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Hide/show columns: Water System No. | Water System Name |
Type | Distribution System Class | Max Treatment Plant Class |
Principal County Served | Primary Source Water Type |
| Water System No. | Water System Name | Type | Distribution System Class | Max Treatment Plant Class | Principal County Served | Primary Source Water Type |
|---|---|---|---|---|---|---|
| Water System No. | Water System Name | Type | Distribution System Class | Max Treatment Plant Class | Principal County Served | Primary Source Water Type |
| CA4901394 | 7180 HWY 116 LLC | NC | NR | T1 | SONOMA | GW |
| CA4901214 | ADOBE CHRISTIAN CHURCH | NTNC | D1 | T1 | SONOMA | GW |
| CA4900646 | ALEXANDER VALLEY ACRES WATER COMPANY | C | D1 | There are no treatment plants | SONOMA | GW |
| CA4900107 | ALEXANDER VALLEY STORE & BAR | NC | NR | TD | SONOMA | GW |
| CA4900704 | ALEXANDER VALLEY UNION SCHOOL DISTRICT | NTNC | D1 | TD | SONOMA | GW |
| CA4900943 | ALLIANCE REDWOODS CONFERENCE GROUNDS | C | D1 | T1 | SONOMA | GW |
| CA4901334 | AMISTA VINEYARDS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901361 | ANABA WINERY | NC | NR | TD | SONOMA | GW |
| CA4901118 | ANDY'S PRODUCE MARKET, INC. | NTNC | D1 | TD | SONOMA | GW |
| CA4901455 | APERTURE CELLARS | NC | NR | T1 | SONOMA | GW |
| CA4901392 | ARISTA WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901206 | ARMIDA WINERY | NC | NR | TD | SONOMA | GW |
| CA4910018 | ARMSTRONG VALLEY-CAL WATER SERVICE (PUC) | C | D1 | TD | SONOMA | GW |
| CA4901231 | ARROWOOD VINEYARDS & WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901203 | ASTI WINERY | NTNC | D1 | T2 | SONOMA | GU |
| CA4900673 | ATHENA TERRACE MUTUAL WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4900620 | AUSTIN ACRES MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900630 | AUSTIN CREEK MUTUAL (SPRINGHILL) | C | D1 | T1 | SONOMA | GW |
| CA4901189 | AZURE ACRES CD RECOVERY CENTER | NC | NR | T1 | SONOMA | GW |
| CA4901373 | BACA TASTING ROOM | NC | NR | T1 | SONOMA | GW |
| CA4901474 | BACCHUS LANDING CELLARS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901353 | BACIGALUPI VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4901312 | BALLETTO VINEYARDS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900986 | BARTHOLOMEW FOUNDATION | NC | NR | T1 | SONOMA | GW |
| CA4901448 | BELLA VINEYARDS AND WINE CAVES | NC | NR | T1 | SONOMA | GW |
| CA4900693 | BELLEVUE UNION SCH DIST-BELLEVUE SCHOOL | NTNC | D1 | TD | SONOMA | GW |
| CA4900558 | BELMONT TERRACE MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900585 | BENNETT RIDGE MUTUAL WATER COMPANY | C | D1 | There are no treatment plants | SONOMA | GW |
| CA4901204 | BENZIGER FAMILY WINERY | NTNC | D1 | TD | SONOMA | GW |
| CA4901216 | BLUE HERON RESTAURANT | NC | NR | T1 | SONOMA | GW |
| CA4900789 | BLUE SPRUCE MOBILE HOME PARK | C | D1 | T1 | SONOMA | GW |
| CA4901290 | BODEGA BAY OYSTER COMPANY | C | NR | T1 | SONOMA | GW |
| CA4910021 | BODEGA BAY PUBLIC UTILITY DISTRICT | C | D3 | T2 | SONOMA | GW |
| CA4990015 | BODEGA BAY PUD (RECYCLED) | NP | NA | There are no treatment plants | SONOMA | |
| CA4900850 | BODEGA WATER COMPANY | C | D1 | T2 | SONOMA | GU |
| CA4901393 | BOISSET - BUENA VISTA WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900998 | BOISSET - DE LOACH WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901071 | BOULEVARD HEIGHTS MUTUAL WATER | C | D1 | TD | SONOMA | GW |
| CA4900587 | BRAND WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900545 | BRANGER MUTUAL WATER COMPANY, INC. | C | D1 | TD | SONOMA | GW |
| CA4901468 | BRICOLEUR VINEYARDS | NC | D1 | T2 | SONOMA | GW |
| CA4900644 | BRIDGEHAVEN PARK | C | D1 | T2 | SONOMA | SW |
| CA4901375 | BROADWAY MARKET | NC | NR | T1 | SONOMA | GW |
| CA4900687 | BROOKWOOD MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4901277 | BUCHER WATER COMPANY | NTNC | D1 | TD | SONOMA | GW |
| CA4901345 | BUCKLEY FAMILY PARTNERSHIP | NTNC | D1 | TD | SONOMA | GW |
| CA4910024 | CALIFORNIA-AMERICAN GEYSERVILLE (PUC) | C | D1 | T1 | SONOMA | GW |
| CA4910023 | CALIFORNIA-AMERICAN LARKFIELD (PUC) | C | D3 | T2 | SONOMA | GW |
| CA4901030 | CALPINE (GEYSERS ADMINISTRATION CENTER) | NTNC | D1 | T2 | SONOMA | SW |
| CA4901004 | CALPINE (WEST FIELD OFFICE) | NTNC | D1 | TD | SONOMA | GW |
| CA4991030 | CALPINE GEYSERS - RECLAIMED FROM SR | NP | NA | There are no treatment plants | SONOMA | |
| CA4901109 | CAMP LIAHONA REDWOODS | NC | NR | TD | SONOMA | GW |
| CA4910029 | CAMP MEEKER WATER SYSTEM | C | D1 | T1 | SONOMA | GW |
| CA4901105 | CAMP ROYANEH | NC | NR | TD | SONOMA | GW |
