Water quality for ZIP code 57751
ZIP 57751 covers Keystone in Pennington County, South Dakota, one of 9 ZIP codes in the county. 158 active public water systems serve the county; 52 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Pennington County
66 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Hill City Hill City |
872 | 0 | 6.8 mi | |
| Golden Hills Homes Rapid City |
47 | 0 | 7.1 mi | |
| Rushmore Ranch Estates Black Hawk, Hot Springs |
168 | 0 | 7.2 mi | |
| Pine Grove Rapid City |
425 | 0 | 8.3 mi | |
| Strato Rim Estates Water Company Rapid City |
170 | 0 | 8.6 mi | |
| Sheridan Lake Highlands, Inc. Piedmont, Rapid City |
85 | 0 | 8.7 mi | |
| Oaks Water Users Association New Underwood |
180 | 0 | 9.3 mi | |
| High Sheridan Ranch Black Hawk, Rapid City |
38 | 0 | 9.5 mi | |
| Spring Canyon Water Company Piedmont, Rapid City |
92 | 0 | 9.8 mi | |
| Whispering Pines Water Association Rapid City |
48 | 0 | 10.3 mi | |
| Ponderosa Park Rapid City |
50 | 0 | 10.7 mi | |
| Colonial Pine Hills Sanitary Distric Rapid City |
1,200 | 0 | 11.3 mi | |
| Highland Hills Rapid City |
38 | 1 | 11.3 mi | |
| Edelweiss Mountain Improvement Assoc Black Hawk, Rapid City |
70 | 0 | 11.5 mi | |
| Happy Holiday RV Resort Mercer Island, Rapid City |
264 | 0 | 11.7 mi | |
| Hart Ranch Rapid City |
468 | 0 | 12.6 mi | |
| Hisega Meadows Water INC Rapid City |
493 | 0 | 12.7 mi | |
| Rimrock Ridge Water Association Rapid City |
35 | 0 | 13.0 mi | |
| Siphon Hill Water Association Rapid City |
68 | 0 | 13.4 mi | |
| Carriage Hills Rapid City |
267 | 0 | 13.5 mi | |
| Chapel Lane Water Company Rapid City |
1,200 | 0 | 14.0 mi | |
| Pine Cliff Estates Black Hawk, Rapid City |
180 | 0 | 14.0 mi | |
| Pineview Water Association Rapid City |
25 | 0 | 14.0 mi | |
| Ponderosa Water Company Rapid City |
25 | 0 | 14.1 mi | |
| Thrall Mtn. Property Owners Associat Black Hawk, Rapid City |
70 | 0 | 14.5 mi |
Non-community systems in Pennington County (91: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Nps-Mount Rushmore National Memorial Keystone |
4,100 | 0 | 0 | |
|
American Pines Cabins Keystone |
40 | 3 | 0 | |
|
Rushmore Tramway Adventures Keystone |
200 | 1 | 1 | |
|
Kemp's Kamp East Keystone |
100 | 0 | 0 | |
|
Rushmore Under Canvas Black Hawk, Bozeman, Keystone |
113 | 0 | 0 | |
|
Kemp's Kamp West Keystone |
68 | 0 | 0 | |
|
Kemp's Kamp Upper Keystone |
30 | 0 | 0 | |
|
Kemp's Kamp Middle Keystone |
25 | 0 | 0 | |
|
Camp Judson Keystone, Sioux Falls |
100 | 2 | 1 | |
|
Usfs-Bhnf Horsethief Lake CG Black Hawk, Custer, Overland Park |
79 | 0 | 0 | |
|
Powder House Lodge Keystone, Rapid City |
700 | 0 | 0 | |
|
Holy Smoke Cabins Keystone |
37 | 0 | 0 | |
|
Rustic Ridge Guest Cabins Keystone |
25 | 0 | 0 | |
|
Cosmos Mystery Area Columbus, Rapid City |
600 | 0 | 0 | |
|
Black Hills Children's Home Rapid City, Sioux Falls |
105 | 0 | 0 | |
|
Palmer Gulch Lodge/mt Rushmore KOA Black Hawk, Hill City |
850 | 0 | 0 | |
|
Black Elk Resort Rapid City |
38 | 0 | 0 | |
|
Hillside Country Cabins Rapid City |
54 | 1 | 1 | |
|
Freedom Ridge Cabins Hill City |
29 | 0 | 0 | |
|
Blue Wing Recreation Area Hill City, Rapid City |
200 | 0 | 0 | |
|
Creekside LLC Hill City |
235 | 2 | 0 | |
|
Silver Mountain Cabins Rapid City |
29 | 0 | 0 | |
|
Usfs-Bhnf Chipper/thumper CG Black Hawk, Custer, Overland Park |
56 | 0 | 0 | |
|
Country Store at Three Forks Black Hawk, Hill City, Rapid City |
1,000 | 0 | 0 | |
|
Three Forks Campground and RV Park Hill City |
122 | 2 | 2 | |
|
Sawtooth Campground and Cabins Hill City |
45 | 1 | 0 | |
|
Firehouse Campground Hill City, Rapid City |
45 | 0 | 0 | |
|
Addie Camp Water and Septic Piedmont |
900 | 0 | 0 | |
|
Prairie Dog Taproom Hill City |
75 | 3 | 1 | |
|
Robin's Roost Cabins Hill City |
34 | 2 | 1 | |
|
Rush Mountain Adventure Park Keystone |
300 | 0 | 0 | |
|
Rushmore Mountain Coaster Keystone |
300 | 0 | 0 | |
|
Spring Creek Inn Hill City |
72 | 2 | 0 | |
|
Usfs-Bhnf Woodsy/smokey CG Black Hawk, Custer, Overland Park |
145 | 0 | 0 | |
|
Usfs-Bhnf Rocky Campground Black Hawk, Custer, Overland Park |
41 | 0 | 0 | |
|
Hill City Visitor Center Hill City |
38 | 0 | 0 | |
|
Storm Mountain Center Mitchell, Rapid City |
80 | 1 | 1 | |
|
Mountain View Lodge Hill City |
34 | 2 | 1 | |
|
KOA Hill City/needles Highway Black Hawk, Custer |
146 | 1 | 1 | |
|
The Gaslight Rapid City, Rockerville |
300 | 0 | 0 | |
|
Silver Dollar Saloon Hill City |
50 | 2 | 1 | |
|
Black Hills Cabins and Motel @ Quail Hill City |
56 | 1 | 1 | |
|
Rockerville Motel and Cabins Rapid City |
45 | 0 | 0 | |
|
Rockerville Gold Nugget Lodge Rapid City |
52 | 0 | 0 | |
|
Larsson's Crooked Creek Cg-North Wel Black Hawk, Hill City |
124 | 1 | 1 | |
|
Larsson's Crooked Creek Cg-South Wel Black Hawk, Hill City |
52 | 1 | 1 | |
|
Timber Haven Cabins Keystone |
25 | 1 | 0 | |
|
Larsson's Crooked Creek Cg-New Black Hawk, Hill City |
54 | 1 | 0 | |
|
Rafter-J Bar Ranch Hill City |
374 | 0 | 0 | |
|
Pine Haven Venue and Lodging Black Hawk, Rapid City, Wall |
128 | 0 | 0 |
About this data
Water systems are matched to Pennington County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files or the centre of the first town EPA lists the system as serving, from Census Bureau county subdivision files.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The South Dakota records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.