State drinking water records
Wyoming drinking water systems
327 community water systems serve Wyoming and are listed below under 23 counties and on the pages of 153 cities and towns. Their own population figures add up to 545,539 people, a sum that counts people twice where one system sells water to another.
116 of them (35%) had at least one health-based violation in the last 10 years. 64 systems still have one unresolved.
218 rely mainly on groundwater and 109 on surface water, counting water bought from other systems.
318 systems filed a lead service line inventory listing 674 lead lines, 2,853 galvanized lines that must be replaced and 83,820 lines of unknown material.
16 systems are placed by the county their records name: EPA has no service area map for 15 of them, and 1 has one that does not line up with its own records.
- Community water systems
- 327
- People served, sum of each system's own figure
- 545,539
- Systems with a health-based violation, last 10 years
- 116
- Systems with one unresolved
- 64
- Lead service lines in inventories
- 674
Counties
23 countiesEach county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.
| County | Systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Albany County | 9 | 34,686 | 2 | 1 |
| Big Horn County | 16 | 10,452 | 3 | 5 |
| Campbell County | 44 | 47,701 | 9 | 0 |
| Carbon County | 10 | 13,474 | 6 | 2 |
| Converse County | 8 | 10,359 | 1 | 2 |
| Crook County | 7 | 3,409 | 3 | 1 |
| Fremont County | 24 | 32,036 | 17 | 11 |
| Goshen County | 10 | 8,957 | 3 | 1 |
| Hot Springs County | 7 | 4,079 | 2 | 2 |
| Johnson County | 3 | 4,832 | 1 | 1 |
| Laramie County | 19 | 85,673 | 9 | 3 |
| Lincoln County | 28 | 15,788 | 17 | 5 |
| Natrona County | 18 | 74,939 | 4 | 4 |
| Niobrara County | 3 | 1,718 | 2 | 1 |
| Park County | 11 | 33,289 | 2 | 3 |
| Platte County | 6 | 5,542 | 2 | 1 |
| Sheridan County | 6 | 26,048 | 1 | 0 |
| Sublette County | 4 | 3,786 | 3 | 3 |
| Sweetwater County | 25 | 46,702 | 9 | 8 |
| Teton County | 37 | 53,125 | 10 | 3 |
| Uinta County | 5 | 18,381 | 3 | 0 |
| Washakie County | 4 | 6,902 | 0 | 1 |
| Weston County | 9 | 6,201 | 3 | 5 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Cheyenne Board of Public Utilities | Laramie County | 64,165 | Surface water | 0 | 0 | 82 |
| City of Casper | Natrona County | 59,000 | Purchased surface water | 0 | 0 | 146 |
| City of Laramie | Albany County | 32,395 | Surface water | 0 | 0 | 0 |
| City of Gillette | Campbell County | 32,222 | Groundwater | 0 | 0 | 0 |
| Town of Jackson | Teton County | 24,760 | Groundwater | 0 | 2 | 0 |
| City of Rock Springs | Sweetwater County | 24,000 | Purchased surface water | 0 | 0 | 1 |
| City of Sheridan | Sheridan County | 22,700 | Surface water | 0 | 0 | 397 |
| City of Evanston | Uinta County | 12,000 | Surface water | 0 | 0 | 0 |
| City of Green River | Sweetwater County | 10,500 | Purchased surface water | 0 | 0 | 0 |
| City of Riverton | Fremont County | 10,330 | Surface water | 2 | 0 | 0 |
| City of Cody | Park County | 10,224 | Purchased surface water | 0 | 0 | 5 |
| South Cheyenne Water & Sewer District | Laramie County | 10,000 | Purchased surface water | 0 | 0 | 0 |
| City of Rawlins Water Supply | Carbon County | 9,006 | Surface water | 5 | 1 | 0 |
| Ynp-Old Faithful | Teton County | 7,675 | Surface water | 10 | 0 | 0 |
| City of Lander | Fremont County | 7,615 | Surface water | 1 | 0 | 0 |
Systems with unresolved health-based violations
64 systems| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| B&K Mobile Home Park | Fremont County | 200 | Groundwater | 1 | 4 | 0 |
| South End Water Users S&I District | Big Horn County | 150 | Purchased groundwater | 0 | 4 | 0 |
| Water Unlimited, Incorporated | Weston County | 144 | Groundwater | 1 | 4 | 0 |
| Red Lane Domestic Water, Inc. | Hot Springs County | 110 | Purchased surface water | 2 | 4 | 0 |
| Lakeview I&S District | Natrona County | 62 | Purchased surface water | 0 | 4 | 0 |
| Big Valley & Crossed Arrows Imp Dist | Park County | 35 | Groundwater | 2 | 4 | 0 |
| Town of Superior | Sweetwater County | 336 | Groundwater | 2 | 3 | 1 |
| West End Water District | Weston County | 225 | Groundwater | 0 | 3 | 0 |
| Town of Albin | Laramie County | 181 | Groundwater | 3 | 3 | No inventory |
| Hyattville S&I District | Big Horn County | 66 | Groundwater | 0 | 3 | 0 |
