| SPEARFISH | 12,193 | 19 | Clean |
| LEAD | 2,982 | 10 | — |
| DEADWOOD | 1,156 | 15 | — |
| WHITEWOOD | 879 | 68 | — |
| GUADALAJARA MEXICAN RESTAURANT | 630 | 129 | — |
| SPEARFISH CANYON RESORT LLC | 492 | 60 | — |
| TERRY TROJAN WATER DISTRICT | 400 | 419 | — |
| MYSTIC HILLS HIDEAWAY NORTH | 369 | 3 | — |
| MOUNTAIN PLAINS 2 HOMEOWNERS ASSOC | 268 | 179 | — |
| SPEARFISH KOA | 256 | 2 | — |
| SAINT ONGE SEWER & WATER CO | 255 | 185 | — |
| WHARF RESOURCES WATER SYSTEM | 250 | 83 | — |
| SUGAR SHACK | 240 | 101 | — |
| POWDER HOUSE PASS | 238 | 2 | — |
| BOXELDER CIVILIAN CONSERVATION CTR | 220 | 25 | — |
| BOULDER PARK WATER USERS ASSOCIATION | 200 | 73 | — |
| RENDEZVOUS RANCH | 195 | 102 | Clean |
| LANTERN ESTATES | 192 | 248 | — |
| WALNUT PARK | 180 | 219 | — |
| APPLE SPRINGS SUBDIVISION | 180 | 6 | — |
| PARADISE WATER COMPANY LLC | 178 | 2 | — |
| STEEL WHEEL CAMPGROUND AND CONVENIEN | 166 | 0 | — |
| SPEARFISH VALLEY MOBILE ESTATES | 163 | 26 | — |
| WHITEWOOD FOREST ACRES | 160 | 6 | — |
| CHEYENNE CROSSING STORE | 150 | 53 | — |
| BLACK HILLS CHAIRLIFT | 150 | 12 | — |
| DEER MOUNTAIN SANITARY DISTRICT | 125 | 263 | — |
| USFS-BHNF ROUBAIX LAKE CG | 124 | 12 | — |
| WILD BILL'S CAMPGROUND | 120 | 29 | — |
| SPEARFISH FOREST PRODUCTS | 120 | 0 | — |
| FISH-N-FRY CAMPGROUND | 113 | 33 | — |
| KEN'S TRAILER COURT | 110 | 67 | — |
| WESTFIELD ADDITION | 104 | 188 | — |
| WESTVIEW HOMEOWNERS ASSOCIATION | 103 | 42 | — |
| D & E WATER COMPANY | 100 | 87 | — |
| BOULDER CANYON COUNTRY CLUB | 100 | 52 | — |
| LEWIE'S BURGERS AND BREWS | 100 | 55 | — |
| SPEARFISH MEADOWS | 87 | 386 | — |
| OAK MOUNTAIN COUNTRY ESTATES | 85 | 323 | — |
| LOURIE LANE HOMEOWNERS ASSOC | 75 | 361 | — |
| CUSTER CROSSING CG AND CABINS | 75 | 18 | — |
| WILD TURKEY ESTATES II | 70 | 0 | — |
| NEMO GUEST RANCH | 65 | 169 | — |
| SHIRT TAIL GULCH DEVELOPMENT | 65 | 622 | — |
| MEADOW CREST SANITARY DISTRICT | 63 | 130 | — |
| MYSTIC HILLS HIDEAWAY SOUTH | 63 | 0 | — |
| TOMAHAWK COUNTRY CLUB-CLUBHOUSE | 60 | 60 | — |
| DEBERG WELL USERS ASSOCIATION | 54 | 52 | — |
| HIDDEN VALLEY CAMPGROUND | 50 | 67 | — |
| SUNRISE HOMEOWNERS ASSOCIATION | 50 | 385 | — |