Wyoming Water Systems

Compiled by PlainEnviro · August 25, 2026

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

Water Systems

317

Health-Based Violation Records

730

Health Violations

123 systems

Population Served

539,928

Wyoming community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

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	50	400	Yes
4	KEMMERER-DIAMONDVILLE JPB Kemmerer	Kemmerer	Surface Water	35	3,348	Yes
5	STONE CREEK HOA Torrington	Torrington	Groundwater	30	100	Yes
6	COTTONWOOD ACRES Torrington	Torrington	Groundwater	30	95	Yes
7	YNP-OLD FAITHFUL Yellowstone	Yellowstone	Surface Water	26	7,675	Yes
8	LITTLE AMERICA HOTELS & RESORTS, INC- WY Little America	Little America	Surface Water	26	2,004	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	MILLS, CITY OF Mills	Mills	Surface Water	9	4,050	Yes
16	RED WATER DISTRIBUTION LLC Aladdin	Aladdin	Groundwater	9	35	Yes
17	BROKEN WRENCH LLC Casper	Casper	Groundwater	9	30	Yes
18	RAWLINS WATER SUPPLY, CITY OF Rawlins	Rawlins	Surface Water	8	9,006	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	WHEATLAND, TOWN OF Wheatland	Wheatland	Groundwater	5	3,659	Yes
29	STAR VALLEY RANCH, TOWN OF Star Valley Ranch	Star Valley Ranch	Groundwater	5	2,030	Yes
30	SARATOGA, TOWN OF Saratoga	Saratoga	Groundwater	5	1,720	Yes
31	VETERANS ADMINISTRATION MEDICAL CENTER Sheridan	Sheridan	Surface Water	5	685	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	WRANGLER ESTATES Gillette	Gillette	Groundwater	4	250	Yes
38	MEDICINE BOW, TOWN OF Medicine Bow	Medicine Bow	Groundwater	4	189	Yes
39	KENNINGTON SPRINGS PIPELINE Fairview	Fairview	Groundwater	4	45	Yes
40	JEFFREY CITY WATER & SEWER DISTRICT Jeffrey City	Jeffrey City	Groundwater	4	40	Yes
41	RIVERTON, CITY OF Riverton	Riverton	Surface Water	3	10,330	Yes
42	BRIDGER VALLEY JOINT POWERS BOARD Mountain View	Mountain View	Surface Water	3	1,728	Yes
43	LUSK, TOWN OF Lusk	Lusk	Groundwater	3	1,576	Yes
44	MARBLETON, TOWN OF Marbleton	Marbleton	Groundwater	3	861	Yes
45	BEDFORD WATER & SEWER DISTRICT Bedford	Bedford	Groundwater	3	750	Yes
46	WAMSUTTER, TOWN OF Wamsutter	Wamsutter	Groundwater	3	500	Yes
47	LINDLEY PARK, LLC Evanston	Evanston	Groundwater	3	362	Yes
48	GARDENS NORTH HOMEOWNERS ASSOCIATION Dubois	Dubois	Groundwater	3	300	Yes
49	GROVER WATER & SEWER DISTRICT Grover	Grover	Groundwater	3	252	Yes
50	SUNRIDGE ESTATES Riverton	Riverton	Groundwater	3	220	Yes
51	ALBIN, TOWN OF Albin	Albin	Groundwater	3	181	Yes
52	MOUNTAIN VIEW ACRES Pavillion	Pavillion	Groundwater	3	165	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	RESTWAY TRAVEL PARK Cheyenne	Cheyenne	Groundwater	3	62	Yes
57	ROCK SPRINGS/GREEN RIVER JPB Green River	Green River	Surface Water	3	25	Yes
58	ARAPAHOE COMM WATER SYSTEM Ethete	Ethete	Groundwater	2	4,100	Yes
59	GLENROCK, TOWN OF Glenrock	Glenrock	Groundwater	2	2,466	Yes
60	RAFTER J SUBDIVISION HOA Wilson	Wilson	Groundwater	2	1,500	Yes
61	MOORCROFT, TOWN OF Moorcroft	Moorcroft	Groundwater	2	1,009	Yes
62	COWLEY, TOWN OF Cowley	Cowley	Groundwater	2	800	Yes
63	ARAPAHOE INDUSTRIAL PARK Fort Washakie	Fort Washakie	Groundwater	2	650	Yes
64	HUDSON, TOWN OF Hudson	Hudson	Surface Water	2	460	Yes
65	NATRONA COUNTY INT'L AIRPORT Casper	Casper	Surface Water	2	423	Yes
66	COUNTRYSIDE WATER USERS, INC. Gillette	Gillette	Groundwater	2	360	Yes
67	SUPERIOR, TOWN OF Superior	Superior	Groundwater	2	336	Yes
68	ORCHARD VALLEY WATER COMPANY Cheyenne	Cheyenne	Groundwater	2	260	Yes
