418 community and non-transient non-community water systems are listed for Wyoming in EPA SDWIS. 34 were sampled under UCMR 5; 4 of those had at least one PFAS result at or above the reporting level, and 2 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
Wyoming map · Download: systems (CSV) · all results (CSV, gzip)
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Sampled under UCMR 5 (34)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Bar Nunn, Town Of | WY5600067 | Bar Nunn | 4,000 | <MRL | <MRL | 0 | No PFAS detected |
| Black Thunder Coal Mine | WY5600360 | Wright | 600 | <MRL | <MRL | 0 | No PFAS detected |
| Buffalo, City Of | WY5600005 | Buffalo | 4,419 | <MRL | <MRL | 0 | No PFAS detected |
| Casper, City Of | WY5601415 | Casper | 59,000 | <MRL | <MRL | 0 | No PFAS detected |
| Cheyenne Board Of Public Utilities | WY5600011 | Cheyenne | 64,165 | <MRL | <MRL | 0 | No PFAS detected |
| Cody, City Of | WY5600207 | Cody | 10,224 | <MRL | <MRL | 0 | No PFAS detected |
| Douglas, City Of | WY5600137 | Douglas | 6,400 | <MRL | <MRL | 0 | Other PFAS detected |
| Evanston, City Of | WY5600150 | Evanston | 11,727 | <MRL | <MRL | 0 | No PFAS detected |
| First Fike Subdivision | WY5600194 | Pavillion | 150 | <MRL | <MRL | 0 | No PFAS detected |
| Fort Washakie | 085690003 | Fort Washakie | 2,620 | 9.3 | <MRL | 0 | PFOA 1–3 × its limit |
| Gillette, City Of | WY5600019 | Gillette | 32,222 | <MRL | <MRL | 0 | No PFAS detected |
| Green River, City Of | WY5601181 | Green River | 10,500 | <MRL | <MRL | 0 | No PFAS detected |
| Gtnp-Colter Bay Village | WY5680095 | Moose | 4,514 | <MRL | <MRL | 0 | No PFAS detected |
| High Meadow Ranch | WY5601569 | Pinedale | 622 | <MRL | <MRL | 0 | No PFAS detected |
| Jackson, Town Of | WY5600213 | Jackson | 24,760 | <MRL | <MRL | 0.33 | Hazard Index below its limit |
| Kemmerer-Diamondville Jpb | WY5600028 | Kemmerer | 3,348 | <MRL | <MRL | 0 | No PFAS detected |
| Lander, City Of | WY5600176 | Lander | 7,615 | <MRL | <MRL | 0 | No PFAS detected |
| Laramie, City Of | WY5600029 | Laramie | 32,395 | <MRL | <MRL | 0 | No PFAS detected |
| Lovell, Town Of | WY5600031 | Lovell | 2,250 | <MRL | <MRL | 0 | No PFAS detected |
| Mills, City Of | WY5600036 | Mills | 4,050 | <MRL | <MRL | 0 | No PFAS detected |
| Newcastle, City Of | WY5600256 | Newcastle | 3,595 | <MRL | <MRL | 0 | No PFAS detected |
| Northwest Rural Water District | WY5601254 | Cody | 7,330 | <MRL | <MRL | 0 | No PFAS detected |
| Powell, City Of | WY5600042 | Powell | 6,310 | <MRL | <MRL | 0 | No PFAS detected |
| Rawlins Water Supply, City Of | WY5600045 | Rawlins | 9,006 | <MRL | <MRL | 0 | No PFAS detected |
| Riverton, City Of | WY5600047 | Riverton | 10,330 | <MRL | 7 | 3.707 | Hazard Index ≥ 3 × its limit |
| Rock Springs, City Of | WY5601182 | Rock Springs | 24,000 | <MRL | <MRL | 0 | No PFAS detected |
| Sheridan, City Of | WY5600052 | Sheridan | 22,700 | <MRL | <MRL | 0 | No PFAS detected |
| South Cheyenne Water & Sewer District | WY5600239 | Cheyenne | 10,000 | <MRL | <MRL | 0 | No PFAS detected |
| Torrington Municipal Water Dept, City Of | WY5600164 | Torrington | 6,847 | <MRL | <MRL | 0 | No PFAS detected |
| Usaf F.E. Warren Afb | WY5680122 | F.E. Warren Afb | 5,500 | <MRL | <MRL | 0 | No PFAS detected |
| Wheatland, Town Of | WY5600187 | Wheatland | 3,659 | <MRL | <MRL | 0 | No PFAS detected |
| Worland Utilities Commission | WY5600197 | Worland | 4,787 | <MRL | <MRL | 0 | No PFAS detected |
| Ynp-Canyon Village | WY5680074 | Yellowstone | 4,300 | <MRL | <MRL | 0 | No PFAS detected |
| Ynp-Old Faithful | WY5680085 | Yellowstone | 7,745 | <MRL | <MRL | 0 | No PFAS detected |
Not tested under UCMR 5 (384)
UCMR 5 required monitoring by systems serving 3,300 or more people and by a representative sample of smaller systems. The systems below have no UCMR 5 results in EPA's data. Not tested is not the same as not detected: the absence of results says nothing about PFAS in their water.