| CA4901063 | CAMPOBELLO | NC | NR | TD | SONOMA | GW |
| CA4910022 | CANON MANOR WATER SYSTEM | C | D1 | T1 | SONOMA | GW |
| CA4901257 | CAPITAL LUMBER COMPANY | NTNC | D1 | TD | SONOMA | GW |
| CA4900578 | CARMET BY THE SEA WATER COMPANY | C | D1 | T2 | SONOMA | GU |
| CA4900909 | CARNEROS DELI | NTNC | D1 | T1 | SONOMA | GW |
| CA4901247 | CARNEROS WAREHOUSING | NTNC | D1 | T1 | SONOMA | GW |
| CA4900817 | CASA DEL MAR | NC | D1 | T1 | SONOMA | GW |
| CA4900748 | CASINI RANCH CAMPGROUND | C | NR | TD | SONOMA | GW |
| CA4901412 | CAST ESTATE VINEYARDS & CELLARS | NC | NR | T1 | SONOMA | GW |
| CA4901106 | CATHOLIC CHARITIES - CYO CAMP | NC | NR | T2 | SONOMA | SW |
| CA4901107 | CAZADERO PERFORMING ARTS CAMP | NC | NR | T1 | SONOMA | GW |
| CA4900508 | CAZADERO WATER COMPANY, INC. (PUC) | C | D1 | T1 | SONOMA | GU |
| CA4901390 | CHALK HILL WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901444 | CHAR VALE VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4901360 | CHATEAU DIANA | NC | NR | T1 | SONOMA | GW |
| CA4901382 | CHILDKIND LAGUNA PRESCHOOL | NTNC | D1 | T1 | SONOMA | GW |
| CA4900716 | CINNABAR ELEMENTARY SCHOOL | NTNC | D1 | T1 | SONOMA | GW |
| CA4901027 | CINNABAR THEATER | NC | NR | T1 | SONOMA | GW |
| CA4990014 | CITY OF ROHNERT PARK RECLAMATION | NP | NA | There are no treatment plants | SONOMA | |
| CA4900736 | CLEAR CREEK WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4901278 | CLINE CELLARS | NTNC | D1 | TD | SONOMA | GW |
| CA4910002 | CLOVERDALE, CITY OF | C | D2 | T3 | SONOMA | GU |
| CA4900774 | CLOVERLEAF RANCH SUMMER CAMP | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901144 | COHN WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4900667 | COLLEGE PARK MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900721 | COLONIAL PARK | C | D1 | T2 | SONOMA | GW |
| CA4901423 | COMSTOCK WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901328 | COPAIN WINE CELLARS | NC | NR | T1 | SONOMA | GW |
| CA4901275 | CORNERSTONE SONOMA | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4910016 | COTATI, CITY OF | C | D2 | T2 | SONOMA | GW |
| CA4910306 | CSP-ARMSTRONG REDWOODS STATE RESERVE | NC | D1 | T1 | SONOMA | GW |
| CA4910309 | CSP-FORT ROSS STATE PARK | NC | NR | T3 | SONOMA | GU |
| CA4910313 | CSP-GOAT ROCK STATE BEACH | NC | NR | T2 | SONOMA | GU |
| CA4910305 | CSP-JACK LONDON STATE HISTORIC PARK | NC | NR | TD | SONOMA | GW |
| CA4910304 | CSP-PETALUMA ADOBE STATE HISTORIC PARK | NC | NR | TD | SONOMA | GW |
| CA4910310 | CSP-SALT POINT STATE PARK | NC | NR | T2 | SONOMA | GW |
| CA4910302 | CSP-SUGARLOAF RIDGE STATE PARK | NC | NR | TD | SONOMA | GW |
| CA4910308 | CSP-WRIGHTS BEACH STATE PARK | NC | NR | T2 | SONOMA | GU |
| CA4900871 | DE ANZA MOON VALLEY WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901295 | DEERFIELD RANCH WINERY LLC | NC | NR | TD | SONOMA | GW |
| CA4901346 | DELORES LANE WATER SYSTEM | C | D1 | TD | SONOMA | GW |
| CA4900562 | DIAMOND A MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901447 | DONUM ESTATE WATER SYSTEM | NC | NR | TD | SONOMA | GW |
| CA4901246 | DOWNTOWN GRATON MUTUAL WATER SYSTEM | C | D1 | T1 | SONOMA | GW |
| CA4901024 | DRY CREEK STORE | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901119 | DRY CREEK VINEYARD | NTNC | D1 | TD | SONOMA | GW |
| CA4901060 | DUNCANS MILLS CAMPING CLUB | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900847 | DUNCANS MILLS TRADING COMPANY | NC | D1 | There are no treatment plants | SONOMA | GW |
| CA4900739 | DUNHAM SCHOOL | NTNC | D1 | T1 | SONOMA | GW |
| CA4901464 | DUTCHER CROSSING WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901471 | DUTTON FARMWORKER HOUSING | NTNC | D1 | T2 | SONOMA | GW |
| CA4901384 | DUTTON RANCH CORPORATION | NC | NR | T1 | SONOMA | GW |
| CA4901252 | E & J GALLO WINERY-SONOMA | NTNC | D1 | T1 | SONOMA | GW |
| CA4901425 | E STRING CELLARS | NC | NR | T1 | SONOMA | GW |
| CA4900629 | EAST AUSTIN CREEK MUTUAL WATER COMPANY | NC | NR | T1 | SONOMA | GW |
| CA4901413 | EIGHTH STREET EAST PARTNERS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901404 | EKTIMO VINEYARDS | NC | NR | TD | SONOMA | GW |
| CA4900799 | EL PORTAL MOBILE ESTATES | C | D1 | T1 | SONOMA | GW |
| CA4900547 | END-O-VALLEY MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900728 | EVERGREEN MOBILE ESTATES | C | D1 | TD | SONOMA | GW |
| CA4900684 | FARMER WATER SYSTEM | NC | NR | T1 | SONOMA | GW |
| CA4901433 | FAT PILGRIM GENERAL STORE | NC | NR | T1 | SONOMA | GW |
