South Dakota
Pennington County drinking water quality
158 active public water systems serve 141,203 people in Pennington County. 106 are compliant, 52 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 0 carry a health flag.
Active systems
158
67 community systems
People served
141K
by public water systems
Systems with violations
52
33% of active systems, past 3 years
Serious violators
1
0 systems carry a health flag
Needs attention
Darlington Estates
SD4600403 · Rapid City · Community water system · Serves 25
2 rules violated in the past three years
Community water systems
67 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Rapid City Rapid City |
72,009 | 0 | 0 | |
|
Box Elder Box Elder |
14,000 | 1 | 0 | |
|
Rapid Valley Sanitary District Rapid City |
11,408 | 0 | 0 | |
|
Ellsworth Afb Ellsworth Afb |
9,100 | 0 | 0 | |
|
Chapel Lane Water Company Rapid City |
1,200 | 0 | 0 | |
|
Colonial Pine Hills Sanitary Distric Rapid City |
1,200 | 0 | 0 | |
|
Wr/lj Creighton Project Murdo, Philip |
1,170 | 0 | 0 | |
|
Northdale Sanitary District Black Hawk, Piedmont |
1,075 | 1 | 0 | |
|
Hill City Hill City |
872 | 0 | 0 | |
|
Wall Wall |
699 | 0 | 0 | |
|
New Underwood New Underwood |
679 | 0 | 0 | |
|
Hisega Meadows Water INC Rapid City |
493 | 0 | 0 | |
|
Hart Ranch Rapid City |
468 | 0 | 0 | |
|
Pine Grove Rapid City |
425 | 0 | 0 | |
|
South Canyon Country Estates Rapid City |
420 | 0 | 0 | |
|
The Ranch at Black Gap Rapid City |
375 | 0 | 0 | |
|
Prairie Acres LLC Garden City, Rapid City, Tualatin |
350 | 0 | 0 | |
|
Keystone Keystone |
349 | 0 | 0 | |
|
Valley Heights Estates INC Sturgis, Westminster |
320 | 1 | 0 | |
|
Prairie Acres North Garden City, Rapid City, Tualatin |
288 | 0 | 0 | |
|
Carriage Hills Rapid City |
267 | 0 | 0 | |
|
Happy Holiday RV Resort Mercer Island, Rapid City |
264 | 0 | 0 | |
|
Sunset Ranch Piedmont, Rapid City |
263 | 0 | 0 | |
|
Sunnyside Mobile Home Park II Black Hawk, Piedmont |
235 | 1 | 0 | |
|
Oaks Water Users Association New Underwood |
180 | 0 | 0 | |
|
Pine Cliff Estates Black Hawk, Rapid City |
180 | 0 | 0 | |
|
Prairie Acres South Garden City, Rapid City, Tualatin |
170 | 0 | 0 | |
|
Rapid City Mobile Home Park Black Hawk, Cedaredge, Rapid City |
170 | 0 | 0 | |
|
Strato Rim Estates Water Company Rapid City |
170 | 0 | 0 | |
|
Rushmore Ranch Estates Black Hawk, Hot Springs |
168 | 0 | 0 | |
|
Canyon Springs Water and Sewer Distr Black Hawk, Rapid City |
163 | 0 | 0 | |
|
Westberry Trails Water Users Assoc Piedmont, Rapid City |
155 | 0 | 0 | |
|
Ponderosa Mobile Home Ranch Rapid City |
150 | 0 | 0 | |
|
B & J Mobile Home Park Rapid City |
135 | 0 | 0 | |
|
Country Road Estates Black Hawk, Spearfish |
112 | 0 | 0 | |
|
Prairie Haven Subdivision Black Hawk, Rapid City |
105 | 1 | 0 | |
|
Ponderosa Ridge Rapid City |
98 | 1 | 0 | |
|
Spring Canyon Water Company Piedmont, Rapid City |
92 | 0 | 0 | |
|
Sheridan Lake Highlands, Inc. Piedmont, Rapid City |
85 | 0 | 0 | |
|
Wasta Wall, Wasta |
84 | 1 | 0 | |
|
Edelweiss Mountain Improvement Assoc Black Hawk, Rapid City |
70 | 0 | 0 | |
