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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 |
| CA4000725 | 141 SUBURBAN ROAD WATER SUPPLY | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000839 | ADA'S LODGES | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000856 | ADELAIDA VINEYARDS & WINERY | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000744 | AFUERA DE CHORRO WATER COMPANY | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000631 | ALMIRA WATER ASSOCIATION | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000834 | ANZA VINEYARD ESTATES MUTUAL WATER CO | C | D1 | T2 | SAN LUIS OBISPO | GW |
| CA4000823 | ARONHILL VINEYARD | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4010002 | ATASCADERO MUTUAL WATER CO | C | D4 | T2 | SAN LUIS OBISPO | GW |
| CA4010832 | ATASCADERO STATE HOSPITAL | C | D2 | TD | SAN LUIS OBISPO | GW |
| CA4000222 | AVILA BEACH COMMUNITY SERVICES DISTRICT | C | D1 | There are no treatment plants | SAN LUIS OBISPO | SWP |
| CA4090013 | AVILA BEACH CSD - RW | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000716 | AVILA VALLEY MUTUAL WATER CO | C | D1 | T1 | SAN LUIS OBISPO | SWP |
| CA4000644 | BABE RUTH'S OAK VIEW | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000209 | BALL TAGAWA GROWERS | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000214 | BARON CANYON MUTUAL WATER CO. | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000200 | BASSI RANCH MUTUAL WATER CO. | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4090005 | BAYWOOD PARK/ LOS OSOS - RWP | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000660 | BEAR VALLEY WATER COMPANY | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000733 | BIDDLE REGIONAL COUNTY PARK | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000846 | BOOKER WINERY | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000675 | BRANCH ELEMENTARY SCHOOL | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000850 | BRECON ESTATE | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000845 | CAELESTA WINERY | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000640 | CAL SHASTA CLUB | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4010830 | CALIFORNIA MENS COLONY | C | D3 | T3 | SAN LUIS OBISPO | SW |
| CA4090001 | CALIFORNIA MENS COLONY - RW | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000805 | CALLENDER GROVE MUTUAL WATER | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4010900 | CALTRANS - SHANDON REST STOP | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4010014 | CAMBRIA COMM SERVICES DIST | C | D2 | T3 | SAN LUIS OBISPO | GW |
| CA4090015 | CAMBRIA CSD - RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000230 | CANYON CREST MUTUAL BENEFIT WC | C | D1 | There are no treatment plants | SAN LUIS OBISPO | SWP |
| CA4000847 | CARPENTER WINERY | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000732 | CARRISA PLAINS ELEMENTARY | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4010006 | CAYUCOS BEACH MUTUAL WATER COMPANY | C | D1 | TD | SAN LUIS OBISPO | SWP |
| CA4090019 | CAYUCOS SANITARY DISTRICT | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000831 | CENTER OF EFFORT WINERY | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000757 | CERRO ALTO CAMPGROUND | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000851 | CHAMISAL VINEYARDS | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010030 | CHORRO VALLEY PIPELINE - SLO COUNTY | C | D3 | There are no treatment plants | SAN LUIS OBISPO | SWP |
| CA4000642 | CHRISTMAS COVE | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4010001 | CITY OF ARROYO GRANDE UTILITIES DIVISION | C | D4 | T2 | SAN LUIS OBISPO | SWP |
| CA4010004 | CITY OF GROVER BEACH PUBLIC WORKS DEPT | C | D3 | T2 | SAN LUIS OBISPO | SW |
| CA4090017 | CITY OF PASO ROBLES RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4010007 | CITY OF PASO ROBLES WATER DIVISION | C | D4 | T3 | SAN LUIS OBISPO | SW |
| CA4090018 | CITY OF PISMO BEACH RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4090002 | CITY OF SAN LUIS OBISPO, SANITATION DEPT | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000844 | COASTAL CHRISTIAN SCHOOL | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000809 | CONGREGATION BETH DAVID | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000637 | COUNTRY HILLS ESTATES | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000590 | COUNTY OF MONTEREY-LAKE NACIMIENTO | NTNC | D1 | T2 | SAN LUIS OBISPO | GU |
| CA4000843 | COURTSIDE CELLARS | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000210 | CRESTON COUNTRY STORE | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000693 | CRESTON ELEMENTARY SCHOOL | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000598 | CUYAMA LANE WATER COMPANY | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4090006 | CYPRESS RIDGE DEVELOPMENT RW | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000825 | DAOU VINEYARDS, LLC | NTNC | NR | T1 | SAN LUIS OBISPO | GW |
| CA4000817 | EAST AIRPORT FIERO LANE WATER COMPANY | NTNC | D1 | T2 | SAN LUIS OBISPO | GW |
| CA4000202 | EDNA VALLEY RANCH EAST | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000819 | EDNA VALLEY VINEYARDS | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000671 | ELKS LODGE #322 | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4090003 | EMERALD HILLS ESTATES RW | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4090012 | FIERO LANE RECYCLED WATER COMPANY | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000722 | FIERO LANE WATER COMPANY, INC. | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | SWP |