| System | PWSID | Type | City | Population | Counties |
|---|---|---|---|---|---|
| A & J Mobile Home Park | WY5600179 | CWS | Pavillion | 100 | Fremont County |
| Afton, Board Of Pub Utilities | WY5600002 | CWS | Afton | 2,000 | Lincoln County |
| Air Base Acres I&S District | WY5600080 | CWS | Casper | 236 | Natrona County |
| Albin, Town Of | WY5600189 | CWS | Albin | 181 | Laramie County |
| Alpine Science Institute | WY5601366 | NTNCWS | Lander | 85 | Fremont County |
| Alpine, Town Of | WY5600156 | CWS | Alpine | 1,300 | Lincoln County |
| Alta School | WY5601561 | NTNCWS | Jackson | 38 | Teton County |
| American Colloid Company | WY5601252 | NTNCWS | Colony | 93 | Big Horn County |
| American Colloid-Colony East | WY5601235 | NTNCWS | Colony | 45 | Crook County |
| American Colloid-Colony West | WY5601236 | NTNCWS | Colony | 60 | Crook County |
| American Road W&S District | WY5600968 | CWS | Gillette | 220 | Campbell County |
| American Soda Llc | WY5600914 | NTNCWS | Green River | 450 | Sweetwater County |
| Antelope Ridge Hoa | WY5601457 | CWS | Laramie | 70 | Albany County |
| Antelope Valley I&S District (Avisd) | WY5600251 | CWS | Gillette | 1,280 | Campbell County |
| Arapahoe Comm Water System | 085690004 | CWS | Ethete | 4,100 | Fremont County |
| Arapahoe Industrial Park | 085690008 | CWS | Fort Washakie | 650 | Fremont County |
| Arng-Camp Guernsey Cantonment | WY5600797 | NTNCWS | Guernsey | 2,000 | Platte County |
| Aspens Pines W&S District | WY5600220 | CWS | Wilson | 1,400 | Teton County |
| B&K Mobile Home Park | WY5600180 | CWS | Pavillion | 200 | Fremont County |
| Baggs, Town Of | WY5600058 | CWS | Baggs | 400 | Carbon County |
| Bairoil, Town Of | WY5600003 | CWS | Bairoil | 60 | Sweetwater County |
| Bald Mountain Trailer Court | WY5600258 | CWS | Gillette | 150 | Johnson County |
| Bar Y Estates/Gros Ventre West Wtr Dists | WY5600976 | CWS | Wilson | 270 | Teton County |
| Bar-B-Bar Meadows | WY5601439 | CWS | Wilson | 55 | Teton County |
| Basin Electric Power Co-Op | WY5600817 | NTNCWS | Wheatland | 310 | Platte County |
| Basin, Town Of | WY5600004 | CWS | Basin | 1,250 | Big Horn County |
| Bear River Regional Joint Powers | WY5601019 | CWS | Bear River | 1,200 | Uinta County |
| Bedford Water & Sewer District | WY5600006 | CWS | Bedford | 750 | Lincoln County |
| Bennor Estates & Improvement District | WY5601596 | CWS | Gillette | 144 | Campbell County |
| Bentonite Performance Minerals - Colony | WY5601476 | NTNCWS | Belle Fourche | 180 | Crook County |
| Bentonite Performance Minerals/Lovell | WY5601475 | NTNCWS | Lovell | 68 | Big Horn County |
| Beulah Land Water | WY5601692 | CWS | Sioux Falls | 50 | Crook County |
| Big Country Estates | WY5601271 | CWS | Cheyenne | 615 | Laramie County |
| Big Horn Regional Jpb | WY5601630 | CWS | Worland | 25 | Washakie County |
| Big Piney, Town Of | WY5600007 | CWS | Big Piney | 445 | Sublette County |
| Big Valley & Crossed Arrows Imp Dist | WY5601193 | CWS | Meeteetse | 35 | Park County |
| Bighorn Mountain Campground | WY5600229 | CWS | Buffalo | 29 | Johnson County |
| Black Butte Coal Company | WY5600638 | NTNCWS | Point Of Rocks | 150 | Sweetwater County |
| Black Hills Power Incorporated | WY5600135 | NTNCWS | Gillette | 154 | Campbell County |
| Black Thunder East, Llc Admin | WY5600924 | NTNCWS | Wright | 650 | Campbell County |
| Breazeale'S Mobile Home Park | WY5601279 | CWS | Farmington Hills | 345 | Albany County |
| Bridger Coal Company-Admin | WY5601634 | NTNCWS | Point Of Rocks | 191 | Sweetwater County |
| Bridger Valley Joint Powers Board | WY5600757 | CWS | Mountain View | 1,728 | Uinta County |
| Broken Wheel Truck Stop | WY5601001 | NTNCWS | Douglas | 540 | Converse County |
| Broken Wrench Llc | WY5600074 | CWS | Casper | 30 | Natrona County |
| Buckmiller Enterprises, Llc | WY5601695 | CWS | Gillette | 33 | Crook County |
| Buckskin Mining Company-Kiewit Corp | WY5600818 | NTNCWS | Gillette | 80 | Campbell County |
| Buffalo Valley Water District | WY5600435 | CWS | Moran | 50 | Teton County |
| Burlington, Town Of | WY5601098 | CWS | Burlington | 348 | Big Horn County |
| Burns Board Of Public Utilities | WY5600188 | CWS | Burns | 1,024 | Laramie County |
| Byron, Town Of | WY5600008 | CWS | Byron | 561 | Big Horn County |
| C-V Ranches (Boces Reg V) | WY5600806 | CWS | Wilson | 51 | Teton County |
| Cambria I&S District | WY5601028 | CWS | Newcastle | 148 | Weston County |
| Canyon Improvement & Service District | WY5601632 | CWS | Newcastle | 79 | Weston County |