|
Thrall Mtn. Property Owners Associat Black Hawk, Rapid City |
70 | 0 | 0 | |
|
Siphon Hill Water Association Rapid City |
68 | 0 | 0 | |
|
Copper Oaks I New Underwood, Rapid City |
64 | 2 | 0 | |
|
Whispering Willows Billings, Black Hawk, Rapid City |
64 | 0 | 0 | |
|
High Meadows Ranchettes Black Hawk, Rapid City |
60 | 0 | 0 | |
|
Owanka Rural Water System Black Hawk, Owanka |
52 | 0 | 0 | |
|
Lakeside Water Users District Owanka |
51 | 0 | 0 | |
|
Ponderosa Park Rapid City |
50 | 0 | 0 | |
|
Whispering Pines Water Association Rapid City |
48 | 0 | 0 |
Non-community systems (91: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Nps-Mount Rushmore National Memorial Keystone |
4,100 | 0 | 0 | |
|
Reptile Gardens INC Rapid City |
1,169 | 0 | 0 | |
|
Bear Country USA Black Hawk, Rapid City |
1,021 | 0 | 0 | |
|
Country Store at Three Forks Black Hawk, Hill City, Rapid City |
1,000 | 0 | 0 | |
|
Addie Camp Water and Septic Piedmont |
900 | 0 | 0 | |
|
Palmer Gulch Lodge/mt Rushmore KOA Black Hawk, Hill City |
850 | 0 | 0 | |
|
Powder House Lodge Keystone, Rapid City |
700 | 0 | 0 | |
|
Cosmos Mystery Area Columbus, Rapid City |
600 | 0 | 0 | |
|
Usfs-Bhnf Pactola Visitor Center Custer, Spearfish |
535 | 0 | 0 | |
|
Dinosaur Museum Rapid City |
500 | 2 | 2 | |
|
Pactola Pines Store Custer, Rapid City |
500 | 1 | 0 | |
|
Rapid City South RV Park Black Hawk, Rapid City |
440 | 0 | 0 | |
|
Rafter-J Bar Ranch Hill City |
374 | 0 | 0 | |
|
Rush Mountain Adventure Park Keystone |
300 | 0 | 0 | |
|
Rushmore Mountain Coaster Keystone |
300 | 0 | 0 | |
|
The Gaslight Rapid City, Rockerville |
300 | 0 | 0 | |
|
Medicine Mountain Scout Camp Rapid City |
250 | 0 | 0 | |
|
YMCA of the Black Hills Rapid City |
250 | 1 | 1 | |
|
Rapid City RV Park and CG Rapid City |
236 | 0 | 0 | |
|
Creekside LLC Hill City |
235 | 2 | 0 | |
|
Mountain Meadow Resort Hill City |
223 | 0 | 0 | |
|
Blue Wing Recreation Area Hill City, Rapid City |
200 | 0 | 0 | |
|
Chapel in the Hills Rapid City |
200 | 1 | 1 | |
|
Rushmore Tramway Adventures Keystone |
200 | 1 | 1 | |
|
Htr Black Hills Resorts Rapid City |
180 | 1 | 1 | |
|
Usfs-Bhnf Pactola Campground Black Hawk, Custer, Overland Park |
166 | 0 | 0 | |
|
Black Hawk Creek RV Park Black Hawk, Rapid City |
158 | 0 | 0 | |
|
KOA Hill City/needles Highway Black Hawk, Custer |
146 | 1 | 1 | |
|
Usfs-Bhnf Woodsy/smokey CG Black Hawk, Custer, Overland Park |
145 | 0 | 0 | |
|
Pine Haven Venue and Lodging Black Hawk, Rapid City, Wall |
128 | 0 | 0 | |
|
Larsson's Crooked Creek Cg-North Wel Black Hawk, Hill City |
124 | 1 | 1 | |
|
Three Forks Campground and RV Park Hill City |
122 | 2 | 2 | |
|
Ray Smith Hoa-Rs East Well Black Hawk, Hill City |
115 | 0 | 0 | |
|
Rushmore Under Canvas Black Hawk, Bozeman, Keystone |
113 | 0 | 0 | |
|
Black Hills Children's Home Rapid City, Sioux Falls |
105 | 0 | 0 | |
|
Athletic Club of the Black Hills Rapid City |
100 | 1 | 1 | |
|
Camp Judson Keystone, Sioux Falls |
100 | 2 | 1 | |
|
Gcc Dacotah East/west/north Rapid City |
100 | 0 | 0 | |
|
Kemp's Kamp East Keystone |
