| TUD - UPPER BASIN WATER SYSTEM | 13,280 | 2 | Clean |
| TUD - SONORA/JAMESTOWN WATER SYSTEM | 11,054 | 14 | Detected |
| TUD - COLUMBIA WATER SYSTEM | 5,463 | 2 | Clean |
| PEPPERY BAR AND GRILL, THE | 4,500 | 4 | — |
| CDCR - SIERRA CONSERVATION CENTER | 3,571 | 30 | — |
| GROVELAND COMMUNITY SERV DIST | 3,400 | 18 | Detected |
| LAKE DON PEDRO CSD | 3,240 | 58 | — |
| YOSEMITE NPS-TUOLUMNE MEADOWS | 2,500 | 5 | — |
| TWAIN HARTE COMMUNITY SERVICES DISTRICT | 2,378 | 5 | — |
| MI WUK VILLAGE MUT WTR CO | 2,163 | 11 | — |
| COLD SPRINGS WATER CO | 1,771 | 3 | — |
| TUD - PONDEROSA | 1,767 | 23 | — |
| TUD - TUOLUMNE WATER SYSTEM | 1,761 | 3 | — |
| PINECREST PERMITTEES ASSN | 1,298 | 10 | — |
| DEL ORO WATER COMPANY - STRAWBERRY DIV. | 1,295 | 50 | — |
| PHOENIX LAKE ESTATES CC MWC | 1,168 | 47 | — |
| SONORA WATER RESOURCES, INC | 1,154 | 5 | — |
| SONORA MEADOWS MUTUAL WTR CO | 1,123 | 11 | — |
| DON PEDRO REC AG:FLEM.MEADOWS | 1,041 | 28 | — |
| USBR-TUTTLETOWN REC AREA | 1,000 | 6 | — |
| TUD-APPLE VALLEY ESTATES | 826 | 4 | — |
| USFS CLARK FORK CAMPD | 612 | 1 | — |
| JENNESS PARK CHRISTIAN CAMP | 507 | 8 | — |
| CAMP TAWONGA | 505 | 1 | — |
| CAMP MATHER | 500 | 8 | — |
| BELLEVIEW OAKS MUTUAL WATER CO | 468 | 6 | — |
| MI WUK HEIGHTS MWC | 445 | 15 | — |
| SLIDE INN SNOWBOWL WATER CO | 417 | 10 | — |
| YOSEMITE LAKES CAMPGROUND | 413 | 36 | — |
| SIERRA PARK WATER COMPANY INC. | 400 | 16 | — |
| BERKELEY TUOLUMNE CAMP | 380 | 30 | — |
| USFS BAKER/DEADMAN CGD | 366 | 2 | — |
| SIERRA VILLAGE MUTUAL WATER CO | 361 | 12 | — |
| USFS FRASER FLAT CAMPGD | 348 | 10 | — |
| LEISURE PINES MUTUAL WATER CO | 340 | 10 | — |
| DODGE RIDGE SKI RESORT | 328 | 7 | — |
| CASCADE ESTATES | 316 | 24 | — |
| HEAVENLY HILLS CHRISTIAN CAMP | 304 | 10 | — |
| USFS SOURGRASS CAMPGD | 300 | 4 | — |
| YOSEMITE NPS-WHITE WOLF | 300 | 0 | — |
| DON PEDRO REC AG:BLUE OAKS | 296 | 2 | — |
| SIERRA OUTDOOR SCHOOL | 289 | 30 | — |
| BLUEBELL VALLEY MWC | 282 | 20 | — |
| PEPPERMINT CREEK MHP | 280 | 27 | — |
| RAWHIDE MUTUAL WATER COMPANY | 269 | 11 | — |
| CHRISTIAN BERETS CONF. CENTER | 268 | 6 | — |
| SONORA ESTATES MOBILE HOME PARK | 235 | 7 | — |
| FOOTHILL HORIZONS | 230 | 24 | — |
| SAN JOSE FAMILY CAMP | 230 | 12 | — |
| UNDER CANVAS-YOSEMITE | 226 | 0 | — |