| Carpenter W&S District | WY5601464 | CWS | Cheyenne | 94 | Laramie County |
| Cathedral Home | WY5600880 | NTNCWS | Laramie | 275 | Albany County |
| Cedar Hills Water Association | WY5600780 | CWS | Gillette | 258 | Campbell County |
| Cedar Springs Meadows | WY5601720 | CWS | Thayne | 19 | Lincoln County |
| Centennial Water And Sewer District | WY5601232 | CWS | Laramie | 150 | Albany County |
| Central Wy Regional Water System Jpb | WY5600009 | CWS | Casper | 25 | Natrona County |
| Chugwater, Town Of | WY5600200 | CWS | Chugwater | 200 | Platte County |
| Cimmaron Village | WY5601315 | CWS | Cheyenne | 327 | Laramie County |
| Clearmont, Town Of | WY5600013 | CWS | Clearmont | 116 | Sheridan County |
| Clearview I&S District | WY5600091 | CWS | Rock Springs | 930 | Sweetwater County |
| Coal Creek Mine-Thunder Basin Coal Co | WY5600920 | NTNCWS | Wright | 105 | Campbell County |
| Cokeville, Town Of | WY5600015 | CWS | Cokeville | 535 | Lincoln County |
| Contango Resources, Llc- Clark Fork | WY5600906 | NTNCWS | Tulsa | 60 | Park County |
| Cook Road Water District | WY5601399 | CWS | Gillette | 291 | Campbell County |
| Copperleaf Water System | WY5601728 | CWS | Cody | 42 | Park County |
| Cottonwood Acres | WY5601233 | CWS | Torrington | 95 | Goshen County |
| Countryside Court | WY5600756 | CWS | Mills | 125 | Natrona County |
| Countryside Water Users, Inc. | WY5600192 | CWS | Gillette | 360 | Campbell County |
| Cowley, Town Of | WY5600206 | CWS | Cowley | 800 | Big Horn County |
| Crestview Estates Subdivision | WY5600853 | CWS | Gillette | 500 | Campbell County |
| Cv Laramie Mhp, Llc | WY5600162 | CWS | Cedaredge | 375 | Albany County |
| Dave Johnston Power Plant | WY5600291 | NTNCWS | Glenrock | 201 | Converse County |
| Dayton, Town Of | WY5600202 | CWS | Dayton | 957 | Sheridan County |
| Deaver Municipal Water System | WY5600016 | CWS | Deaver | 176 | Big Horn County |
| Desert Trails Mhp | WY5601608 | CWS | Green River | 112 | Sweetwater County |
| Devils Tower Forest Products | WY5601651 | NTNCWS | Spearfish | 90 | Crook County |
| Dillman Estates | WY5601248 | CWS | Torrington | 100 | Goshen County |
| Dixon, Town Of | WY5600059 | CWS | Dixon | 114 | Carbon County |
| Douglas Koa Cg & Pine Meadows Mhp | WY5600247 | CWS | Douglas | 165 | Converse County |
| Downer Neighborhood I&S District | WY5601537 | CWS | Sheridan | 400 | Sheridan County |
| Dry Fork Station | WY5601638 | NTNCWS | Gillette | 75 | Campbell County |
| Dubois, Town Of | WY5600177 | CWS | Dubois | 1,822 | Fremont County |
| Dyno Nobel, Inc | WY5600910 | NTNCWS | Cheyenne | 176 | Laramie County |
| Eagle Ridge Mhp, Llc | WY5600119 | CWS | Gillette | 140 | Campbell County |
| Eagle Spec. Mat., Llc-Eagle Butte Mine | WY5600357 | NTNCWS | Gillette | 277 | Campbell County |
| Eagle Special. Mats, Llc-Rawhide School | WY5600123 | NTNCWS | Gillette | 295 | Campbell County |
| Eagle Specialty Materials, Llc-Belle Ayr | WY5600356 | NTNCWS | Gillette | 300 | Campbell County |
| East Thermopolis, Town Of | WY5600226 | CWS | East Thermopolis | 254 | Hot Springs County |
| Eastview Manufactured Home Community | WY5601353 | CWS | Gillette | 688 | Campbell County |
| Edgerton, Town Of | WY5600017 | CWS | Edgerton | 195 | Natrona County |
| Eight Mile Subdivision | WY5600829 | CWS | Gillette | 120 | Campbell County |
| Elk Mountain, Town Of | WY5600065 | CWS | Elk Mountain | 191 | Carbon County |
| Emerald River Estates | WY5601213 | CWS | Wasilla | 62 | Sweetwater County |
| Encampment, Town Of | WY5600060 | CWS | Encampment | 450 | Carbon County |
| Englewood Village Mhp | WY5601304 | CWS | Cheyenne | 152 | Laramie County |
| Ethete Water System | 085690002 | CWS | Fort Washakie | 1,950 | Fremont County |
| Etna Water & Sewer District | WY5600157 | CWS | Thayne | 135 | Lincoln County |
| Evans Mobile Home Court | WY5600215 | CWS | Wilson | 150 | Teton County |
| Evansville, Town Of | WY5600018 | CWS | Evansville | 2,873 | Natrona County |
| Evergreen Mobile Home Park | WY5600021 | CWS | Los Altos | 35 | Laramie County |
| Exxon Mobil - Shute Creek Gas Plant | WY5600919 | NTNCWS | Kemmerer | 250 | Lincoln County |
| Exxon Mobil-Labarge Sw Division | WY5601099 | NTNCWS | Kemmerer | 35 | Sublette County |
| Fairview Water & Sewer District | WY5600166 | CWS | Thayne | 230 | Lincoln County |
| Fairway Estates | WY5600918 | CWS | Douglas | 135 | Converse County |
| Farson Eden School | WY5600113 | CWS | Rock Springs | 530 | Sweetwater County |