| CA4901202 | FERRARI-CARANO WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4900968 | FIELD STONE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900559 | FIRCREST MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901253 | FLOWERS WINERY | NC | NR | TD | SONOMA | GW |
| CA4901340 | FOG CREST WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900957 | FOLEY FAMILY WINES CHATEAU ST. JEAN | NTNC | D1 | T1 | SONOMA | GW |
| CA4901261 | FOLEY SONOMA WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900982 | FOPPIANO VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4990019 | FORESTVILLE WATER DISTRICT | NP | NA | There are no treatment plants | SONOMA | |
| CA4910019 | FORESTVILLE WATER DISTRICT | C | D2 | There are no treatment plants | SONOMA | GWP |
| CA4901066 | FORT ROSS LODGE, LLC | NC | NR | TD | SONOMA | GW |
| CA4900679 | FORT ROSS SCHOOL DISTRICT | NTNC | D1 | TD | SONOMA | GW |
| CA4901377 | FORT ROSS VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4900844 | FRANCIS COPPOLA WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4900924 | FREMONT DINER | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900812 | FRIEDMAN BROTHERS HARDWARE | NTNC | D1 | T1 | SONOMA | GW |
| CA4901324 | FRITSCH INDUSTRIAL PARK | NTNC | D1 | There are no treatment plants | SONOMA | GW |
| CA4901283 | FRITZ WINERY AND VINEYARD | NC | NR | TD | SONOMA | GW |
| CA4901449 | FURTHERMORE WINES WATER SYSTEM | NC | NR | T1 | SONOMA | GW |
| CA4901356 | GARY FARRELL WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900973 | GEORGE RANCH MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900705 | GEYSERVILLE NEWTECH ACADEMY SCHOOL | NTNC | D1 | T1 | SONOMA | GW |
| CA4901152 | GEYSERVILLE WINERY | NTNC | D1 | TD | SONOMA | GW |
| CA4900521 | GILL CREEK MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901028 | GLORIA FERRER CAVES | NTNC | D1 | TD | SONOMA | GW |
| CA4901327 | GOLD RIDGE PINOT DBA EMERITUS VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4901395 | GRACIANNA WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901368 | GRATON COMMERCE CENTER | NTNC | D1 | T2 | SONOMA | GW |
| CA4990011 | GRATON COMMUNITY SERVICES DISTRICT | NP | NA | There are no treatment plants | SONOMA | |
| CA4901221 | GRATON MUTUAL (GREEN VALLEY HOA) | C | D1 | TD | SONOMA | GW |
| CA4901130 | GRAVENSTEIN BUSINESS PARK | NTNC | D1 | T1 | SONOMA | GW |
| CA4900708 | GRAVENSTEIN SCHOOL DISTRICT-GRAVENSTEIN | NTNC | D1 | TD | SONOMA | GW |
| CA4900711 | GRAVENSTEIN SCHOOL DISTRICT-HILLCREST | NTNC | D1 | T1 | SONOMA | GW |
| CA4901073 | GRAY WATER SYSTEM | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901218 | GROSKOPF WAREHOUSE & LOGISTICS | NTNC | D1 | T1 | SONOMA | GW |
| CA4901018 | GUNDLACH BUNDSCHU WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901164 | GURDJIEFF FOUNDATION | NC | NR | TD | SONOMA | GW |
| CA4901405 | HAMEL FAMILY WINES | NC | NR | T1 | SONOMA | GW |
| CA4901181 | HANNA VINEYARDS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901442 | HANS FAHDEN VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4900512 | HAPPY ACRES MUTUAL BENEFIT WATER SYSTEM | C | D1 | T1 | SONOMA | GW |
| CA4901331 | HAWKES WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900546 | HAWKINS WATER CO-CAL WATER SERVICE (PUC) | C | D1 | T1 | SONOMA | GW |
| CA4910005 | HEALDSBURG, CITY OF | C | D3 | T3 | SONOMA | GU |
| CA4990013 | HEALDSBURG, CITY OF (RECYCLED WATER) | NP | NA | There are no treatment plants | SONOMA | |
| CA4900612 | HEIGHTS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901388 | HEIRS OF MY DREAM WINERY, INC. | NC | NR | T1 | SONOMA | GW |
| CA4901008 | HESSEL CHURCH | NTNC | NR | T1 | SONOMA | GW |
| CA4901309 | HILTON MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900898 | HILTON PARK FAMILY CAMPGROUND | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900548 | HOLLAND HEIGHTS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901398 | HOOK & LADDER VINEYARDS AND WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901135 | HOOT OWL CREEK/ALEX. VALLEY VINEYARDS JV | NC | NR | TD | SONOMA | GW |
| CA4901348 | HOP KILN WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900680 | HORICON SCHOOL | NTNC | D1 | T2 | SONOMA | SW |
| CA4901426 | HORSE & PLOW TASTING ROOM | NC | NR | T1 | SONOMA | GW |
| CA4900634 | HUCKLEBERRY MUTUAL WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4901244 | HUMANE SOCIETY OF SONOMA COUNTY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901233 | IMAGERY ESTATE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900904 | J VINEYARDS & WINERY | NTNC | D1 | T2 | SONOMA | GW |
| CA4901419 | J. RICKARDS WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901310 | JACUZZI WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901445 | JAMES COURT WATER SYSTEM | C | D1 | T1 | SONOMA | GW |
