We found 91 public water systems that could serve the same population as Trail West Sanitary District (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Black Hawk City Of | Black Hawk | 15,167 | 57 | 37 |
| Black Hawk Water User District | Black Hawk | 3,750 | 0 | 53 |
| Chapel Lane Water Company | Piedmont, Rapid City | 1,200 | 0 | 4 |
| Northdale Sanitary District | Black Hawk, Piedmont | 1,075 | 0 | 4 |
| Bear Country Usa | Black Hawk, Rapid City | 1,021 | 0 | 79 |
| Palmer Gulch Lodge/mt Rushmore Koa | Black Hawk, Hill City | 850 | 0 | 4 |
| Wonderland Homes | Piedmont | 750 | 0 | 12 |
| Flying J Travel Plaza | Black Hawk, Rapid City | 560 | 0 | 51 |
| Blucksberg Mtn Water Association | Piedmont, Sturgis | 528 | 0 | 19 |
| Piedmont | Piedmont | 512 | 0 | 2 |
| Terry Trojan Water District | Black Hawk, Deadwood, Lead | 400 | 0 | 147 |
| Sun Valley Development | Piedmont, Rapid City | 385 | 0 | 1 |
| Pine Hills Park | Black Hawk, Whitewood | 300 | 0 | 90 |
| Powder House Lodge | Keystone, Piedmont | 300 | 0 | 5 |
| Stagebarn Sanitary District | Black Hawk, Piedmont, Rapid City | 293 | 0 | 24 |
| Heartland Campground | Black Hawk, Hermosa | 270 | 0 | 11 |
| Carriage Hills | Piedmont, Rapid City | 267 | 0 | 5 |
| Trail West Sanitary District | Black Hawk, Piedmont | 260 | 0 | 0 |
| Rainbow Water Company | Piedmont | 258 | 0 | 0 |
| Woodland Hills | Black Hawk | 255 | 0 | 27 |
| Valley View Water Company | Black Hawk, Rapid City | 248 | 0 | 27 |
| Plainsview Mobile Manor | Box Elder, Orangevale, Piedmont | 210 | 0 | 119 |
| Boulder Park Water Users Association | Piedmont, Sturgis | 200 | 0 | 35 |
| Medicine Mountain Scout Camp | Black Hawk, Rapid City | 200 | 0 | 13 |
| Rendezvous Ranch | Black Hawk | 195 | 0 | 51 |
| Oaks Water Users Association | Piedmont, Rapid City | 180 | 0 | 65 |
| Edelweiss Mountain Improvement Assoc | Black Hawk, Rapid City | 172 | 0 | 195 |
| Pine Cliff Estates | Black Hawk, Rapid City | 170 | 0 | 51 |
| Cimarron Park | Black Hawk, Cedaredge | 160 | 0 | 123 |
| Westberry Trails Water Users Assoc | Piedmont, Rapid City | 152 | 0 | 75 |
| Steel Wheel Campground And Convenien | Black Hawk, Deadwood | 150 | 0 | 0 |
| Elk Creek Steakhouse | Piedmont | 150 | 0 | 14 |
| Sunset Ranch | Piedmont, Rapid City | 150 | 0 | 23 |
| Black Hills Chairlift | Black Hawk, Lead | 150 | 0 | 6 |
| Bj's Hermosa | Black Hawk | 150 | 0 | 9 |
| Viewfield Rural Water System | Black Hawk, New Underwood | 150 | 0 | 16 |
| Spring Creek Acres | Black Hawk, Hot Springs | 145 | 0 | 16 |
| High Meadows Water Company | Black Hawk | 140 | 0 | 11 |
| Golden Valley Water Company | Black Hawk, Rapid City | 138 | 0 | 13 |
| B & J Mobile Home Park | Piedmont | 135 | 0 | 2 |
| Midland Heights | Black Hawk, Piedmont | 130 | 0 | 11 |
| Rushmore Ranch Estates | Black Hawk | 128 | 0 | 31 |
| Pleasant Valley Homeowners Associati | Piedmont, Strugis, Sturgis | 122 | 0 | 0 |