| Farson Mobile Home Court | WY5600112 | CWS | Rock Springs | 20 | Sweetwater County |
| Farview Water And Sewer District | WY5601546 | CWS | Pavillion | 60 | Fremont County |
| Fish Creek Improvement And Service Dist | WY5601473 | CWS | Wilson | 210 | Teton County |
| Flying J Travel Plaza | WY5600102 | NTNCWS | Sinclair | 425 | Carbon County |
| Foothills Mobile Home Park | WY5601239 | CWS | Gillette | 735 | Campbell County |
| Force Road Joint Powers Board | WY5600148 | CWS | Gillette | 195 | Campbell County |
| Fort Laramie, Town Of | WY5600185 | CWS | Fort Laramie | 230 | Goshen County |
| Four J School Campbell Sch Dis | WY5601056 | NTNCWS | Gillette | 50 | Campbell County |
| Fox Park Subdivision | WY5600745 | CWS | Gillette | 843 | Campbell County |
| Fox Ridge Water System | WY5601615 | CWS | Gillette | 38 | Campbell County |
| Frannie, Town Of | WY5600210 | CWS | Frannie | 160 | Big Horn County, Park County |
| Freedom Hills Subdivision | WY5600789 | CWS | Gillette | 400 | Campbell County |
| Freedom W&S District | WY5600158 | CWS | Thayne | 300 | Lincoln County |
| Garcia Mobile Home Park | WY5601746 | CWS | American Fork | 148 | Sweetwater County |
| Gardens North Homeowners Association | WY5600774 | CWS | Dubois | 300 | Fremont County |
| Georgia-Pacific Gypsum Llc | WY5600611 | NTNCWS | Lovell | 90 | Big Horn County |
| Gilchrist Elementary | WY5601025 | NTNCWS | Cheyenne, | 160 | Laramie County |
| Glendo, Town Of | WY5600231 | CWS | Glendo | 289 | Platte County |
| Glenrock, Town Of | WY5600199 | CWS | Glenrock | 2,466 | Converse County |
| Grand Targhee Resort | WY5601201 | NTNCWS | Alta | 2,500 | Teton County |
| Granger, Town Of | WY5600020 | CWS | Granger | 139 | Sweetwater County |
| Granite Canyon Quarry | WY5601146 | NTNCWS | Lakewood | 54 | Laramie County |
| Greater Smoot W&S District | WY5601397 | CWS | Smoot | 720 | Lincoln County |
| Green Acres Mobile Home Park | WY5600238 | CWS | Powell | 375 | Park County |
| Green Valley Estates I&S District | WY5601245 | CWS | Gillette | 140 | Campbell County |
| Green Valley Mhp | WY5600969 | CWS | Farmington Hills | 265 | Natrona County |
| Greybull Heights Water Users | WY5600230 | CWS | Greybull | 84 | Big Horn County |
| Greybull, Town Of | WY5600022 | CWS | Greybull | 2,080 | Big Horn County |
| Gros Ventre North Hoa | WY5601357 | CWS | Wilson | 160 | Teton County |
| Gros Ventre Utility | WY5600027 | CWS | Jackson | 200 | Teton County |
| Grover Water & Sewer District | WY5600160 | CWS | Thayne | 252 | Lincoln County |
| Gtnp--Moose/Beaver Creek | WY5680093 | CWS | Moose | 221 | Teton County |
| Gtnp-Jackson Lake Lodge | WY5680103 | CWS | Moose | 1,830 | Teton County |
| Gtnp-Moran Buffalo Ranger Station | WY5680107 | NTNCWS | Moose | 50 | Teton County |
| Gtnp-Teton Science School | WY5680099 | NTNCWS | Moose | 31 | Teton County |
| Guernsey, Town Of | WY5600023 | CWS | Guernsey | 1,157 | Platte County |
| Hagens Estates | WY5601739 | CWS | Gillette | 29 | Campbell County |
| Hanna, Town Of | WY5600025 | CWS | Hanna | 841 | Carbon County |
| Hartville, Town Of | WY5600186 | CWS | Hartville | 64 | Platte County |
| Heritage Village Subdivision | WY5600249 | CWS | Gillette | 750 | Campbell County |
| Hi-Country Water District | WY5600216 | CWS | Wilson | 85 | Teton County |
| Hidden Hills Mhp | WY5601339 | CWS | Farmington Hills | 324 | Natrona County |
| Hide-A-Way Mobile Village | WY5600263 | CWS | Cheyenne | 107 | Laramie County |
| Highland Ranch Estates | WY5600260 | CWS | Cheyenne | 128 | Laramie County |
| Highview Mfg Mobile Home Community (Mhc) | WY5600120 | CWS | Gillette | 304 | Campbell County |
| Hilcorp Carter Creek Gas Plant | WY5600980 | NTNCWS | Houston | 80 | Uinta County |
| Horizon Mhp | WY5600088 | CWS | Rock Springs | 330 | Sweetwater County |
| Hoy Mobile Home Park | WY5600141 | CWS | Gillette | 100 | Campbell County |
| Hudson, Town Of | WY5600183 | CWS | Hudson | 460 | Fremont County |
| Hulett, Town Of | WY5600026 | CWS | Hulett | 420 | Crook County |
| Hwy 390 Llc | WY5601725 | CWS | Wilson | 50 | Teton County |
| Hyattville S&I District | WY5600209 | CWS | Hyattville | 60 | Big Horn County |
| Indian Paintbrush Water District | WY5600758 | CWS | Wilson | 150 | Teton County |
| J-W Subdivision Association | WY5600877 | CWS | Jackson | 40 | Teton County |
| Jackson Hole Airport | WY5600844 | NTNCWS | Wilson | 1,300 | Teton County |
| Jackson Hole Classical Academy | WY5601735 | NTNCWS | Wilson | 150 | Teton County |