| CA4901165 | JEHOVAH S WITNESSES HALL | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901414 | JJAPT BLOOMFIELD | NC | NR | T1 | SONOMA | GW |
| CA4901025 | JOHNSON'S BEACH RESORT | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901084 | JORDAN VINEYARD & WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901286 | KELLER ESTATE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900560 | KELLY MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901086 | KENDALL-JACKSON WINE CENTER | NC | NR | T1 | SONOMA | GW |
| CA4901399 | KENWOOD BPSC LLC | NC | NR | T2 | SONOMA | GW |
| CA4910025 | KENWOOD VILLAGE WATER COMPANY (PUC) | C | D1 | T1 | SONOMA | GW |
| CA4900875 | KENWOOD VINEYARDS AND WINERY | NTNC | D1 | TD | SONOMA | GW |
| CA4901062 | KINNYBROOK MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901254 | KJ CARNEROS HILLS WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4990025 | KNIGHTS BRIDGE WATER SYSTEM | NP | There are no treatment plants | SONOMA | ||
| CA4900686 | KOA - CLOVERDALE | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900737 | KOA - PETALUMA | NC | NR | T1 | SONOMA | GW |
| CA4900999 | KORBEL BROTHERS WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901364 | KOZLOWSKI FARMS | NC | NR | T1 | SONOMA | GW |
| CA4901227 | KUNDE ESTATE WINERY | NTNC | D1 | TD | SONOMA | GW |
| CA4900743 | LA CANTERA RACQUET CLUB | NC | NR | TD | SONOMA | GW |
| CA4901232 | LA CREMA WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901112 | LAKE SONOMA MARINA | NC | NR | T2 | SONOMA | SW |
| CA4901465 | LAMBERT BRIDGE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901401 | LANCASTER ESTATE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901133 | LANDMARK VINEYARDS, LTD. | NC | NR | TD | SONOMA | GW |
| CA4900582 | LARKIN WOODS MUTUAL WATER COMPANY | C | There are no treatment plants | SONOMA | GU | |
| CA4901383 | LASSETER FAMILY WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901366 | LAURA CHENEL'S CHEVRE INC. | NTNC | D1 | T2 | SONOMA | GW |
| CA4900588 | LAWNDALE MUTUAL WATER COMPANY | C | D1 | There are no treatment plants | SONOMA | GWP |
| CA4901245 | LEDSON WINERY AND VINEYARDS | NC | NR | TD | SONOMA | GW |
| CA4900832 | LEISURE MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4900714 | LIBERTY SCHOOL | NTNC | D1 | T2 | SONOMA | GW |
| CA4901381 | LICHAU HYLANDS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901190 | LIETO WATER SYSTEM (REACH CHARTR SCHOOL) | NTNC | D1 | T1 | SONOMA | GW |
| CA4900575 | LOCH HAVEN MUTUAL WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4901094 | LOMBARDI'S DELI & BBQ | NC | NR | TD | SONOMA | GW |
| CA4900653 | LONE PINE MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901298 | LYNMAR WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901213 | LYTTON SPRINGS WATER SYSTEM | NTNC | D1 | T1 | SONOMA | GW |
| CA4901220 | LYTTON SPRINGS WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901460 | MACDONALD BUNKHOUSE | NC | NR | TD | SONOMA | GW |
| CA4901406 | MACROSTIE WINERY AND VINEYARD | NC | NR | T2 | SONOMA | GW |
| CA4901330 | MADRONA MANOR | NTNC | D1 | T1 | SONOMA | GW |
| CA4900513 | MADRONE MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900637 | MAGIC MOUNTAIN MUTUAL WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4901068 | MAGNOLIA DRIVE WINE FACILITY | NC | D1 | T1 | SONOMA | GW |
| CA4901282 | MANZANA PRODUCTS COMPANY, INC. | NTNC | D1 | T1 | SONOMA | GW |
| CA4900605 | MARK WEST ACRES MWC | C | D1 | There are no treatment plants | SONOMA | GW |
| CA4900905 | MARK WEST MEADOWS MUTUAL WATER | C | D1 | T1 | SONOMA | GW |
| CA4901093 | MARTINELLI RANCH | NC | NR | T1 | SONOMA | GW |
| CA4901248 | MATANZAS CREEK WINERY | NTNC | D1 | TD | SONOMA | GW |
| CA4901263 | MATRIX WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901284 | MAURITSON FAMILY WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901453 | MAURITSON LABOR HOUSE | NC | NR | T1 | SONOMA | GW |
| CA4990012 | MAYACAMA GOLF CLUB, LLC (RECYCLED WATER) | NP | NA | There are no treatment plants | SONOMA | |
| CA4901454 | MAYACAMAS WAREHOUSE, LLC | NTNC | D1 | T1 | SONOMA | GW |
| CA4901082 | MAZZOCCO WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900551 | MELITA HEIGHTS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901336 | MERRIAM WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901170 | MICHAEL ELLIS SCHOOL FOR DOG TRAINERS | NC | NR | T1 | SONOMA | GW |
| CA4901365 | MICHAEL LUCAS WATER SYSTEM | NTNC | D1 | TD | SONOMA | GW |
| CA4901042 | MICHEL-SCHLUMBERGER FINE WINE ESTATE | NC | NR | T1 | SONOMA | GW |