| Rolling Dice Subdivision | Piedmont | 120 | 0 | 0 |
| East Ridge Acres | Black Hawk, Piedmont | 115 | 0 | 0 |
| D&j Mobile Home Park | Black Hawk, Spearfish | 112 | 0 | 0 |
| Elk Creek Village | Piedmont | 110 | 0 | 0 |
| Dry Creek Estates | Black Hawk | 105 | 0 | 0 |
| Peaceful Pines Ii | Black Hawk | 102 | 0 | 0 |
| Golden Meadows | Black Hawk | 96 | 0 | 0 |
| Black Hills Children's Home | Piedmont, Rapid City, Sioux Falls | 95 | 0 | 0 |
| Heartland Country Ranchettes | Black Hawk, Hermosa | 95 | 0 | 0 |
| Elk Creek Resort | Piedmont | 90 | 0 | 0 |
| Fish-n-fry Campground | Black Hawk, Deadwood | 90 | 0 | 0 |
| Whispering Willows | Black Hawk, Piedmont | 90 | 0 | 0 |
| Spring Canyon Water Company | Piedmont, Rapid City | 89 | 0 | 0 |
| Creative Kids Too Preschool & Daycar | Piedmont, Rapid City | 87 | 0 | 0 |
| Quaal Water Association | Black Hawk | 83 | 0 | 0 |
| Gas Light | Piedmont, Rockerville | 75 | 0 | 0 |
| Timberwood Park Estates | Piedmont, Rapid City | 75 | 0 | 0 |
| Crooked Oaks Canyon Homeowners | Black Hawk, Piedmont | 75 | 0 | 0 |
| Terra Cotta Estates | Piedmont, Rapid City | 75 | 0 | 0 |
| Thrall Mtn. Property Owners Associat | Black Hawk, Rapid City | 70 | 0 | 0 |
| Oak Mountain Country Estates | Black Hawk, Deadwood | 70 | 0 | 0 |
| Rimrock Highland Estates Comm Assoc | Piedmont, Rapid City | 68 | 0 | 0 |
| Autumn Meadows Sanitary District | Black Hawk, Piedmont | 68 | 0 | 0 |
| Sheridan Lake Highlands | Piedmont, Rapid City | 66 | 0 | 0 |
| Horseshoe Water Company | Piedmont | 65 | 0 | 0 |
| Copper Oaks I | Piedmont, Rapid City | 64 | 0 | 0 |
| Elk Valley Ranchettes | Piedmont, Rapid City | 62 | 0 | 0 |
| High Meadows Ranchettes | Black Hawk, Rapid City | 58 | 0 | 0 |
| Piedmont Preschool & Child Care | Piedmont | 55 | 0 | 0 |
| Cavalry Trails Homeowner Association | Piedmont, Rapid City | 55 | 0 | 0 |
| Owanka Rural Water System | Black Hawk, Owanka | 52 | 0 | 0 |
| Hidden Valley Campground | Black Hawk, Deadwood | 50 | 0 | 0 |
| Canyon Springs Preserve Hoa | Black Hawk, Rapid City | 50 | 0 | 0 |
| Ramada Inn | Black Hawk | 50 | 0 | 0 |
| Golden Hills Homes | Piedmont, Rapid City | 47 | 0 | 0 |
| Three Flags Rv Park | Black Hawk | 45 | 0 | 0 |
| Pine Cone Estates | Piedmont, Sturgis | 42 | 0 | 0 |
| Sacora Mobile Home Park | Piedmont, Sturgis | 42 | 0 | 0 |
| Valhalla Addition | Black Hawk, Sturgis | 38 | 0 | 0 |
| Lofty Pines Ii | Piedmont | 38 | 0 | 0 |
| High Sheridan Ranch | Black Hawk, Rapid City | 33 | 0 | 0 |
| Slash J Saloon | Piedmont | 31 | 0 | 0 |
| The Niche Sanitary District | Black Hawk, Sturgis | 30 | 0 | 0 |
| Norris Peak Water Users Assoc | Black Hawk, Rapid City | 30 | 0 | 0 |
| Cedar Gulch Ii | Piedmont, Rapid City | 27 | 0 | 0 |
| Pactola Water Association | Black Hawk, Rapid City | 25 | 0 | 0 |
| Pineview Water Association | Piedmont, Rapid City | 25 | 0 | 0 |
| Ponderosa Water Company | Piedmont, Rapid City | 25 | 0 | 0 |