| Jade Mhc | WY5600181 | CWS | Riverton | 200 | Fremont County |
| Jamestown-Rio Vista W&S District | WY5600810 | CWS | Green River | 560 | Sweetwater County |
| Jeffrey City Water & Sewer District | WY5600106 | CWS | Jeffrey City | 40 | Fremont County |
| Jim Bridger Power Plant | WY5600639 | NTNCWS | Point Of Rocks | 450 | Sweetwater County |
| Jonah Energy (Linn) Oc | WY5601595 | NTNCWS | Denver | 130 | Sublette County |
| Jonah Energy Llc Field Office | WY5601668 | NTNCWS | Denver | 92 | Sublette County |
| Jubys Mobile Home Park | WY5601496 | CWS | Cody | 300 | Park County |
| Juniper Park Water Association | WY5601275 | CWS | Pavillion | 42 | Fremont County |
| Kaycee, Town Of | WY5600196 | CWS | Kaycee | 263 | Johnson County |
| Kelly School (Tcsd #1) | WY5600904 | NTNCWS | Jackson | 100 | Teton County |
| Kennington Springs Pipeline | WY5601199 | CWS | Fairview | 45 | Lincoln County |
| Kirby, Town Of | WY5600236 | CWS | Kirby | 70 | Hot Springs County |
| La Barge, Town Of | WY5600222 | CWS | La Barge | 347 | Lincoln County |
| La Grange, Town Of | WY5600788 | CWS | La Grange | 448 | Goshen County |
| Lakeview I&S District | WY5601494 | CWS | Casper | 62 | Natrona County |
| Lakeview Mobile Home Park | WY5601449 | CWS | Gillette | 36 | Campbell County |
| Lance Creek Water District | WY5600109 | CWS | Lance Creek | 55 | Niobrara County |
| Laramie County Archer Complex | WY5601646 | NTNCWS | Cheyenne | 212 | Laramie County |
| Leisure Valley Inc/ Star Valley Rv Park | WY5601471 | CWS | Thayne | 1,897 | Lincoln County |
| Lewis Mobile Home Park | WY5601175 | CWS | Rock Springs | 370 | Sweetwater County |
| Lex Mobile Home Park | WY5601742 | CWS | Casper | 172 | Campbell County |
| Lindley Park, Llc | WY5600820 | CWS | Evanston | 362 | Uinta County |
| Lingle, Town Of | WY5600030 | CWS | Lingle | 486 | Goshen County |
| Little America Hotels & Resorts Cheyenne | WY5600485 | NTNCWS | Cheyenne | 525 | Laramie County |
| Little America Hotels & Resorts, Inc- Wy | WY5600097 | CWS | Little America | 2,004 | Sweetwater County |
| Little Horsethief Canyon Hoa | WY5601730 | CWS | Wilson | 35 | Teton County |
| Little Powder School | WY5601674 | NTNCWS | Gillette | 32 | Campbell County |
| Lone Tree Village Mhp | WY5601343 | CWS | Douglas | 475 | Converse County |
| Lost Cabin Gas Plant (Contango Res, Llc) | WY5601462 | NTNCWS | Lysite | 45 | Fremont County |
| Love`S Travel Center | WY5601504 | NTNCWS | Cheyenne | 1,545 | Laramie County |
| Lucerne Water And Sewer Dist. | WY5600935 | CWS | Thermopolis | 350 | Hot Springs County |
| Lusk, Town Of | WY5600032 | CWS | Lusk | 1,576 | Niobrara County |
| Lyman, Town Of | WY5600033 | CWS | Lyman | 2,203 | Uinta County |
| Manderson, Town Of | WY5600204 | CWS | Basin | 110 | Big Horn County |
| Manville, Town Of | WY5600110 | CWS | Manville | 97 | Niobrara County |
| Marbleton, Town Of | WY5600223 | CWS | Marbleton | 861 | Sublette County |
| Mcdonald'S (Preiss Corporation) | WY5601243 | NTNCWS | Cheyenne | 575 | Laramie County |
| Meadow Springs Imp & Serv | WY5601507 | CWS | Gillette | 45 | Campbell County |
| Meadowlark Academy | WY5601480 | NTNCWS | Cheyenne | 70 | Laramie County |
| Means Improvement & Service District | WY5600760 | CWS | Gillette | 410 | Campbell County |
| Medicine Bow, Town Of | WY5600034 | CWS | Medicine Bow | 189 | Carbon County |
| Medicine Waters Village | WY5601741 | CWS | Rawlins | 200 | Carbon County |
| Meeteetse, Town Of | WY5600035 | CWS | Meeteetse | 327 | Park County |
| Melody Ranch Improvement & Service Dist. | WY5601440 | CWS | Jackson | 900 | Teton County |
| Midwest, Town Of | WY5600201 | CWS | Midwest | 325 | Natrona County |
| Mile-Hi I&S District | WY5601645 | CWS | Casper | 120 | Natrona County |
| Miller Lower Mobile Home Park | WY5600051 | CWS | Cheyenne | 30 | Laramie County |
| Mobile Corrals Mhp | WY5601203 | CWS | Rock Springs | 110 | Sweetwater County |
| Moorcroft, Town Of | WY5600037 | CWS | Moorcroft | 1,009 | Crook County |
| Mountain Cement Company | WY5601327 | NTNCWS | Laramie | 90 | Albany County |
| Mountain View Acres | WY5600182 | CWS | Pavillion | 165 | Fremont County |
| Mountain View Estates (Knecht Invts) | WY5601270 | CWS | Fort Collins | 75 | Laramie County |
| Mountain View, Town Of | WY5600847 | CWS | Mountain View | 1,250 | Uinta County |
| Mountain Village Parks | WY5600221 | CWS | Jamestown | 53 | Sublette County |
| Munger Mountain Elementary School | WY5601714 | NTNCWS | Jackson | 500 | Teton County |