69	FAIRVIEW WATER & SEWER DISTRICT Grover	Grover	Groundwater	2	230	Yes
70	CHUGWATER, TOWN OF Chugwater	Chugwater	Groundwater	2	200	Yes
71	ELK MOUNTAIN, TOWN OF Elk Mountain	Elk Mountain	Groundwater	2	191	Yes
72	SQUAW CREEK WATER DISTRICT Wilson	Wilson	Groundwater	2	160	Yes
73	FIRST FIKE SUBDIVISION Pavillion	Pavillion	Groundwater	2	150	Yes
74	INDIAN PAINTBRUSH WATER DISTRICT Wilson	Wilson	Groundwater	2	150	Yes
75	CENTENNIAL WATER AND SEWER DISTRICT Laramie	Laramie	Groundwater	2	150	Yes
76	COUNTRYSIDE COURT Mills	Mills	Groundwater	2	125	Yes
77	MANDERSON, TOWN OF Basin	Basin	Groundwater	2	110	Yes
78	RED LANE DOMESTIC WATER, INC. Thermopolis	Thermopolis	Surface Water	2	110	Yes
79	TURNERVILLE WATER AND SEWER DISTRICT Grover	Grover	Surface Water	2	90	Yes
80	HI-COUNTRY WATER DISTRICT Wilson	Wilson	Groundwater	2	85	Yes
81	LAKEVIEW MOBILE HOME PARK Gillette	Gillette	Groundwater	2	36	Yes
82	EVERGREEN MOBILE HOME PARK Cheyenne	Cheyenne	Groundwater	2	35	Yes
83	BIG VALLEY & CROSSED ARROWS IMP DIST Meeteetse	Meeteetse	Groundwater	2	35	Yes
84	SHERIDAN, CITY OF Sheridan	Sheridan	Surface Water	1	22,700	Yes
85	YNP - LAKE VILLAGE Yellowstone	Yellowstone	Surface Water	1	5,925	Yes
86	NEWCASTLE, CITY OF Newcastle	Newcastle	Groundwater	1	3,595	Yes
87	PINEDALE MUNICIPAL WS Pinedale	Pinedale	Surface Water	1	1,900	Yes
88	DUBOIS, TOWN OF Dubois	Dubois	Groundwater	1	1,822	Yes
89	SUNDANCE, CITY OF Sundance	Sundance	Groundwater	1	1,279	Yes
90	MOUNTAIN VIEW, TOWN OF Mountain View	Mountain View	Surface Water	1	1,250	Yes
91	UPTON, TOWN OF Upton	Upton	Groundwater	1	1,100	Yes
92	HERITAGE VILLAGE SUBDIVISION Gillette	Gillette	Groundwater	1	750	Yes
93	FARSON EDEN SCHOOL Rock Springs	Rock Springs	Groundwater	1	530	Yes
94	ENCAMPMENT, TOWN OF Encampment	Encampment	Surface Water	1	450	Yes
95	BIG PINEY, TOWN OF Big Piney	Big Piney	Groundwater	1	445	Yes
96	OSMOND I&S DISTRICT Afton	Afton	Groundwater	1	315	Yes
97	JUBYS MOBILE HOME PARK Cody	Cody	Surface Water	1	300	Yes
98	BAR Y ESTATES/GROS VENTRE WEST WTR DISTS Wilson	Wilson	Groundwater	1	270	Yes
99	WEST END WATER DISTRICT Newcastle	Newcastle	Groundwater	1	225	Yes
100	GTNP--MOOSE/BEAVER CREEK Moose	Moose	Groundwater	1	221	Yes
101	OSAGE WATER DISTRICT Osage	Osage	Groundwater	1	200	Yes
102	POISON SPIDER I&S DISTRICT Casper	Casper	Surface Water	1	200	Yes
103	B&K MOBILE HOME PARK Pavillion	Pavillion	Groundwater	1	200	Yes
104	JADE MHC Riverton	Riverton	Groundwater	1	200	Yes
105	MEDICINE WATERS VILLAGE Rawlins	Rawlins	Groundwater	1	200	Yes
106	STONE GATE ESTATES Gillette	Gillette	Groundwater	1	198	Yes
107	WATER UNLIMITED, INCORPORATED Newcastle	Newcastle	Groundwater	1	144	Yes
108	ETNA WATER & SEWER DISTRICT Grover	Grover	Groundwater	1	135	Yes
109	YODER, TOWN OF Yoder	Yoder	Groundwater	1	131	Yes
110	SEVEN MILE WATER & SEWER DISTRICT Laramie	Laramie	Surface Water	1	130	Yes
111	A & J MOBILE HOME PARK Pavillion	Pavillion	Groundwater	1	100	Yes
112	TETON SHADOWS HOA Wilson	Wilson	Groundwater	1	100	Yes
113	PLAY PARK LLC Gillette	Gillette	Groundwater	1	96	Yes
114	CARPENTER W&S DISTRICT Cheyenne	Cheyenne	Groundwater	1	94	Yes
115	WESTVIEW VILLAGE Grover	Grover	Groundwater	1	83	Yes
116	POINT OF ROCKS MERCANTILE Point Of Rocks	Point Of Rocks	Groundwater	1	78	Yes
117	BAIROIL, TOWN OF Bairoil	Bairoil	Groundwater	1	71	Yes
118	FARVIEW WATER AND SEWER DISTRICT Pavillion	Pavillion	Groundwater	1	60	Yes
119	MILE-HI I&S DISTRICT Casper	Casper	Surface Water	1	48	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 (194)

