| CITY OF SANTA MARIA UTILITIES DEPARTMENT | 109,477 | 13 | Detected |
| CITY OF SANTA BARBARA WATER DEPARTMENT | 98,872 | 9 | Detected |
| GOLETA WATER DISTRICT | 84,462 | 22 | Detected |
| LOMPOC-CITY WATER UTILITY DIV | 40,473 | 8 | Detected |
| GOLDEN STATE WATER COMPANY - ORCUTT | 34,102 | 2 | Detected |
| CARPINTERIA VALLEY WATER DISTRICT | 15,996 | 10 | Detected |
| AMERICAN WATER O&M, LLC - VSFB | 14,971 | 17 | Detected |
| MONTECITO WATER DIST | 11,962 | 10 | Detected |
| GUADALUPE WATER DEPARTMENT | 8,897 | 17 | Detected |
| VANDENBERG VILLAGE COMM. SERV. DIST. | 7,308 | 2 | Detected |
| SANTA YNEZ RIVER WATER CONS. DIST. ID#1 | 7,022 | 27 | Detected |
| SOLVANG WATER DIVISION | 6,126 | 38 | Detected |
| CITY OF BUELLTON WATER DIVISION | 5,161 | 13 | Detected |
| LA CUMBRE MUTUAL WATER CO | 4,861 | 7 | Detected |
| CAL TRANS - GAVIOTA RSR | 4,690 | 6 | — |
| MISSION HILLS CSD | 3,600 | 6 | Detected |
| GOLDEN STATE WATER COMPANY - TANGLEWOOD | 1,947 | 0 | — |
| LOS ALAMOS COMMUNITY SERVICES DISTRICT | 1,534 | 6 | — |
| NOJOQUI FALLS COUNTY PARK | 1,502 | 10 | — |
| RANCHO MARIA GOLF COURSE | 1,000 | 9 | — |
| LA PURISIMA GOLF COURSE | 1,000 | 5 | — |
| LAKE CACHUMA COUNTY PARK | 1,000 | 2 | — |
| RSM RESORT LLC | 1,000 | 8 | — |
| GATEHOUSE TASTING ROOM AT BIEN NACIDO | 950 | 0 | — |
| EL CAPITAN BEACH STATE PARK | 915 | 2 | — |
| WINDSET FARMS GREENHOUSES | 900 | 12 | — |
| JALAMA BEACH PARK | 882 | 10 | — |
| REFUGIO STATE BEACH | 855 | 2 | — |
| LOS PRIETOS COMPLEX | 845 | 13 | — |
| CUYAMA COMMUNITY SERVICES DISTRICT | 700 | 61 | — |
| ARCTIC COLD | 623 | 0 | — |
| BONITA SCHOOL | 589 | 10 | — |
| DIERBERG/STAR LANE VINEYARD | 550 | 0 | — |
| SAN VICENTE WATER COMPANY | 550 | 48 | — |
| GOLDEN STATE WATER COMPANY - LAKE MARIE | 545 | 0 | — |
| WHITE LOTUS | 503 | 0 | — |
| RANCHO ALEGRE | 500 | 2 | — |
| VALLEY PACIFIC PETROLEUM SERVICES | 500 | 0 | — |
| PENCE VINEYARDS | 460 | 1 | — |
| RANCHO OSO | 416 | 12 | — |
| FESS PARKER WINERY | 415 | 2 | — |
| LO-FI WINERY | 413 | 4 | — |
| SOUTH COAST INN | 339 | 2 | — |
| EL CAPITAN MUTUAL WATER COMPANY | 325 | 20 | — |
| WOODSTOCK RANCH | 325 | 2 | — |
| SAINT MARIE MOBILE HOME PARK | 320 | 29 | — |
| SHEPHERD OF THE VALLEY | 320 | 12 | — |
| LAS CRUCES STATE PARK | 306 | 2 | — |
| SANTA YNEZ RANCHO ESTATES | 304 | 2 | — |
| SKYLINE PARK | 295 | 21 | — |