| MARYSVILLE FLEA MARKET | MARYSVILLE, CA | 500 | 1 | — |
| LAKEVIEW HILLS COMMUNITY ASSOC | FOLSOM, CA | 499 | 5 | — |
| HIDDEN VALLEY COMMUNITY ASSOCIATION | GRANITE BAY, CA | 499 | 4 | — |
| VALLEY VIEW PARK MWC | CRESTLINE, CA | 499 | 17 | — |
| BROADVIEW TERRACE MUTUAL WATER COMPANY | OAKHURST, CA | 498 | 14 | — |
| ROUGH ACRES FOUNDATION | EL CAJON, CA | 497 | 5 | — |
| AIRSTREAMS RENEWABLES | TEHACHAPI, CA | 495 | 22 | — |
| WESTSIDE PARK MUTUAL WATER | PALMDALE, CA | 495 | 8 | — |
| HHW&P-O'SHAUGHNESSY DAM CPD-SFPUC | BURLINGAME, CA | 495 | 13 | — |
| THE LAKES ASSOCIATION | VISALIA, CA | 495 | 16 | — |
| AGUA DULCE WATER SYSTEM | LOS ANGELES, CA | 493 | 14 | — |
| MIRANDA C.S.D. | MIRANDA, CA | 492 | 9 | — |
| SKY FOREST MWC | SKY FOREST, CA | 492 | 13 | — |
| PACIFIC UNION ELEMENTARY SCHOOL | FRESNO, CA | 490 | 11 | — |
| WESTHAVEN C.S.D. | TRINIDAD, CA | 490 | 23 | — |
| RAYMOND VINEYARD & CELLAR | ST HELENA, CA | 490 | 6 | — |
| RANCHERITOS MWC | APPLE VALLEY, CA | 487 | 9 | Detected |
| WALNUT HILLS MUTUAL WATER CO | PASO ROBLES, CA | 486 | 4 | — |
| RIVERGOLD ELEMENTARY SCHOOL | OAKHURST, CA | 485 | 5 | — |
| ANZA BORREGO SP - PALM CANYON | BORREGO SPRINGS, CA | 484 | 21 | — |
| CITY OF TEHAMA | TEHAMA, CA | 483 | 21 | — |
| WILLOW MOBILE HOME PARK | MARTINEZ, CA | 481 | 8 | — |
| SUMMIT WEST MUTUAL WATER CO. | LOS GATOS, CA | 481 | 41 | — |
| ROCKWELL COLLINS INC. (FKA UPCO-UTAS) | FAIRFIELD, CA | 477 | 7 | — |
| LYTLE SPRINGS WC | LYTLE CREEK, CA | 475 | 7 | — |
| LASSEN PINES MUTUAL WATER CO INC | SHINGLETOOWN, CA | 475 | 6 | — |
| BERRYESSA ESTATES (LBRID) | NAPA, CA | 474 | 54 | — |
| ARMSTRONG VALLEY-CAL WATER SERVICE (PUC) | SAN JOSE, CA | 473 | 1 | — |
| THOMAS AQUINAS COLLEGE | SANTA PAULA, CA | 472 | 13 | — |
| FOWLER PACKING COMPANY | FRESNO, CA | 470 | 13 | — |
| MID - MC CLURE POINT REC AREA | SNELLING, CA | 470 | 8 | — |
| CSA 70 W-4 PIONEERTOWN | SAN BERNARDINO, CA | 470 | 186 | — |
| CAMP TAHQUITZ | LONG BEACH, CA | 470 | 6 | — |
| EDWARDS AFB - AIR FORCE RESEARCH LAB | EDWARDS AFB, CA | 469 | 7 | — |
| TEHACHAPI CHURCH OF THE NAZARENE | TEHACHAPI, CA | 469 | 19 | — |
| U.S. COAST GUARD TRAINING CENTER | PETALUMA, CA | 469 | 7 | — |
| GLENWOOD MOBILE ESTATES | LOS ANGELES, CA | 468 | 4 | — |
| VISTA GRANDE WATER SYSTEM | GERBER, CA | 468 | 15 | — |
| BELLEVIEW OAKS MUTUAL WATER CO | SONORA, CA | 468 | 6 | — |
| MUSD - WOODLAND ELEMENTARY SCHOOL | MARIPOSA, CA | 466 | 4 | — |
| CANYON MEADOWS MUTUAL WATER | BODFISH, CA | 465 | 29 | — |
| ARCOHE ELEM SCHOOL - MAIN CAMPUS | HERALD, CA | 465 | 7 | — |
| NEWBERRY MINI MART AND TRUCK STOP | NEWBERRY SPRINGS, CA | 465 | 4 | — |
| DUNLAP K-8 SCHOOL | REEDLEY, CA | 463 | 12 | — |
| SUTTER HOME WINERY INC. | ST. HELENA, CA | 463 | 4 | — |
| FCSA 32 - CANTUA CREEK | FRESNO, CA | 462 | 238 | — |
| BROCK MUTUAL WATER COMPANY | BAKERSFIELD, CA | 462 | 63 | — |
| SAN SIMEON CSD | SAN SIMEON, CA | 462 | 8 | — |
| RIVERVIEW SCHOOL | REEDLEY, CA | 461 | 19 | — |
| FALLEN LEAF MUTUAL WATER CO | SUTTER CREEK, CA | 461 | 26 | — |