194 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 (11,727) 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) USAF F.E. WARREN AFB (5,500) WORLAND UTILITIES COMMISSION (4,787) GTNP-COLTER BAY VILLAGE (4,514) BAR NUNN, TOWN OF (4,000) WRIGHT WATER & SEWER DISTRICT (3,207) WHITE MOUNTAIN W&S DISTRICT (3,000) EVANSVILLE, TOWN OF (2,873) THERMOPOLIS, TOWN OF (2,775) FORT WASHAKIE (2,620) YNP-MAMMOTH HOT SPRINGS (2,600) SLEEPY HOLLOW SUBDIVISION (2,400) LOVELL, TOWN OF (2,250) LYMAN, TOWN OF (2,203) GREYBULL, TOWN OF (2,080) 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) GREATER SMOOT W&S DISTRICT (720) +144 more

All Water Systems in Wyoming (317)

Page 5 of 7, ordered by population served.

System	Population Served	Violations
WATER UNLIMITED, INCORPORATED	144	1
SOUTHFORK ESTATES	144	3
BENNOR ESTATES & IMPROVEMENT DISTRICT	144	13
EAGLE RIDGE MHP, LLC	140	0
GREEN VALLEY ESTATES I&S DISTRICT	140	0
GRANGER, TOWN OF	139	6
ETNA WATER & SEWER DISTRICT	135	1
FAIRWAY ESTATES	135	0
YODER, TOWN OF	131	1
PLEASANT VIEW WATER COMPANY	130	0
SEVEN MILE WATER & SEWER DISTRICT	130	1
SIERRA MADRE JPB	130	0
HIGHLAND RANCH ESTATES	128	0
NORTH GURLEY MOBILE HOME PARK	128	0
COUNTRYSIDE COURT	125	2
SOUTH RIVERSIDE ACRES WTR IMPR DIST	125	0
SHELL TOWN WATER IMPROVEMENT DISTRICT	120	0
VISTA WEST IMPROVEMENT & SERV DISTRICT	120	0
TARGHEE TOWNE WATER DISTRICT	120	0
EIGHT MILE SUBDIVISION	120	0
SECTION 4 WATER SYSTEM INCORPORATED	120	0
TOWN OF ALPINE - MEGA WELL	120	0
CLEARMONT, TOWN OF	116	0
DIXON, TOWN OF	114	93
DESERT TRAILS MHP	112	0
MANDERSON, TOWN OF	110	2
RED LANE DOMESTIC WATER, INC.	110	2
MOBILE CORRALS MHP	110	0
HIDE-A-WAY MOBILE VILLAGE	107	3
KEY LARGO UTILITIES	105	11
HOY MOBILE HOME PARK	100	5
A & J MOBILE HOME PARK	100	1
TETON SHADOWS HOA	100	1
RIVERMEADOWS WATER DISTRICT	100	10
RAINTREE ESTATES	100	0
DILLMAN ESTATES	100	0
VALLEY VIEW MUTUAL WATER COMPANY	100	0
TRAIL RIDGE WATER SYSTEM	100	0
THIRTY-THREE MILE ROAD I&S DISTRICT	100	0
STONE CREEK HOA	100	30
OWL CREEK WATER DISTRICT	100	6
MANVILLE, TOWN OF	97	7
PLAY PARK LLC	96	1
RIVERS BEND TRAILER COURT	96	0
COTTONWOOD ACRES	95	30
CARPENTER W&S DISTRICT	94	1
RIVER MEADOWS	90	0
TURNERVILLE WATER AND SEWER DISTRICT	90	2
HI-COUNTRY WATER DISTRICT	85	2
ROZET RANCHETTES I&S DISTRICT	85	6

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Frequently Asked Questions

How many water systems are in Wyoming?

Wyoming has 317 community water systems tracked by the EPA, serving a combined population of 539,928 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.

How many health-based violation records are in this extract for Wyoming?

PlainEnviro's health-based EPA SDWIS extract contains 730 records joined to 317 active community water systems in Wyoming. Monitoring and reporting records are not included.

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Wyoming Water Quality → Wyoming Environmental Overview → All States →

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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

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

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