| CA4900552 | MICHELE MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900813 | MIDGLEY'S COUNTRY FLEA MARKET | NC | NR | T1 | SONOMA | GW |
| CA4900916 | MILL CREEK VINEYARDS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900563 | MISSION HIGHLANDS MUTUAL WATER CO. | C | D1 | TD | SONOMA | GW |
| CA4900720 | MOBILE HOME ESTATES | C | D1 | There are no treatment plants | SONOMA | GW |
| CA4901341 | MOLINO CORNER WATER SYSTEM | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901113 | MOM S APPLE PIE | NC | NR | T1 | SONOMA | GW |
| CA4900533 | MORTON'S WARM SPRINGS / SONOMA SPRINGS | C | D1 | T1 | SONOMA | GW |
| CA4901301 | MOSHIN VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4901101 | MOUNT GILEAD BIBLE CONFERENCE | NC | NR | T1 | SONOMA | GU |
| CA4900798 | MOUNTAIN VIEW MOBILE ESTATES, LLC | C | D1 | T1 | SONOMA | GW |
| CA4901475 | MYCOPIA LLC | NTNC | D1 | T1 | SONOMA | GW |
| CA4901017 | NACO WEST - RUSSIAN RIVER PRESERVE | NC | NR | TD | SONOMA | GW |
| CA4901476 | NALLE WINERY | NC | D1 | T1 | SONOMA | GW |
| CA4901274 | NICHOLSON RANCH WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900785 | NOEL HEIGHTS-CAL WATER SERVICE (PUC) | C | D1 | T3 | SONOMA | GU |
| CA4901197 | NORTH COAST WINE CO. | NC | D1 | T1 | SONOMA | GW |
| CA4900797 | NORTH STAR MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4900695 | NORTHWEST PREP CHARTER SCHOOL | NTNC | D1 | TD | SONOMA | GW |
| CA4900703 | OAK GROVE SCHOOL | NTNC | D1 | TD | SONOMA | GW |
| CA4901175 | OAK GROVE SCHOOL DISTRICT OFFICE | NTNC | NR | There are no treatment plants | SONOMA | GW |
| CA4901141 | OCCIDENTAL ARTS & ECOLOGY CENTER | NTNC | D1 | TD | SONOMA | GW |
| CA4900536 | OCCIDENTAL COMMUNITY SERVICES DISTRICT | C | D1 | T1 | SONOMA | GW |
| CA4990021 | OCCIDENTAL SANITATION DISTRICT | NP | There are no treatment plants | SONOMA | ||
| CA4901196 | OCEAN COVE LODGE - BAR & GRILL | NC | NR | TD | SONOMA | GW |
| CA4910026 | ODD FELLOWS RECREATION CLUB | C | D1 | TD | SONOMA | GW |
| CA4901314 | ODIYAN BUDDHIST RETREAT CENTER | NTNC | D1 | T1 | SONOMA | GW |
| CA4900699 | OLIVET ELEMENTARY SCHOOL | NTNC | D1 | TD | SONOMA | GW |
| CA4901342 | PADMASAMBHAVA PEACE INSTITUTE | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900570 | PALOMINO LAKES MUTUAL WATER CO. | C | D1 | T1 | SONOMA | GW |
| CA4901191 | PARADISE RIDGE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900553 | PARK ROYAL MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901038 | PASSALACQUA WINERY | NC | NR | TD | SONOMA | GW |
| CA4900981 | PEDRONCELLI WINERY | NC | NR | TD | SONOMA | GW |
| CA4910003 | PENNGROVE WATER COMPANY (PUC) | C | D2 | There are no treatment plants | SONOMA | GWP |
| CA4901329 | PEPPERWOOD ENVIRONMENTAL CENTER | NC | NR | TD | SONOMA | GW |
| CA4901079 | PETALUMA LIVESTOCK AUCTION YARD | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4910006 | PETALUMA, CITY OF | C | D4 | T2 | SONOMA | GW |
| CA4990003 | PETALUMA, CITY OF (RECYCLED WATER) | NP | NA | There are no treatment plants | SONOMA | |
| CA4901299 | PETRIFIED FOREST | NC | NR | TD | SONOMA | GW |
| CA4900674 | PINE HILL TERRACE MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4900787 | PLAZA MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4901215 | PLUMFIELD ACADEMY SCHOOL (OCCIDENTAL RD) | NTNC | D1 | T1 | SONOMA | GW |
| CA4901297 | PORT SONOMA MARINA | NTNC | D1 | There are no treatment plants | SONOMA | GW |
| CA4900945 | PRESENTATION SCHOOL | NTNC | D1 | T1 | SONOMA | GW |
| CA4901090 | PRESTON WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901452 | QUARRYHILL BOTANICAL GARDEN | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901162 | QUIVIRA VINEYARDS | NTNC | D1 | T2 | SONOMA | GU |
| CA4901122 | RACK & RIDDLE CUSTOM WINE SERVICES | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900611 | RAINS CREEK WATER DISTRICT | C | D1 | T1 | SONOMA | GW |
| CA4901120 | RAM'S GATE WINERY | NTNC | NR | T1 | SONOMA | GW |
| CA4900514 | RANCHO DEL PARADISO-CAL WATER SVC (PUC) | C | D1 | TD | SONOMA | GWP |
| CA4900599 | RANDAL'S RANCHETTE MUTUAL WATER COMPANY | C | D1 | There are no treatment plants | SONOMA | GW |
| CA4901264 | RATNA LING RETREAT | NTNC | D1 | T2 | SONOMA | SW |
| CA4901179 | REDWOOD EMPIRE SAWMILL | NTNC | D1 | TD | SONOMA | GW |
| CA4900639 | REDWOOD HEIGHTS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900603 | RIEBLI MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900600 | RINCON VALLEY MOBILE ESTATES | C | D1 | TD | SONOMA | GW |
| CA4900577 | RIO LINDO ADVENTIST ACADEMY | C | D1 | T2 | SONOMA | GU |