| Second Fike Subdivision | Fremont County | 34 | Groundwater | 1 | 3 | 0 |
| Evergreen Mobile Home Park | Laramie County | 26 | Groundwater | 2 | 3 | 0 |
| Town of Jackson | Teton County | 24,760 | Groundwater | 0 | 2 | 0 |
| Town of Star Valley Ranch | Lincoln County | 2,030 | Groundwater | 2 | 2 | 0 |
| Town of Ten Sleep | Washakie County | 400 | Groundwater | 0 | 2 | 1 |
| Lucerne Water and Sewer Dist. | Hot Springs County | 350 | Purchased groundwater | 0 | 2 | 0 |
| Gardens North Homeowners Association | Fremont County | 300 | Groundwater | 3 | 2 | 0 |
| Medicine Waters Village | Carbon County | 200 | Purchased groundwater | 1 | 2 | No inventory |
| Mountain View Acres | Fremont County | 165 | Groundwater | 2 | 2 | 0 |
| Sandy Lake Estates I&S District | Natrona County | 150 | Purchased surface water | 0 | 2 | 0 |
| Canyon Improvement & Service District | Weston County | 79 | Groundwater | 0 | 2 | 0 |
| Farview Water and Sewer District | Fremont County | 60 | Groundwater | 0 | 2 | 0 |
| City of Rawlins Water Supply | Carbon County | 9,006 | Surface water | 5 | 1 | 0 |
| Ynp - Lake Village | Teton County and 1 other county | 5,925 | Groundwater | 1 | 1 | 0 |
| Town of Greybull | Big Horn County | 3,260 | Groundwater | 0 | 1 | 0 |
| Town of Glenrock | Converse County | 2,466 | Groundwater | 1 | 1 | 0 |
| Little America Hotels & Resorts, Inc- Wy | Sweetwater County | 2,004 | Surface water | 20 | 1 | 0 |
| Ethete Water System | Fremont County | 1,950 | Surface water | 6 | 1 | 0 |
| Town of Dubois | Fremont County | 1,822 | Groundwater | 1 | 1 | 0 |
| Rafter J Subdivision HOA | Teton County | 1,500 | Groundwater | 1 | 1 | 0 |
| Clearview I&S District | Sweetwater County | 930 | Purchased surface water | 0 | 1 | 0 |
| Town of Marbleton | Sublette County | 861 | Groundwater | 2 | 1 | 0 |
| Town of Cowley | Big Horn County | 800 | Groundwater | 2 | 1 | 2 |
| Salt Creek Water District | Weston County | 600 | Groundwater | 0 | 1 | 0 |
| High Meadow Ranch | Sublette County | 580 | Groundwater | 0 | 1 | 0 |
| Farson Eden School | Sweetwater County | 530 | Groundwater | 1 | 1 | 0 |
| Town of Wamsutter | Sweetwater County | 500 | Groundwater | 3 | 1 | 0 |
| Town of Hudson | Fremont County | 460 | Groundwater under direct influence | 1 | 1 | 0 |
| South Torrington Water District | Goshen County | 450 | Purchased groundwater | 0 | 1 | 0 |
| Town of Big Piney | Sublette County | 445 | Groundwater | 1 | 1 | 0 |
| Lewis Mobile Home Park | Sweetwater County | 370 | Purchased surface water | 0 | 1 | 0 |
| Town of La Barge | Lincoln County | 347 | Surface water | 2 | 1 | 0 |
| Town of Glendo | Platte County | 289 | Groundwater | 0 | 1 | 0 |
| Grover Water & Sewer District | Lincoln County | 252 | Groundwater | 3 | 1 | 0 |
| Osage Water District | Weston County | 240 | Groundwater | 1 | 1 | 0 |
| Air Base Acres I&S District | Natrona County | 236 | Purchased surface water | 0 | 1 | 0 |
| Sunridge Estates | Fremont County | 220 | Groundwater | 3 | 1 | 0 |
| Jade MHC | Fremont County | 200 | Groundwater | 1 | 1 | 0 |
| North Alpine I&S District | Lincoln County | 200 | Groundwater | 0 | 1 | 0 |
| Bald Mountain Trailer Court | Johnson County | 150 | Groundwater | 0 | 1 | 0 |
| Sierra Madre JPB | Carbon County | 130 | Groundwater | 0 | 1 | 0 |
| Highland Ranch Estates | Laramie County | 128 | Groundwater | 0 | 1 | 0 |
| Countryside Court | Natrona County | 125 | Groundwater | 2 | 1 | No inventory |
| Shell Town Water Improvement District | Big Horn County | 120 | Purchased groundwater | 0 | 1 | 0 |
| Thirty-Three Mile Road I&S District | Natrona County | 100 | Purchased surface water | 0 | 1 | 0 |
| Rivers Bend Trailer Court | Park County | 96 | Purchased surface water | 0 | 1 | 0 |
| Star View Estates | Lincoln County | 84 | Groundwater | 0 | 1 | 0 |
| Point of Rocks Mercantile | Sweetwater County | 78 | Groundwater | 1 | 1 | 0 |
| Town of Bairoil | Sweetwater County | 71 | Groundwater | 1 | 1 | 0 |
| Antelope Ridge HOA | Albany County | 70 | Groundwater | 0 | 1 | 0 |
| Sundance Meadows Spid | Converse County | 50 | Purchased surface water | 0 | 1 | 0 |
| Beulah Land Water | Crook County | 50 | Groundwater | 3 | 1 | 0 |
| Lance Creek Water District | Niobrara County | 45 | Groundwater | 32 | 1 | 0 |
| Jeffrey City Water & Sewer District | Fremont County | 40 | Groundwater | 3 | 1 | 0 |
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations