Wyoming Water Systems

Compiled by PlainEnviro Editorial, Environmental Data Editorial Team · July 13, 2026

316 community water systems in Wyoming, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems

316

Total Violations

713

Health Violations

123 systems

Population Served

541,295

Wyoming operates 316 community water systems regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. Together these utilities serve an estimated 541,295 residents, each filing compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency.

Across the state, SDWIS records contain 713 total violations, of which 123 systems carry at least one active health-based violation, a Maximum Contaminant Level (MCL) exceedance or treatment-technique failure. That represents roughly 39% of Wyoming systems.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (123)

#	System Name	City	Source	Violations	Pop. Served	Health
1	DIXON, TOWN OF Dixon	Dixon	Surface Water	93	114	Yes
2	LANCE CREEK WATER DISTRICT Lance Creek	Lance Creek	Groundwater	64	45	Yes
3	BAGGS, TOWN OF Baggs	Baggs	Surface Water	48	400	Yes
4	STONE CREEK HOA Torrington	Torrington	Groundwater	30	100	Yes
5	COTTONWOOD ACRES Torrington	Torrington	Groundwater	28	95	Yes
6	KEMMERER-DIAMONDVILLE JPB Kemmerer	Kemmerer	Surface Water	27	3,348	Yes
7	LITTLE AMERICA HOTELS & RESORTS, INC- WY Little America	Little America	Surface Water	26	2,004	Yes
8	YNP-OLD FAITHFUL Yellowstone	Yellowstone	Surface Water	25	7,675	Yes
9	BUFFALO, CITY OF Buffalo	Buffalo	Surface Water	20	4,419	Yes
10	COKEVILLE, TOWN OF Cokeville	Cokeville	Groundwater	17	535	Yes
11	BENNOR ESTATES & IMPROVEMENT DISTRICT Gillette	Gillette	Groundwater	13	144	Yes
12	KEY LARGO UTILITIES Sheridan	Sheridan	Groundwater	11	105	Yes
13	ETHETE WATER SYSTEM Fort Washakie	Fort Washakie	Surface Water	10	1,950	Yes
14	RIVERMEADOWS WATER DISTRICT Jackson	Jackson	Groundwater	10	100	Yes
15	RED WATER DISTRIBUTION LLC Aladdin	Aladdin	Groundwater	9	35	Yes
16	BROKEN WRENCH LLC Casper	Casper	Groundwater	9	30	Yes
17	RAWLINS WATER SUPPLY, CITY OF Rawlins	Rawlins	Surface Water	8	9,006	Yes
18	MILLS, CITY OF Mills	Mills	Surface Water	8	4,050	Yes
19	POTLATCH TRAILER COURT Torrington	Torrington	Groundwater	8	70	Yes
20	RIMROCK WATER COMPANY LLC Aladdin	Aladdin	Groundwater	7	365	Yes
21	BURLINGTON, TOWN OF Burlington	Burlington	Groundwater	7	348	Yes
22	MANVILLE, TOWN OF Manville	Manville	Groundwater	7	97	Yes
23	LEISURE VALLEY INC/ STAR VALLEY RV PARK Grover	Grover	Groundwater	6	1,910	Yes
24	PAVILLION, TOWN OF Pavillion	Pavillion	Groundwater	6	230	Yes
25	GRANGER, TOWN OF Granger	Granger	Surface Water	6	139	Yes
26	OWL CREEK WATER DISTRICT Thermopolis	Thermopolis	Surface Water	6	100	Yes
27	ROZET RANCHETTES I&S DISTRICT Gillette	Gillette	Groundwater	6	85	Yes
28	OSMOND I&S DISTRICT Afton	Afton	Surface Water	6	31	Yes
29	WHEATLAND, TOWN OF Wheatland	Wheatland	Groundwater	5	3,659	Yes
30	STAR VALLEY RANCH, TOWN OF Star Valley Ranch	Star Valley Ranch	Groundwater	5	2,030	Yes
31	SARATOGA, TOWN OF Saratoga	Saratoga	Groundwater	5	1,720	Yes
32	LA BARGE, TOWN OF La Barge	La Barge	Surface Water	5	347	Yes
33	HOY MOBILE HOME PARK Gillette	Gillette	Groundwater	5	100	Yes
34	LANDER, CITY OF Lander	Lander	Surface Water	4	7,615	Yes
35	ALPINE, TOWN OF Alpine	Alpine	Groundwater	4	1,300	Yes
36	BEAR RIVER REGIONAL JOINT POWERS Bear River	Bear River	Surface Water	4	1,200	Yes
37	VETERANS ADMINISTRATION MEDICAL CENTER Sheridan	Sheridan	Surface Water	4	685	Yes
38	WRANGLER ESTATES Gillette	Gillette	Groundwater	4	250	Yes
39	MEDICINE BOW, TOWN OF Medicine Bow	Medicine Bow	Groundwater	4	189	Yes
40	KENNINGTON SPRINGS PIPELINE Fairview	Fairview	Groundwater	4	45	Yes
41	JEFFREY CITY WATER & SEWER DISTRICT Jeffrey City	Jeffrey City	Groundwater	4	40	Yes
42	RIVERTON, CITY OF Riverton	Riverton	Surface Water	3	10,330	Yes
43	BRIDGER VALLEY JOINT POWERS BOARD Mountain View	Mountain View	Surface Water	3	1,728	Yes
44	LUSK, TOWN OF Lusk	Lusk	Groundwater	3	1,576	Yes
45	MARBLETON, TOWN OF Marbleton	Marbleton	Groundwater	3	861	Yes
46	BEDFORD WATER & SEWER DISTRICT Bedford	Bedford	Groundwater	3	750	Yes
47	WAMSUTTER, TOWN OF Wamsutter	Wamsutter	Groundwater	3	500	Yes
48	LINDLEY PARK, LLC Evanston	Evanston	Groundwater	3	362	Yes
49	GARDENS NORTH HOMEOWNERS ASSOCIATION Pavillion	Pavillion	Groundwater	3	300	Yes
50	GROVER WATER & SEWER DISTRICT Grover	Grover	Groundwater	3	252	Yes
51	SUNRIDGE ESTATES Riverton	Riverton	Groundwater	3	220	Yes
52	ALBIN, TOWN OF Albin	Albin	Groundwater	3	181	Yes
53	SOUTHFORK ESTATES Gillette	Gillette	Groundwater	3	144	Yes
54	HIDE-A-WAY MOBILE VILLAGE Cheyenne	Cheyenne	Groundwater	3	107	Yes
55	WARD CREEK LANDOWNERS ASSOCIATION Gillette	Gillette	Groundwater	3	77	Yes
56	ROCK SPRINGS/GREEN RIVER JPB Green River	Green River	Surface Water	3	25	Yes
57	GLENROCK, TOWN OF Glenrock	Glenrock	Groundwater	2	2,466	Yes
58	MOORCROFT, TOWN OF Moorcroft	Moorcroft	Groundwater	2	1,009	Yes
59	COWLEY, TOWN OF Cowley	Cowley	Groundwater	2	800	Yes
60	ARAPAHOE INDUSTRIAL PARK Fort Washakie	Fort Washakie	Groundwater	2	650	Yes
61	HUDSON, TOWN OF Hudson	Hudson	Surface Water	2	460	Yes
62	NATRONA COUNTY INT'L AIRPORT Casper	Casper	Surface Water	2	375	Yes
63	COUNTRYSIDE WATER USERS, INC. Gillette	Gillette	Groundwater	2	360	Yes
64	SUPERIOR, TOWN OF Superior	Superior	Groundwater	2	336	Yes
65	ORCHARD VALLEY WATER COMPANY Cheyenne	Cheyenne	Groundwater	2	260	Yes
66	FAIRVIEW WATER & SEWER DISTRICT Grover	Grover	Groundwater	2	230	Yes
67	CHUGWATER, TOWN OF Chugwater	Chugwater	Groundwater	2	200	Yes
68	ELK MOUNTAIN, TOWN OF Elk Mountain	Elk Mountain	Groundwater	2	191	Yes
69	MOUNTAIN VIEW ACRES Pavillion	Pavillion	Groundwater	2	165	Yes
70	FIRST FIKE SUBDIVISION Pavillion	Pavillion	Groundwater	2	150	Yes
71	INDIAN PAINTBRUSH WATER DISTRICT Wilson	Wilson	Groundwater	2	150	Yes
72	CENTENNIAL WATER AND SEWER DISTRICT Centennial	Centennial	Groundwater	2	150	Yes
73	COUNTRYSIDE COURT Mills	Mills	Groundwater	2	125	Yes
74	RED LANE DOMESTIC WATER, INC. Thermopolis	Thermopolis	Surface Water	2	110	Yes
75	TURNERVILLE WATER AND SEWER DISTRICT Grover	Grover	Surface Water	2	90	Yes
76	HI-COUNTRY WATER DISTRICT Wilson	Wilson	Groundwater	2	85	Yes