| CA4900745 | RIVER BEND RESORT | NC | NR | TD | SONOMA | GW |
| CA4901459 | ROBERT YOUNG FAMILY LIMITED PARTNER | NC | NR | T1 | SONOMA | GW |
| CA4900913 | ROBIN WAY WATER SYSTEM | C | D1 | TD | SONOMA | GW |
| CA4901420 | ROCHE FAMILY WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901287 | ROCHIOLI WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900897 | RODNEY STRONG VINEYARDS | NTNC | D1 | T2 | SONOMA | GW |
| CA4910014 | ROHNERT PARK, CITY OF | C | D4 | T2 | SONOMA | GW |
| CA4900846 | ROLLING OAKS ROAD ASSOCIATION | C | D1 | TD | SONOMA | GW |
| CA4900675 | ROSELAND MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4901411 | ROTH WINERY | NC | NR | T1 | SONOMA | GW |
| CA4990010 | RUSSIAN RIVER COUNTY SANITATION DISTRICT | NP | NA | There are no treatment plants | SONOMA | |
| CA4910008 | RUSSIAN RIVER COUNTY WATER DISTRICT | C | D2 | T1 | SONOMA | GW |
| CA4900665 | RUSSIAN RIVER MUTUAL WATER CO. | C | D1 | TD | SONOMA | GW |
| CA4900974 | RUSSIAN RIVER VINEYARDS & RESTAURANT | NC | NR | T1 | SONOMA | GW |
| CA4901115 | RUSSIAN RIVER WINERY | NC | NR | TD | SONOMA | GW |
| CA4901273 | S & W WAREHOUSING, LLC | NTNC | D1 | There are no treatment plants | SONOMA | GW |
| CA4901251 | SAFARI WEST | NTNC | D1 | T1 | SONOMA | GW |
| CA4901432 | SAINI WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900911 | SAINT ANNE'S CROSSING WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901255 | SAINT FRANCIS WINERY-WILD OAK VINEYARDS | NTNC | D1 | T1 | SONOMA | GW |
| CA4900949 | SAINTS PETER & PAUL RUSSIAN CHURCH | NC | NR | TD | SONOMA | GW |
| CA4901168 | SALMON CREEK MIDDLE SCHOOL | NTNC | D1 | T2 | SONOMA | GW |
| CA4900912 | SALT & STONE RESTAURANT | NC | NR | TD | SONOMA | GW |
| CA4901466 | SANGIACOMO WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900878 | SANTA ROSA GOLF & COUNTRY CLUB | NTNC | D1 | T1 | SONOMA | GW |
| CA4901407 | SANTA ROSA LIQUOR AND DELI | NC | NR | TD | SONOMA | GW |
| CA4900796 | SANTA ROSA MOBILE ESTATES | C | D1 | T1 | SONOMA | GW |
| CA4910009 | SANTA ROSA, CITY OF | C | D5 | T1 | SONOMA | GW |
| CA4990004 | SANTA ROSA, CITY OF (RECYCLED WATER) | NP | NA | There are no treatment plants | SONOMA | |
| CA4901431 | SARALEE'S VINEYARD AND TASTING ROOM | NC | NR | T2 | SONOMA | GW |
| CA4901403 | SBRAGIA WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901193 | SCHELLVILLE GRILL | NC | NR | TD | SONOMA | GW |
| CA4901151 | SCHUG CELLARS | NC | NR | TD | SONOMA | GW |
| CA4901409 | SCRIBE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4990008 | SCWA AIRPORT LARKFIELD WIKIUP | NP | NA | There are no treatment plants | SONOMA | |
| CA4990022 | SEA RANCH NORTH SANITATION ZONE | NP | There are no treatment plants | SONOMA | ||
| CA4910007 | SEA RANCH WATER COMPANY,THE (PUC) | C | D2 | T3 | SONOMA | SW |
| CA4991080 | SEARS POINT RACEWAY RECLAMATION | NP | NA | There are no treatment plants | SONOMA | |
| CA4900925 | SEBASTIANI VINEYARDS | NTNC | D1 | TD | SONOMA | GW |
| CA4901436 | SEBASTOPOL CHARTER SCHOOL | NTNC | D1 | T2 | SONOMA | GW |
| CA4901313 | SEBASTOPOL VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4910011 | SEBASTOPOL, CITY OF | C | D2 | T2 | SONOMA | GW |
| CA4901266 | SEGHESIO FARMS | NTNC | D1 | TD | SONOMA | GW |
| CA4901143 | SENECA FAMILY OF AGENCIES | NTNC | D1 | T1 | SONOMA | GW |
| CA4901016 | SEQUOIA WATER COMPANY | NC | NR | TD | SONOMA | GW |
| CA4900647 | SERENO DEL MAR WATER COMPANY (PUC) | C | D1 | T2 | SONOMA | SW |
| CA4900723 | SHAMROCK MOBILE HOME PARK | C | D1 | T1 | SONOMA | GW |
| CA4901374 | SILVER OAK WINE CELLARS LLC | NTNC | NR | T1 | SONOMA | GW |
| CA4900608 | SIX ACRES WATER COMPANY | C | D1 | T1 | SONOMA | GU |
| CA4900901 | SOBRE VISTA WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901293 | SODA ROCK WINERY | NC | NR | TD | SONOMA | GW |
| CA4901176 | SONOMA COAST VILLA | NC | D1 | T1 | SONOMA | GW |
| CA4910010 | SONOMA COUNTY CSA 41-FITCH MOUNTAIN | C | D1 | There are no treatment plants | SONOMA | GWP |
| CA4900549 | SONOMA COUNTY CSA 41-FREESTONE | C | D1 | T2 | SONOMA | SW |
| CA4900532 | SONOMA COUNTY CSA 41-JENNER | C | D1 | T2 | SONOMA | SW |
| CA4900543 | SONOMA COUNTY CSA 41-SALMON CREEK | C | D1 | T2 | SONOMA | SW |
| CA4900640 | SONOMA COUNTY MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GU |
| CA4901223 | SONOMA COUNTY PARKS-PUTNAM PARK | NC | NR | TD | SONOMA | GW |
| CA4901347 | SONOMA COUNTY PARKS-RIVERFRONT PARK | NC | NR | TD | SONOMA | GW |
| CA4901207 | SONOMA COUNTY PARKS-STILLWATER COVE | NC | NR | TD | SONOMA | GW |
| CA4901222 | SONOMA COUNTY PARKS-VET. MEMORIAL BEACH | NC | NR | TD | SONOMA | GW |
| CA4901212 | SONOMA COUNTY PUB WORKS-CENTRAL LANDFILL | NTNC | D1 | TD | SONOMA | GW |