| National Wildlife Art Museum | WY5601325 | NTNCWS | Wilson | 213 | Teton County |
| Natrona County Int'L Airport | WY5600079 | CWS | Casper | 423 | Natrona County |
| Navajo Trans Engr Co., Llc (Antelope) | WY5601374 | NTNCWS | Gillette | 550 | Converse County |
| Navajo Trans Enrg. Co., Llc (Cordero) | WY5600374 | NTNCWS | Gillette | 550 | Campbell County |
| Ne Wy Regional Airport | WY5601023 | NTNCWS | Gillette | 50 | Campbell County |
| Nickelson Farms Water Company | WY5600619 | CWS | Gillette | 400 | Campbell County |
| Nine-Mile Water & Sewer District | WY5601533 | CWS | Laramie | 200 | Albany County |
| Nordic Ranches Water, Llc. | WY5601418 | CWS | Etna | 465 | Lincoln County |
| North Alpine I&S District | WY5601021 | CWS | Alpine | 200 | Lincoln County |
| North Antelope Coal Mine | WY5600874 | NTNCWS | Wright | 170 | Campbell County |
| North Forty Subdivision | WY5601719 | CWS | Thayne | 15 | Lincoln County |
| North Gurley Mobile Home Park | WY5601721 | CWS | Gillette | 128 | Campbell County |
| O Bar B Improvement & Service District | WY5601693 | NTNCWS | Jackson | 100 | Teton County |
| Oakley Water, Llc | WY5601733 | CWS | Kemmerer | 39 | Lincoln County |
| Old West Cabins | WY5601187 | CWS | Wilson | 70 | Teton County |
| Opal, Town Of | WY5600835 | CWS | Opal | 65 | Lincoln County |
| Orchard Valley Water Company | WY5600012 | CWS | Cheyenne | 260 | Laramie County |
| Osage Water District | WY5600038 | CWS | Osage | 200 | Weston County |
| Osmond I&S District | WY5600154 | CWS | Afton | 315 | Lincoln County |
| Overbrook Subdivision | WY5601572 | CWS | Gillette | 66 | Campbell County |
| Owl Creek Water District | WY5601673 | CWS | Thermopolis | 100 | Hot Springs County |
| Pavillion, Town Of | WY5600039 | CWS | Pavillion | 230 | Fremont County |
| People`S Improvement & Service District | WY5600898 | CWS | Gillette | 176 | Campbell County |
| Pep Energy Partners | WY5601685 | NTNCWS | Pinedale | 25 | Sublette County |
| Pine Bluffs, Town Of | WY5600040 | CWS | Fort Collins | 1,186 | Laramie County |
| Pine Haven, Town Of | WY5600191 | CWS | Gillette | 498 | Crook County |
| Pinedale Municipal Ws | WY5600041 | CWS | Pinedale | 2,005 | Sublette County |
| Pineview I&S District | WY5601490 | CWS | Gillette | 75 | Campbell County |
| Pioneer Mobile Home Park | WY5601173 | CWS | Rock Springs | 1,000 | Sweetwater County |
| Pioneer Water & Sewer District | WY5600828 | CWS | Casper | 1,500 | Natrona County |
| Play Park Llc | WY5600127 | CWS | Gillette | 96 | Campbell County |
| Pleasant Valley Water Association | WY5601749 | CWS | Lander | 35 | Fremont County |
| Pleasant View Water Company | WY5600082 | CWS | Casper | 130 | Natrona County |
| Point Of Rocks Mercantile | WY5600093 | CWS | Point Of Rocks | 78 | Sweetwater County |
| Poison Spider I&S District | WY5600073 | CWS | Casper | 200 | Natrona County |
| Potlatch Trailer Court | WY5600171 | CWS | Torrington | 70 | Goshen County |
| Powder River Coal-Caballo Mine | WY5600328 | NTNCWS | Gillette | 200 | Campbell County |
| Powder River Coal-Rawhide Mine | WY5600815 | NTNCWS | Gillette | 235 | Campbell County |
| Power Resources Inc/Smith Ranch | WY5601500 | NTNCWS | Glenrock | 40 | Converse County |
| Prairie Wind Elementary School | WY5601690 | NTNCWS | Cheyenne, | 491 | Laramie County |
| Pub Place | WY5601258 | NTNCWS | Jackson | 497 | Teton County |
| Rafter D Improvement & Service District | WY5601609 | CWS | Gillette | 40 | Campbell County |
| Rafter J Subdivision Hoa | WY5600822 | CWS | Wilson | 1,500 | Teton County |
| Raintree Estates | WY5601100 | CWS | Riverton | 100 | Fremont County |
| Ranchester, Town Of | WY5600044 | CWS | Ranchester | 1,297 | Sheridan County |
| Recluse School #2 | WY5601057 | NTNCWS | Gillette | 31 | Campbell County |
| Red Hills Subdivison | WY5601657 | CWS | Gillette | 62 | Campbell County |
| Red Lane Domestic Water, Inc. | WY5600232 | CWS | Thermopolis | 110 | Hot Springs County |
| Redd Fox Park Hoa | WY5600805 | CWS | Lander | 75 | Fremont County |
| Restway Travel Park | WY5601292 | CWS | Cheyenne | 62 | Laramie County |
| Ridgewater Improvement District | WY5600285 | CWS | Douglas | 218 | Converse County |
| Rivermeadows Water District | WY5600786 | CWS | Jackson | 100 | Teton County |
| Rivers Bend Trailer Court | WY5600212 | CWS | Powell | 96 | Park County |
| Riverside Mobile Home Court | WY5601641 | CWS | Casper | 140 | Natrona County |
| Rochelle Coal Mine | WY5601184 | NTNCWS | Wright | 306 | Campbell County |