77	RESTWAY TRAVEL PARK Cheyenne	Cheyenne	Groundwater	2	62	Yes
78	LAKEVIEW MOBILE HOME PARK Gillette	Gillette	Groundwater	2	36	Yes
79	EVERGREEN MOBILE HOME PARK Cheyenne	Cheyenne	Groundwater	2	26	Yes
80	SHERIDAN, CITY OF Sheridan	Sheridan	Surface Water	1	22,700	Yes
81	NEWCASTLE, CITY OF Newcastle	Newcastle	Groundwater	1	3,595	Yes
82	ARAPAHOE COMM WATER SYSTEM Ethete	Ethete	Groundwater	1	3,100	Yes
83	PINEDALE MUNICIPAL WS Pinedale	Pinedale	Surface Water	1	1,900	Yes
84	DUBOIS, TOWN OF Dubois	Dubois	Groundwater	1	1,870	Yes
85	RAFTER J SUBDIVISION HOA Wilson	Wilson	Groundwater	1	1,500	Yes
86	SUNDANCE, CITY OF Sundance	Sundance	Groundwater	1	1,279	Yes
87	MOUNTAIN VIEW, TOWN OF Mountain View	Mountain View	Surface Water	1	1,250	Yes
88	UPTON, TOWN OF Upton	Upton	Groundwater	1	1,100	Yes
89	HERITAGE VILLAGE SUBDIVISION Gillette	Gillette	Groundwater	1	750	Yes
90	FARSON EDEN SCHOOL Rock Springs	Rock Springs	Groundwater	1	530	Yes
91	ENCAMPMENT, TOWN OF Encampment	Encampment	Surface Water	1	450	Yes
92	BIG PINEY, TOWN OF Big Piney	Big Piney	Groundwater	1	445	Yes
93	JUBYS MOBILE HOME PARK Cody	Cody	Surface Water	1	300	Yes
94	BAR Y ESTATES/GROS VENTRE WEST WTR DISTS Wilson	Wilson	Groundwater	1	270	Yes
95	OSMOND PIPELINE CO Afton	Afton	Groundwater	1	250	Yes
96	OSAGE WATER DISTRICT Osage	Osage	Groundwater	1	240	Yes
97	WEST END WATER DISTRICT Newcastle	Newcastle	Groundwater	1	225	Yes
98	GTNP--MOOSE/BEAVER CREEK Moose	Moose	Groundwater	1	221	Yes
99	POISON SPIDER I&S DISTRICT Casper	Casper	Surface Water	1	200	Yes
100	B&K MOBILE HOME PARK Pavillion	Pavillion	Groundwater	1	200	Yes
101	JADE MHC Riverton	Riverton	Groundwater	1	200	Yes
102	MEDICINE WATERS VILLAGE Rawlins	Rawlins	Groundwater	1	200	Yes
103	STONE GATE ESTATES Gillette	Gillette	Groundwater	1	198	Yes
104	SQUAW CREEK WATER DISTRICT Wilson	Wilson	Groundwater	1	160	Yes
105	WATER UNLIMITED, INCORPORATED Newcastle	Newcastle	Groundwater	1	144	Yes
106	ETNA WATER & SEWER DISTRICT Grover	Grover	Groundwater	1	135	Yes
107	YODER, TOWN OF Yoder	Yoder	Groundwater	1	131	Yes
108	SEVEN MILE WATER & SEWER DISTRICT Laramie	Laramie	Surface Water	1	130	Yes
109	MANDERSON, TOWN OF Basin	Basin	Groundwater	1	110	Yes
110	A & J MOBILE HOME PARK Pavillion	Pavillion	Groundwater	1	100	Yes
111	TETON SHADOWS HOA Wilson	Wilson	Groundwater	1	100	Yes
112	PLAY PARK LLC Gillette	Gillette	Groundwater	1	96	Yes
113	CARPENTER W&S DISTRICT Cheyenne	Cheyenne	Groundwater	1	94	Yes
114	WESTVIEW VILLAGE Grover	Grover	Groundwater	1	83	Yes
115	POINT OF ROCKS MERCANTILE Point Of Rocks	Point Of Rocks	Groundwater	1	78	Yes
116	BAIROIL, TOWN OF Bairoil	Bairoil	Groundwater	1	71	Yes
117	FARVIEW WATER AND SEWER DISTRICT Pavillion	Pavillion	Groundwater	1	60	Yes
118	MILE-HI I&S DISTRICT Casper	Casper	Surface Water	1	48	Yes
119	BIG VALLEY & CROSSED ARROWS IMP DIST Meeteetse	Meeteetse	Groundwater	1	35	Yes
120	SECOND FIKE SUBDIVISION Pavillion	Pavillion	Groundwater	1	34	Yes
121	MILLER LOWER MOBILE HOME PARK Cheyenne	Cheyenne	Groundwater	1	30	Yes
122	CEDAR SPRINGS MEADOWS Thayne	Thayne	Groundwater	1	19	Yes
123	NORTH FORTY SUBDIVISION Thayne	Thayne	Groundwater	1	15	Yes

Systems with No Violations (193)

193 water systems in Wyoming have zero recorded violations. Showing the 50 largest by population served.

CHEYENNE BOARD OF PUBLIC UTILITIES (64,165) CASPER, CITY OF (59,000) LARAMIE, CITY OF (32,395) GILLETTE, CITY OF (32,222) JACKSON, TOWN OF (24,760) ROCK SPRINGS, CITY OF (24,000) EVANSTON, CITY OF (12,000) GREEN RIVER, CITY OF (10,500) CODY, CITY OF (10,224) SOUTH CHEYENNE WATER & SEWER DISTRICT (10,000) NORTHWEST RURAL WATER DISTRICT (7,330) TORRINGTON MUNICIPAL WATER DEPT, CITY OF (6,847) DOUGLAS, CITY OF (6,400) POWELL, CITY OF (6,310) YNP - LAKE VILLAGE (5,925) USAF F.E. WARREN AFB (5,500) WORLAND UTILITIES COMMISSION (5,487) GTNP-COLTER BAY VILLAGE (4,514) BAR NUNN, TOWN OF (4,000) FORT WASHAKIE (3,520) GREYBULL, TOWN OF (3,260) WHITE MOUNTAIN W&S DISTRICT (3,000) THERMOPOLIS, TOWN OF (2,775) EVANSVILLE, TOWN OF (2,728) YNP-MAMMOTH HOT SPRINGS (2,600) WRIGHT WATER & SEWER DISTRICT (2,500) SLEEPY HOLLOW SUBDIVISION (2,400) LOVELL, TOWN OF (2,360) LYMAN, TOWN OF (2,203) AFTON, BOARD OF PUB UTILITIES (2,000) GTNP-JACKSON LAKE LODGE (1,830) VISTA WEST WATER COMPANY (1,600) PIONEER WATER & SEWER DISTRICT (1,500) ASPENS PINES W&S DISTRICT (1,400) RANCHESTER, TOWN OF (1,297) ANTELOPE VALLEY I&S DISTRICT (AVISD) (1,280) BASIN, TOWN OF (1,250) GUERNSEY, TOWN OF (1,157) WINCHESTER HILLS (1,078) BURNS BOARD OF PUBLIC UTILITIES (1,024) PIONEER MOBILE HOME PARK (1,000) WASHAKIE RURAL WATER SYSTEM (990) CLEARVIEW I&S DISTRICT (930) TETON VILLAGE WATER & SEWER DISTRICT (906) MELODY RANCH IMPROVEMENT & SERVICE DIST. (900) SOUTH BIG HORN COUNTY JPB (900) FOX PARK SUBDIVISION (843) HANNA, TOWN OF (841) DAYTON, TOWN OF (824) FOOTHILLS MOBILE HOME PARK (735) +143 more

All Water Systems in Wyoming (316)

Page 1 of 7, ordered by population served.

System	Population Served	Violations
CHEYENNE BOARD OF PUBLIC UTILITIES	64,165	0
CASPER, CITY OF	59,000	0
LARAMIE, CITY OF	32,395	0
GILLETTE, CITY OF	32,222	0
JACKSON, TOWN OF	24,760	0
ROCK SPRINGS, CITY OF	24,000	0
SHERIDAN, CITY OF	22,700	1
EVANSTON, CITY OF	12,000	0
GREEN RIVER, CITY OF	10,500	0
RIVERTON, CITY OF	10,330	3
CODY, CITY OF	10,224	0
SOUTH CHEYENNE WATER & SEWER DISTRICT	10,000	0
RAWLINS WATER SUPPLY, CITY OF	9,006	8
YNP-OLD FAITHFUL	7,675	25
LANDER, CITY OF	7,615	4
NORTHWEST RURAL WATER DISTRICT	7,330	0
TORRINGTON MUNICIPAL WATER DEPT, CITY OF	6,847	0
DOUGLAS, CITY OF	6,400	0
POWELL, CITY OF	6,310	0
YNP - LAKE VILLAGE	5,925	0
USAF F.E. WARREN AFB	5,500	0
WORLAND UTILITIES COMMISSION	5,487	0
GTNP-COLTER BAY VILLAGE	4,514	0
BUFFALO, CITY OF	4,419	20
MILLS, CITY OF	4,050	8
BAR NUNN, TOWN OF	4,000	0
WHEATLAND, TOWN OF	3,659	5
NEWCASTLE, CITY OF	3,595	1
FORT WASHAKIE	3,520	0
KEMMERER-DIAMONDVILLE JPB	3,348	27
GREYBULL, TOWN OF	3,260	0
ARAPAHOE COMM WATER SYSTEM	3,100	1
WHITE MOUNTAIN W&S DISTRICT	3,000	0
THERMOPOLIS, TOWN OF	2,775	0
EVANSVILLE, TOWN OF	2,728	0
YNP-MAMMOTH HOT SPRINGS	2,600	0
WRIGHT WATER & SEWER DISTRICT	2,500	0
GLENROCK, TOWN OF	2,466	2
SLEEPY HOLLOW SUBDIVISION	2,400	0
LOVELL, TOWN OF	2,360	0
LYMAN, TOWN OF	2,203	0
STAR VALLEY RANCH, TOWN OF	2,030	5
LITTLE AMERICA HOTELS & RESORTS, INC- WY	2,004	26
AFTON, BOARD OF PUB UTILITIES	2,000	0
ETHETE WATER SYSTEM	1,950	10
LEISURE VALLEY INC/ STAR VALLEY RV PARK	1,910	6
PINEDALE MUNICIPAL WS	1,900	1
DUBOIS, TOWN OF	1,870	1
GTNP-JACKSON LAKE LODGE	1,830	0
BRIDGER VALLEY JOINT POWERS BOARD	1,728	3

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Frequently Asked Questions

How many water systems are in Wyoming?

Wyoming has 316 community water systems tracked by the EPA, serving a combined population of 541,295 people.

How many water systems in Wyoming have health violations?

123 water systems in Wyoming have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 39% of all systems in the state.

What is the total number of water violations in Wyoming?

Wyoming water systems have accumulated 713 total violations across all 316 community water systems.

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About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

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