Wyoming Drinking Water Compliance Records
323 water systems serving 534,408 people. 1,665 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
285
88%
B
13
4%
C
19
6%
D
5
2%
F
1
0%
323
Water Systems
534,408
Population Served
1,665
Historical Records
69
Health-Based (All Years)
Systems With the Most Recent EPA Records
EVERGREEN MOBILE HOME PARK
35 served81 historical records53 recent
C
NEWCASTLE, CITY OF
3,595 served113 historical records46 recent
C
LUSK, TOWN OF
1,576 served26 historical records21 recent
C
WHEATLAND, TOWN OF
3,659 served30 historical records20 recent
D
NORTH ALPINE I&S DISTRICT
200 served49 historical records19 recent
C
MOUNTAIN VILLAGE PARKS
53 served66 historical records18 recent
C
COKEVILLE, TOWN OF
535 served44 historical records16 recent
D
GREYBULL, TOWN OF
2,080 served68 historical records11 recent
C
WEST END WATER DISTRICT
225 served28 historical records10 recent
C
BURNS BOARD OF PUBLIC UTILITIES
1,024 served39 historical records10 recent
C
Large Systems With No Recent Records
CHEYENNE BOARD OF PUBLIC UTILITIES
64,165 served1 historical record
A
CASPER, CITY OF
59,000 served1 historical record
A
LARAMIE, CITY OF
32,395 served1 historical record
A
GILLETTE, CITY OF
32,222 served1 historical record
A
JACKSON, TOWN OF
24,760 served3 historical records
A
ROCK SPRINGS, CITY OF
24,000 served0 historical records
A
SHERIDAN, CITY OF
22,700 served1 historical record
A
EVANSTON, CITY OF
11,727 served0 historical records
A
GREEN RIVER, CITY OF
10,500 served0 historical records
A
RIVERTON, CITY OF
10,330 served3 historical records
A
Largest Water Systems in Wyoming
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| CHEYENNE BOARD OF PUBLIC UTILITIES | A | 64,165 | 1 |
| CASPER, CITY OF | A | 59,000 | 1 |
| LARAMIE, CITY OF | A | 32,395 | 1 |
| GILLETTE, CITY OF | A | 32,222 | 1 |
| JACKSON, TOWN OF | A | 24,760 | 3 |
| ROCK SPRINGS, CITY OF | A | 24,000 | 0 |
| SHERIDAN, CITY OF | A | 22,700 | 1 |
| EVANSTON, CITY OF | A | 11,727 | 0 |
| GREEN RIVER, CITY OF | A | 10,500 | 0 |
| RIVERTON, CITY OF | A | 10,330 | 3 |
| CODY, CITY OF | A | 10,224 | 3 |
| SOUTH CHEYENNE WATER & SEWER DISTRICT | A | 10,000 | 0 |
| RAWLINS WATER SUPPLY, CITY OF | A | 9,006 | 8 |
| YNP-OLD FAITHFUL | A | 7,675 | 1 |
| LANDER, CITY OF | A | 7,615 | 1 |
| NORTHWEST RURAL WATER DISTRICT | A | 7,330 | 1 |
| TORRINGTON MUNICIPAL WATER DEPT, CITY OF | A | 6,847 | 3 |
| DOUGLAS, CITY OF | A | 6,400 | 2 |
| POWELL, CITY OF | A | 6,310 | 1 |
| YNP - LAKE VILLAGE | A | 5,925 | 0 |
Contaminants in Wyoming
Lead in WyomingArsenic in WyomingNitrate in WyomingFluoride in WyomingPFOS in WyomingPFOA in WyomingTHMs in WyomingHAA5 in Wyoming
Cities in Wyoming
CHEYENNE(16)CASPER(17)GILLETTE(48)LARAMIE(9)ROCK SPRINGS(15)JACKSON(25)SHERIDAN(3)CODY(7)YELLOWSTONE(3)EVANSTON(3)GREEN RIVER(6)RIVERTON(12)MILLS(9)YELLOWSTONE NP(2)RAWLINS(2)LANDER(4)TORRINGTON(6)DOUGLAS(6)POWELL(3)WORLAND(4)MOOSE(3)YELLOWSTONE NT(1)F.E. WARREN AFB(1)WILSON(20)NEWCASTLE(7)BUFFALO(3)THAYNE(5)THERMOPOLIS(6)BAR NUNN(1)LYMAN(2)WHEATLAND(2)KEMMERER(2)WRIGHT(1)GROVER(9)EVANSVILLE(2)MOUNTAIN VIEW(2)AFTON(6)PINEDALE(2)GLENROCK(1)LOVELL(2)BASIN(3)GREYBULL(3)DUBOIS(3)ALPINE(4)STAR VALLEY RANCH(1)LITTLE AMERICA(1)SARATOGA(2)FARMINGTON HILLS(5)LUSK(1)SUNDANCE(2)RANCHESTER(1)FORT COLLINS(2)LITTLETON(3)BEAR RIVER(1)PINE BLUFFS(1)GUERNSEY(1)UPTON(1)MOORCROFT(2)BURNS(1)PAVILLION(8)COWLEY(3)TETON VILLAGE(1)MARBLETON(1)HANNA(1)BEDFORD(2)DAYTON(1)SMOOT(1)ETNA(2)ENCAMPMENT(2)BYRON(1)FARSON(2)COKEVILLE(1)SHOSHONI(1)WAMSUTTER(1)BIG PINEY(2)PINE HAVEN(1)LINGLE(1)HUDSON(1)ROLLING HILLS(1)LA GRANGE(1)SINCLAIR(1)HULETT(1)BAGGS(1)TEN SLEEP(1)CEDAREDGE(1)MEETEETSE(2)BURLINGTON(1)LA BARGE(1)SUPERIOR(1)MIDWEST(1)FREEDOM(1)GLENDO(1)KAYCEE(1)EAST THERMOPOLIS(1)FORT LARAMIE(1)ROCK RIVER(1)OSAGE(1)CHUGWATER(1)EDGERTON(1)ELK MOUNTAIN(1)