| Rock River, Town Of | WY5600048 | CWS | Rock River | 211 | Albany County |
| Rock Springs/Green River Jpb | WY5600050 | CWS | Green River | 25 | Sweetwater County |
| Rodeo Flats | WY5601626 | CWS | Gillette | 72 | Campbell County |
| Rolling Hills, Town Of | WY5600782 | CWS | Rolling Hills | 450 | Converse County |
| Rozet Ranchettes I&S District | WY5601620 | CWS | Gillette | 85 | Campbell County |
| Saddle Butte Water System | WY5601401 | CWS | Jackson | 75 | Teton County |
| Salt Creek Water District | WY5600133 | CWS | Newcastle | 600 | Weston County |
| Sandy Lake Estates I&S District | WY5601581 | CWS | Casper | 450 | Natrona County |
| Sapp Brothers Truck Stop | WY5601034 | NTNCWS | Cheyenne | 400 | Laramie County |
| Saratoga, Town Of | WY5600061 | CWS | Saratoga | 1,720 | Carbon County |
| Scharen Subdivision | WY5601666 | CWS | Greybull | 50 | Big Horn County |
| School Creek Mine | WY5601467 | NTNCWS | Gillette | 75 | Campbell County |
| Second Fike Subdivision | WY5600195 | CWS | Pavillion | 34 | Fremont County |
| Section 4 Water System Incorporated | WY5601519 | CWS | Gillette | 120 | Campbell County |
| Seven Mile Water & Sewer District | WY5601004 | CWS | Laramie | 130 | Albany County |
| Shell Town Water Improvement District | WY5600205 | CWS | Shell | 120 | Big Horn County |
| Shirley Basin | WY5601751 | NTNCWS | Casper | 50 | Carbon County |
| Shoshone Municipal Pipeline | WY5601198 | CWS | Cowley | 25 | Park County |
| Shoshoni, Town Of | WY5600053 | CWS | Shoshoni | 515 | Fremont County |
| Sierra Madre Jpb | WY5601332 | CWS | Encampment | 130 | Carbon County |
| Simplot Phosphates, Llc | WY5601368 | NTNCWS | Rock Springs | 800 | Sweetwater County |
| Sinclair, Town Of | WY5600054 | CWS | Sinclair | 433 | Carbon County |
| Sisecam Wyoming Llc | WY5600634 | NTNCWS | Green River | 450 | Sweetwater County |
| Skyline Ranch I&S District | WY5600217 | CWS | Wilson | 260 | Teton County |
| Skyline Village Mobile Home Pk | WY5601176 | CWS | Littleton | 700 | Sweetwater County |
| Sleepy Hollow Subdivision | WY5600764 | CWS | Gillette | 2,400 | Campbell County |
| Snake River Mobile Home Park | WY5600214 | CWS | Dallas | 100 | Teton County |
| Snake River Sporting Club | WY5601699 | CWS | Wilson | 332 | Teton County |
| Snow King Condominiums | WY5601588 | NTNCWS | Jackson | 490 | Teton County |
| South Big Horn County Jpb | WY5601454 | CWS | Worland | 900 | Big Horn County |
| South End Water Users S&I District | WY5600970 | CWS | Cowley | 150 | Big Horn County |
| South Laramie W&S District | WY5601393 | CWS | Laramie | 490 | Albany County |
| South Park Village Subdivision | WY5600836 | CWS | Wilson | 65 | Teton County |
| South Riverside Acres Wtr Impr Dist | WY5601072 | CWS | Evansville | 125 | Natrona County |
| South Thermopolis W&S District | WY5601083 | CWS | Thermopolis | 450 | Hot Springs County |
| South Torrington Water District | WY5600168 | CWS | Torrington | 450 | Goshen County |
| Southfork Estates | WY5600832 | CWS | Gillette | 144 | Campbell County |
| Southside Well I&S District | WY5600122 | CWS | Gillette | 30 | Campbell County |
| Spring Creek Improvement District | WY5600811 | CWS | Jackson | 400 | Teton County |
| Squaw Creek Water District | WY5600737 | CWS | Wilson | 160 | Teton County |
| Star Valley Ranch, Town Of | WY5600287 | CWS | Star Valley Rancy | 2,894 | Lincoln County |
| Star Valley Trailer Court | WY5601017 | CWS | Thayne | 72 | Lincoln County |
| Star View Estates | WY5600893 | CWS | Auburn | 84 | Lincoln County |
| Stone Creek Hoa | WY5601586 | CWS | Torrington | 100 | Goshen County |
| Stone Gate Estates | WY5601329 | CWS | Gillette | 198 | Campbell County |
| Story Elementary School | WY5600578 | NTNCWS | Sheridan | 31 | Sheridan County |
| Stroup Trailer Court | WY5600145 | CWS | Gillette | 74 | Campbell County |
| Sundance Meadows Spid | WY5601639 | CWS | Douglas | 50 | Converse County |
| Sundance, City Of | WY5600055 | CWS | Sundance | 1,279 | Crook County |
| Sunny Meadows Village | WY5601289 | CWS | Laramie | 485 | Albany County |
| Sunridge Estates | WY5601225 | CWS | Riverton | 220 | Fremont County |
| Sunset Ranch Water District | WY5601633 | CWS | Newcastle | 70 | Weston County |
| Super Pumper/Sinclair #5 | WY5600298 | NTNCWS | Idaho Falls | 1,022 | Laramie County |
| Superior, Town Of | WY5600092 | CWS | Superior | 336 | Sweetwater County |
| Sweetwater County Airport | WY5600749 | NTNCWS | Rock Springs | 189 | Sweetwater County |