| CA4910020 | SONOMA COUNTY WATER AGENCY | C | D5 | T5 | SONOMA | GW |
| CA4990002 | SONOMA COUNTY WATER AGENCY - RECYCLED | NP | There are no treatment plants | SONOMA | ||
| CA4901258 | SONOMA LODGE | NTNC | D1 | TD | SONOMA | GW |
| CA4900580 | SONOMA MOUNTAIN COUNTY WATER DISTRICT | C | D1 | T1 | SONOMA | GW |
| CA4901077 | SONOMA MOUNTAIN ZEN CENTER | NC | NR | TD | SONOMA | GW |
| CA4990009 | SONOMA NATIONAL GOLF CLUB (RECYCLED) | NP | NA | There are no treatment plants | SONOMA | |
| CA4901446 | SONOMA PACIFIC PALLET COMPANY | NTNC | D1 | T1 | SONOMA | GW |
| CA4900843 | SONOMA RANCH MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901234 | SONOMA SEVENTH DAY ADVENTIST CHURCH | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4990007 | SONOMA STATE RECYCLED NEW PROJECT REVIEW | NP | NA | There are no treatment plants | SONOMA | |
| CA4990006 | SONOMA STATE RECYCLED ONGOING COMPLIANCE | NP | NA | There are no treatment plants | SONOMA | |
| CA4901265 | SONOMA STATE U.-FAIRFIELD OSBORN PRES | NC | NR | TD | SONOMA | GW |
| CA4910027 | SONOMA STATE UNIVERSITY | C | D3 | T1 | SONOMA | GW |
| CA4990017 | SONOMA VALLEY COUNTY SANITATION DISTRICT | NP | NA | There are no treatment plants | SONOMA | |
| CA4901069 | SONOMA VALLEY MOOSE LODGE #2048 | NC | NR | TD | SONOMA | GW |
| CA4901061 | SONOMA WAREHOUSING | NTNC | D1 | T1 | SONOMA | GW |
| CA4901250 | SONOMA WEST HOLDINGS INDUSTRIAL PARK | NTNC | D1 | TD | SONOMA | GW |
| CA4900859 | SONOMA WEST HOLDINGS NORTH PLANT | NTNC | D1 | TD | SONOMA | GW |
| CA4900934 | SONOMA WINE SHOP | NC | NR | TD | SONOMA | GW |
| CA4910012 | SONOMA, CITY OF | C | D3 | T1 | SONOMA | GW |
| CA4900510 | SOUTH CLOVERDALE WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901080 | SPEEDWAY SONOMA LLC | NTNC | D1 | T2 | SONOMA | GU |
| CA4901451 | SPIDER WEB RANCH | NC | NR | T1 | SONOMA | GW |
| CA4990005 | SRJC SHONE FARM POND | NP | NA | There are no treatment plants | SONOMA | |
| CA4901363 | STARLITE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900873 | STEWARTS POINT WATER SYSTEM | NC | NR | T1 | SONOMA | GW |
| CA4900795 | STONEGATE MOBILE HOME PARK | C | D1 | TD | SONOMA | GW |
| CA4901259 | STONESTREET WINERY | NTNC | NR | TD | SONOMA | GW |
| CA4901362 | STRIPE N SEAL | NTNC | D1 | There are no treatment plants | SONOMA | GW |
| CA4901343 | STUHLMULLER VINEYARDS | NC | NR | TD | SONOMA | GW |
| CA4901440 | SUGARLOAF WATER SYSTEM | NC | NR | T1 | SONOMA | GW |
| CA4900907 | SUMMERFIELD WALDORF SCHOOL | NTNC | D1 | T2 | SONOMA | GW |
| CA4900892 | SUMMIT VIEW RANCH MUTUAL WATER CO. | C | D1 | T1 | SONOMA | GW |
| CA4901321 | SUNCE WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900641 | SUNRISE MOUNTAIN MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4900794 | SUNSET PARK COMMUNITY | C | D1 | TD | SONOMA | GW |
| CA4901370 | SUTTER SANTA ROSA REGIONAL HOSPITAL | NTNC | D2 | T2 | SONOMA | GW |
| CA4910004 | SWEETWATER SPRINGS CWD - GUERNEVILLE | C | D2 | T2 | SONOMA | GW |
| CA4910028 | SWEETWATER SPRINGS CWD - MONTE RIO | C | D2 | T2 | SONOMA | GW |
| CA4901355 | TERRACE VIEW WATER SYSTEM | C | D1 | TD | SONOMA | GW |
| CA4901225 | THE RENTAL PLACE | NTNC | D1 | T1 | SONOMA | GW |
| CA4900994 | THOMAS GEORGE ESTATES WINERY | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900584 | TIMBER COVE COUNTY WATER DISTRICT | C | D1 | T2 | SONOMA | SW |
| CA4901046 | TIMBER COVE INN | NTNC | D1 | T2 | SONOMA | GW |
| CA4901308 | TIMBER CREST FARMS | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900841 | TIPS ROADSIDE | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901267 | TLC CHILD & FAMILY SERVICES | NTNC | D1 | T1 | SONOMA | GW |
| CA4901262 | TPWC DBA QUARRY LAKE WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901147 | TRADITIONAL MEDICINALS, INC. | NTNC | D1 | T1 | SONOMA | GW |
| CA4901400 | TRATTORE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900946 | TRENTADUE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901044 | TRIPLE S RANCH | NC | NR | T1 | SONOMA | GW |
| CA4901473 | TRUCK TOPS USA | NC | D1 | T1 | SONOMA | GW |
| CA4901305 | TRUETT & HURST WINERY | NC | NR | T1 | SONOMA | GW |
| CA4900710 | TWIN HILLS SCHOOL DIST-APPLE BLOSSOM SCH | NTNC | D1 | TD | SONOMA | GW |
| CA4900707 | TWIN HILLS SCHOOL DIST-TWIN HILLS SCHOOL | NTNC | D1 | TD | SONOMA | GW |
| CA4900604 | TWIN HILLS VINEYARD | NC | NR | T1 | SONOMA | GW |
| CA4910702 | U.S. ARMY CORPS-LAKE SONOMA HEADQUARTERS | NC | NR | TD | SONOMA | GW |
| CA4910701 | U.S. COAST GUARD TRAINING CENTER | C | D2 | T1 | SONOMA | GWP |
| CA4900936 | UNION HOTEL | NC | NR | TD | SONOMA | GW |
