- BUFFALO, CITY OF
- BURNS BOARD OF PUBLIC UTILITIES
- BYRON, TOWN OF
- CASPER, CITY OF
- CHEYENNE BOARD OF PUBLIC UTILITIES
- CLEARVIEW I&S DISTRICT
- CODY, CITY OF
- COKEVILLE, TOWN OF
- COWLEY, TOWN OF
- DAYTON, TOWN OF
- DOUGLAS, CITY OF
- DUBOIS, TOWN OF
- EASTVIEW MANUFACTURED HOME COMMUNITY
- ETHETE WATER SYSTEM
- EVANSTON, CITY OF
- EVANSVILLE, TOWN OF
- FARSON EDEN SCHOOL
- FOOTHILLS MOBILE HOME PARK
- FORT WASHAKIE
- FOX PARK SUBDIVISION
- GILLETTE, CITY OF
- GLENROCK, TOWN OF
- GREATER SMOOT W&S DISTRICT
- GREEN RIVER, CITY OF
- GREYBULL, TOWN OF
- GTNP-COLTER BAY VILLAGE
- GTNP-JACKSON LAKE LODGE
- GUERNSEY, TOWN OF
- HANNA, TOWN OF
- HERITAGE VILLAGE SUBDIVISION
- HIGH MEADOW RANCH
- JACKSON, TOWN OF
- JAMESTOWN-RIO VISTA W&S DISTRICT
- KEMMERER-DIAMONDVILLE JPB
- LANDER, CITY OF
- LARAMIE, CITY OF
- LEISURE VALLEY INC/ STAR VALLEY RV PARK
- LITTLE AMERICA HOTELS & RESORTS, INC- WY
- LOVELL, TOWN OF
- LUSK, TOWN OF
- LYMAN, TOWN OF
- MARBLETON, TOWN OF
- MELODY RANCH IMPROVEMENT & SERVICE DIST.
- MILLS, CITY OF
- MOORCROFT, TOWN OF
- MOUNTAIN VIEW, TOWN OF
- NEWCASTLE, CITY OF
- NORTHWEST RURAL WATER DISTRICT
- PINE BLUFFS, TOWN OF
- PINEDALE MUNICIPAL WS
- PIONEER MOBILE HOME PARK
- PIONEER WATER & SEWER DISTRICT
- POWELL, CITY OF
- RAFTER J SUBDIVISION HOA
- RANCHESTER, TOWN OF
- RAWLINS WATER SUPPLY, CITY OF
- RIVERTON, CITY OF
- ROCK SPRINGS, CITY OF
- SALT CREEK WATER DISTRICT
- SARATOGA, TOWN OF
- SHERIDAN, CITY OF
- SHOSHONI, TOWN OF
- SKYLINE VILLAGE MOBILE HOME PK
- SLEEPY HOLLOW SUBDIVISION
- SOUTH BIG HORN COUNTY JPB
- SOUTH CHEYENNE WATER & SEWER DISTRICT
- STAR VALLEY RANCH, TOWN OF
- SUNDANCE, CITY OF
- TETON VILLAGE WATER & SEWER DISTRICT
- THERMOPOLIS, TOWN OF
- TORRINGTON MUNICIPAL WATER DEPT, CITY OF
- UPTON, TOWN OF
- USAF F.E. WARREN AFB
- VETERANS ADMINISTRATION MEDICAL CENTER
- VISTA WEST WATER COMPANY
- WASHAKIE RURAL WATER SYSTEM
- WEST WINDS
- WHEATLAND, TOWN OF
- WHITE MOUNTAIN W&S DISTRICT
- WINCHESTER HILLS
- WORLAND UTILITIES COMMISSION
- WRIGHT WATER & SEWER DISTRICT
- YNP - LAKE VILLAGE
- YNP-MAMMOTH HOT SPRINGS
- YNP-OLD FAITHFUL
From EPA's Safe Drinking Water Information System (SDWIS), through EPA ECHO's drinking water system download. Health-based violations from EPA Envirofacts, downloaded Nov. 2, 2026. EPA's file dated Oct. 23, 2026. EPA: “All compliance and enforcement data displayed on ECHO are current as of the last official quarterly refresh of the source data system, SDWIS, which may lag by three to six months.” These are records of violations, not a test of your tap water today: your water system's annual Consumer Confidence Report has its test results. Names and values are shown as EPA writes them. EPA ECHO drinking water search.