| Targhee Towne Water District | WY5600787 | CWS | Targhee Towne | 120 | Teton County |
| Tata Chemicals Soda Ash Partners, Llc | WY5600636 | NTNCWS | Green River | 701 | Sweetwater County |
| Ten Mile Water And Sewer District | WY5601369 | CWS | Rock Springs | 305 | Sweetwater County |
| Ten Sleep, Town Of | WY5600203 | CWS | Ten Sleep | 400 | Washakie County |
| Terrace I Mhc | WY5601231 | CWS | Farmington Hills | 336 | Natrona County |
| Terrace Ii Mhc | WY5601622 | CWS | Farmington Hills | 320 | Natrona County |
| Teton Science School-Jackson Campus | WY5601736 | NTNCWS | Jackson | 420 | Teton County |
| Teton Science School-Wilson Campus | WY5601557 | CWS | Jackson | 31 | Teton County |
| Teton Shadows Hoa | WY5600724 | CWS | Wilson | 100 | Teton County |
| Teton Village Water & Sewer District | WY5600218 | CWS | Teton Village | 906 | Teton County |
| Thayne, Town Of | WY5600159 | CWS | Thayne | 366 | Lincoln County |
| The Maschhoffs, Llc (Champ) | WY5601708 | NTNCWS | Shelby | 25 | Laramie County |
| Thermopolis, Town Of | WY5600056 | CWS | Thermopolis | 2,775 | Hot Springs County |
| Thirty-Three Mile Road I&S District | WY5601579 | CWS | Mills | 100 | Natrona County |
| Togwotee Mountain Lodge | WY5600501 | NTNCWS | Moran | 268 | Teton County |
| Town Of Alpine - Mega Well | WY5601748 | CWS | Alpine | 130 | Lincoln County |
| Trail Ridge Water System | WY5601576 | CWS | Thayne | 100 | Lincoln County |
| Travel Centers Of America | WY5600807 | NTNCWS | Westlake | 1,525 | Laramie County |
| Travel Centers Of America-Ft. Bridger | WY5600793 | NTNCWS | Evanston | 570 | Uinta County |
| Travelodge By Wyndham Bill, Wy | WY5601610 | NTNCWS | Lewisville | 61 | Converse County |
| Turnerville Water And Sewer District | WY5601115 | CWS | Thayne | 90 | Lincoln County |
| Upton, Town Of | WY5600140 | CWS | Upton | 1,100 | Weston County |
| Ur-Energy Usa, Lost Creek Isr | WY5601664 | NTNCWS | Casper | 60 | Sweetwater County |
| Valley View Mutual Water Company | WY5601499 | CWS | Wilson | 100 | Teton County |
| Veterans Administration Medical Center | WY5680001 | CWS | Sheridan | 802 | Sheridan County |
| Vista West Improvement & Serv District | WY5600246 | CWS | Gillette | 120 | Crook County |
| Vista West Water Company | WY5600069 | CWS | Casper | 1,600 | Natrona County |
| W Bar K Mobile Home Park | WY5601607 | CWS | Littleton | 110 | Sweetwater County |
| Wamsutter, Town Of | WY5600105 | CWS | Wamsutter | 500 | Sweetwater County |
| Ward Creek Landowners Association | WY5600850 | CWS | Gillette | 77 | Campbell County |
| Warm Springs Water District | WY5600861 | CWS | Dubois | 68 | Fremont County |
| Washakie Rural Water System | WY5601523 | CWS | Worland | 990 | Washakie County |
| Water Unlimited, Incorporated | WY5600132 | CWS | Newcastle | 144 | Weston County |
| We Soda Alkali, Llc | WY5600728 | NTNCWS | Green River | 950 | Sweetwater County |
| We Soda Alkali, Lp-Granger Facility | WY5600647 | NTNCWS | Green River | 95 | Sweetwater County |
| West End Water District | WY5601032 | CWS | Newcastle | 225 | Weston County |
| West Winds | WY5601619 | CWS | Cheyenne | 663 | Laramie County |
| Western Fuels-Wyoming Inc. | WY5601214 | NTNCWS | Gillette | 64 | Campbell County |
| Western Hills Mhp | WY5601085 | CWS | Littleton | 450 | Sweetwater County |
| Westview Mhc | WY5601593 | CWS | Gillette | 416 | Campbell County |
| Westview Village | WY5600864 | CWS | Thayne | 83 | Lincoln County |
| White Mountain Mobile Home Park | WY5601206 | CWS | Rock Springs | 270 | Sweetwater County |
| White Mountain W&S District | WY5601391 | CWS | Rock Springs | 3,000 | Sweetwater County |
| Williams Field Services-Opal | WY5600603 | NTNCWS | Opal | 41 | Lincoln County |
| Wilson Park Subdivision | WY5601624 | CWS | Wilson | 75 | Teton County |
| Winchester Hills | WY5600779 | CWS | Cheyenne | 1,078 | Laramie County |
| Wrangler Estates | WY5601474 | CWS | Gillette | 250 | Campbell County |
| Wright Water & Sewer District | WY5600136 | CWS | Wright | 3,207 | Campbell County |
| Wyodak Mine | WY5600798 | NTNCWS | Gillette | 60 | Campbell County |
| Wyoming Boys School | WY5601035 | NTNCWS | Worland | 131 | Washakie County |
| Y-O Investments, Inc. | WY5600777 | CWS | Jackson | 173 | Platte County |
| Ynp - Lake Village | WY5680079 | CWS | Yellowstone | 5,925 | Park County, Teton County |
| Ynp-Mammoth Hot Springs | WY5680092 | CWS | Yellowstone | 2,600 | Park County |
| Yoder, Town Of | WY5600169 | CWS | Yoder | 131 | Goshen County |