100 | 0 | 0 | |
|
Usfs-Bhnf Dutchman Campground Black Hawk, Custer, Overland Park |
99 | 0 | 0 | |
|
Horse Creek Resort-Lower Wells Rapid City |
90 | 0 | 0 | |
|
Rushmore Candy Company Rapid City |
90 | 3 | 2 | |
|
Placerville Camp Rapid City |
84 | 1 | 1 | |
|
Sobos RV Park Scenic |
83 | 1 | 0 | |
|
Storm Mountain Center Mitchell, Rapid City |
80 | 1 | 1 | |
|
Usfs-Bhnf Horsethief Lake CG Black Hawk, Custer, Overland Park |
79 | 0 | 0 | |
|
Coca Cola Bottling CO Rapid City |
75 | 0 | 0 | |
|
Prairie Dog Taproom Hill City |
75 | 3 | 1 | |
|
Spring Creek Inn Hill City |
72 | 2 | 0 | |
|
Kemp's Kamp West Keystone |
68 | 0 | 0 | |
|
Lake Park Campground Rapid City |
65 | 0 | 0 | |
|
Cedar Canyon Wesleyan Camp Rapid City |
62 | 1 | 0 | |
|
Canyon Lake Resort Rapid City |
60 | 2 | 0 | |
|
NO Bad Days Campground Hill City |
60 | 2 | 0 | |
|
High Country-Ranch West Well Black Hawk, Hill City |
58 | 1 | 0 | |
|
Whispering Pines Campground Rapid City |
57 | 0 | 0 | |
|
Black Hills Cabins and Motel @ Quail Hill City |
56 | 1 | 1 | |
|
Usfs-Bhnf Chipper/thumper CG Black Hawk, Custer, Overland Park |
56 | 0 | 0 | |
|
Happy Trails Homeowners Black Hawk, Rapid City |
54 | 1 | 0 | |
|
Hillside Country Cabins Rapid City |
54 | 1 | 1 | |
|
Larsson's Crooked Creek Cg-New Black Hawk, Hill City |
54 | 1 | 0 | |
|
Larsson's Crooked Creek Cg-South Wel Black Hawk, Hill City |
52 | 1 | 1 | |
|
Rockerville Gold Nugget Lodge Rapid City |
52 | 0 | 0 | |
|
Silver Dollar Saloon Hill City |
50 | 2 | 1 | |
|
Firehouse Campground Hill City, Rapid City |
45 | 0 | 0 | |
|
Rockerville Motel and Cabins Rapid City |
45 | 0 | 0 | |
|
Sawtooth Campground and Cabins Hill City |
45 | 1 | 0 | |
|
Usfs-Bhnf Rocky Campground Black Hawk, Custer, Overland Park |
41 | 0 | 0 | |
|
American Pines Cabins Keystone |
40 | 3 | 0 | |
|
Usfs-Bhnf Oreville Campground Black Hawk, Custer, Overland Park |
40 | 0 | 0 | |
|
Black Elk Resort Rapid City |
38 | 0 | 0 | |
|
Hill City Visitor Center Hill City |
38 | 0 | 0 | |
|
Holy Smoke Cabins Keystone |
37 | 0 | 0 | |
|
Gcc Dacotah-North Quarry Well Rapid City |
35 | 0 | 0 | |
|
Horse Creek Resort-Log Cabin Well Rapid City |
35 | 0 | 0 | |
|
Rimrock Tavern Lyndon Bolt Boxelder |
35 | 3 | 1 | |
|
Shipwrecks Bar and Grill Rapid City |
35 | 2 | 2 | |
|
Mountain View Lodge Hill City |
34 | 2 | 1 | |
|
Robin's Roost Cabins Hill City |
34 | 2 | 1 | |
|
Kemp's Kamp Upper Keystone |
30 | 0 | 0 | |
|
Freedom Ridge Cabins Hill City |
29 | 0 | 0 | |
|
Silver Mountain Cabins Rapid City |
29 | 0 | 0 | |
|
Harney Camp Cabins Custer |
25 | 2 | 1 | |
|
Kemp's Kamp Middle Keystone |
25 | 0 | 0 | |
|
Moonshine Gulch Saloon Hill City |
25 | 1 | 0 | |
|
Pactola Water Association Black Hawk, Hill City |
25 | 0 | 0 | |
|
Pete Lein & Sons Shooting Range Piedmont |
25 | 0 | 0 | |
|
Rockerville Pud Piedmont, Rapid City |
25 | 0 | 0 | |
|
Rustic Ridge Guest Cabins Keystone |
25 | 0 | 0 | |
|
Salvation Army Camp Rapid City |
25 | 0 | 0 | |
|
Timber Haven Cabins Keystone |
25 | 1 | 0 |
Inactive systems (122, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.