| CA4901269 | UNITED RENTALS | NC | NR | T1 | SONOMA | GW |
| CA4900722 | URJ CAMP NEWMAN | NC | NR | T1 | SONOMA | GU |
| CA4990020 | USCG TRAINING CENTER (RECYCLED) | NP | NA | There are no treatment plants | SONOMA | |
| CA4901074 | VALLEY FORD HOTEL | NC | NR | T1 | SONOMA | GW |
| CA4900568 | VALLEY FORD WATER ASSOCIATION | C | D1 | T1 | SONOMA | GW |
| CA4901208 | VALLEY OF THE MOON PLAZA SHOPPING CENTER | NC | NR | TD | SONOMA | GW |
| CA4910013 | VALLEY OF THE MOON WATER DISTRICT | C | D4 | T2 | SONOMA | GW |
| CA4901333 | VCA FORESTVILLE ANIMAL HOSPITAL | NC | NR | T1 | SONOMA | GW |
| CA4901291 | VERITE WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901129 | VIANSA WINERY | NTNC | D1 | There are no treatment plants | SONOMA | GW |
| CA4900975 | VIMARK TRIONE WINERY | NC | NR | TD | SONOMA | GW |
| CA4901083 | VINEBURG DELI & GROCERY | NC | NR | TD | SONOMA | GW |
| CA4900793 | VINEHILL VISTAS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901236 | VINO FARMS, INC. - PRESTON RANCH | NTNC | D1 | TD | SONOMA | GW |
| CA4901161 | VINO FARMS, INC. - WASSON RANCH | NTNC | D1 | TD | SONOMA | GW |
| CA4901201 | VINWOOD CELLARS PRODUCTION AREA | NTNC | D1 | T1 | SONOMA | GW |
| CA4990024 | VIRGINIA DARE RECYCLED WATER | NP | There are no treatment plants | SONOMA | ||
| CA4900935 | VIRGINIA DARE WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4900033 | WASHOE HOUSE | NC | NR | T1 | SONOMA | GW |
| CA4900669 | WENDELL LANE MUTUAL WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4900719 | WEST SIDE UNION SCHOOL DISTRICT | NTNC | D1 | T1 | SONOMA | GW |
| CA4900893 | WEST WATER COMPANY (PUC) | C | D1 | TD | SONOMA | GW |
| CA4901096 | WESTERBEKE RANCH | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4900791 | WESTERN MOBILE HOME PARK | C | D1 | T2 | SONOMA | GW |
| CA4901095 | WESTMINSTER WOODS CAMP | NTNC | D1 | T1 | SONOMA | GU |
| CA4901408 | WESTSIDE STORAGE WATER SYSTEM | NC | NR | T1 | SONOMA | GW |
| CA4901272 | WILDWOOD RETREAT | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901335 | WILLIAMS SELYEM WINERY | NTNC | D1 | T1 | SONOMA | GW |
| CA4901139 | WILLOWBROOK ALE HOUSE | NC | NR | TD | SONOMA | GW |
| CA4900561 | WILLOWSIDE MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901156 | WILLOWSIDE SCHOOL | NTNC | D1 | T1 | SONOMA | GW |
| CA4900573 | WILSHIRE HEIGHTS MUTUAL WATER COMPANY | C | D1 | TD | SONOMA | GW |
| CA4901338 | WILSON WINERY | NC | NR | T1 | SONOMA | GW |
| CA4910017 | WINDSOR, TOWN OF | C | D4 | T3 | SONOMA | GW |
| CA4990001 | WINDSOR, TOWN OF (RECYCLED WATER) | NP | NA | There are no treatment plants | SONOMA | |
| CA4901300 | WINDY HILL WINERY | NC | NR | TD | SONOMA | GW |
| CA4901332 | WINE COUNTRY IND PARK - BLDG C | NTNC | D1 | T1 | SONOMA | GW |
| CA4901294 | WINE COUNTRY IND PARK-BLDGS A&B | NC | NR | T1 | SONOMA | GW |
| CA4900694 | WRIGHT ELEMENTARY SCHOOL | NTNC | D1 | TD | SONOMA | GW |
| CA4900660 | YULUPA MUTUAL WATER COMPANY | C | D1 | T1 | SONOMA | GW |
| CA4901437 | ZIALENA WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901317 | ZICHICHI WINERY | NTNC | NR | T1 | SONOMA | GW |
| CA4901110 | CAMP CAZADERO | NC | NR | T2 | SONOMA | GU |
| CA4910307 | CSP-AUSTIN CREEK (BULLFROG POND CAMP) | NC | NR | TD | SONOMA | GW |
| CA4910311 | CSP-FISK MILL STATE PARK | NC | NR | TD | SONOMA | GW |
| CA4901154 | GILARDI WATER SYSTEM | NC | There are no treatment plants | SONOMA | GW | |
| CA4900908 | LOS ARROYOS GOLF COURSE | NC | There are no treatment plants | SONOMA | GW | |
| CA4901457 | MOUNTAIN HOME RANCH, INC. | NC | There are no treatment plants | SONOMA | GW | |
| CA4900853 | PACK JACK BAR-B-QUE/WITHERS WATER | NC | NR | T2 | SONOMA | GW |
| CA4901443 | ROBERTS CREEK SUBDIVISON | C | D1 | There are no treatment plants | SONOMA | GW |
| CA4901441 | SEQUOIA WAREHOUSING, LLC | NC | There are no treatment plants | SONOMA | GW | |
| CA4901205 | U.S. ARMY CORPS-LIBERTY GLEN CAMPGROUND | NC | NR | T2 | SONOMA | SW |
| CA4901354 | WILLIAMSON WINES | NC | NR | There are no treatment plants | SONOMA | GW |
| CA4901472 | BELDEN BARNS WATER SYSTEM | NC | D1 | T1 | SONOMA | GW |
| CA4990016 | CLOVERDALE, CITY OF (RECYCLED) | NP | There are no treatment plants | SONOMA | ||
| CA4901461 | K BARR DAUGHTERS WATER SYSTEM | NC | There are no treatment plants | SONOMA | GW | |
| CA4901462 | PRIDE MOUNTAIN VINEYARDS | NC | NR | T1 | SONOMA | GW |
| CA4901396 | RAVENSWOOD WINERY | NC | NR | T1 | SONOMA | GW |
| CA4901477 | SIKH GURDWARA SANTA ROSA | NC | D1 | There are no treatment plants | SONOMA | GW |
| CA4901352 | SONOMA COUNTY PARKS-TOLAY LAKE | NC | There are no treatment plants | SONOMA | GW |