| CA4000507 | GARDEN FARMS C.W.D. | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010023 | GOLDEN STATE WATER COMPANY - EDNA | C | D2 | T2 | SAN LUIS OBISPO | GW |
| CA4010017 | GOLDEN STATE WATER COMPANY - LOS OSOS | C | D3 | T2 | SAN LUIS OBISPO | GW |
| CA4010018 | GOLDEN STATE WATER COMPANY - NIPOMO | C | D2 | T2 | SAN LUIS OBISPO | GW |
| CA4010040 | GOLDEN STATE WATER COMPANY-CYPRESS RIDGE | C | D2 | T2 | SAN LUIS OBISPO | GW |
| CA4000853 | GRAN CIELO MUTUAL WATER COMPANY | C | D1 | T2 | SAN LUIS OBISPO | GW |
| CA4000700 | GRANITE RIDGE | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000554 | GREEN RIVER MUTUAL WATER CO. | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000211 | GREENHEART FARMS | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000854 | GROSSO KRESSER WINERY | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000555 | GUADALUPE COOLING COMPANY | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000741 | H2O, INC | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000501 | HALCYON WATER SYSTEM | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000747 | HALFWAY STATION | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000694 | HARMONY WATER WORKS | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010301 | HEARST MEMORIAL STATE BEACH | NC | D1 | T2 | SAN LUIS OBISPO | SWP |
| CA4010300 | HEARST MONUMENT STATE PARK | NTNC | D2 | T2 | SAN LUIS OBISPO | SW |
| CA4010012 | HERITAGE RANCH CSD | C | D2 | T3 | SAN LUIS OBISPO | SW |
| CA4000563 | HIGUERA APARTMENTS | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000730 | HOLDGRAFER & ASSOCIATES | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000770 | HORIZON LANE WATER SUPPLY | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000788 | HUNTER RANCH GOLF COURSE | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000835 | INDEPENDENCE WATER SYSTEM | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000824 | INN AT OPOLO KITCHEN, THE | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000203 | IRISH HILLS MUTUAL WATER CO | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000768 | J M SIMS WATER SUPPLY | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000849 | JADA VINEYARD AND WINERY | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000648 | KEN MAR GARDENS | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000221 | LAETITIA VINEYARD & WINERY INC | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000705 | LAGUNA NEGRA MUTUAL WATER CO. | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000664 | LAGUNA VISTA BOAT CLUB | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000815 | LAS VENTANAS RANCH | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000206 | LAUREATE WATER COMPANY | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000708 | LOADING CHUTE | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000707 | LONGBRANCH SALOON, THE | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4010022 | LOPEZ PROJECT | C | D3 | T4 | SAN LUIS OBISPO | SW |
| CA4000701 | LOPEZ RECREATION AREA | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010016 | LOS OSOS COMMUNITY SERVICES DISTRICT | C | D2 | T2 | SAN LUIS OBISPO | GW |
| CA4090010 | LOS OSOS CSD - WWTP | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000649 | LOS ROBLES MOBILE HOME ESTATES | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000780 | MADONNA INN WATER COMPANY | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000650 | MESA DUNES MOBILE HOME ESTATES | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4090004 | MONARCH GROVE RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4010305 | MONTANA DE ORO STATE PARK | NC | D1 | TD | SAN LUIS OBISPO | SWP |
| CA4000808 | MONTE SERENO MUTUAL BENEFIT WATER | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010011 | MORRO BAY PW DEPT - WATER DIVISION | C | D3 | T2 | SAN LUIS OBISPO | SWP |
| CA4090016 | MORRO BAY RECYCLED WATER SYSTEM | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4010015 | MORRO ROCK MUTUAL WATER CO | C | D2 | TD | SAN LUIS OBISPO | SWP |
| CA4000848 | MT. OLIVE ORGANIC FARM | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000775 | MUSTANG SPRINGS MUTUAL WATER | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000623 | MUTUAL WATER ASSOCIATION | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4010027 | NACIMIENTO WATER COMPANY | C | D2 | T3 | SAN LUIS OBISPO | SW |
| CA4010080 | NACIMIENTO WATER PROJECT | C | D2 | There are no treatment plants | SAN LUIS OBISPO | SW |
| CA4000818 | NINER WINE ESTATES, LLC | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4010026 | NIPOMO COMM SERVICES DIST | C | D3 | TD | SAN LUIS OBISPO | SWP |
| CA4000734 | NOLL PROPERTIES | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000652 | NORTHSHORE S & B, INC | NC | D1 | T1 | SAN LUIS OBISPO | SW |
| CA4010005 | OCEANO COMM SERVICES DIST. | C | D2 | T1 | SAN LUIS OBISPO | SWP |
| CA4000830 | OCTAGON BARN CENTER ASSOCIATION | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000226 | PACIFIC DUNES RANCH | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000604 | PARAGON TRIANGLE WATER SUPPLY | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000832 | PARRISH FAMILY WINERY | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000778 | PARSONS WATER SUPPLY | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000781 | PASO 360 | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000692 | PASO ROBLES CHEVROLET CADILLAC | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000790 | PASO ROBLES RV RANCH | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000589 | PG&E | NTNC | D1 | T2 | SAN LUIS OBISPO | SW |
| CA4010008 | PISMO BEACH WATER DEPARTMENT | C | D3 | TD | SAN LUIS OBISPO | SWP |
| CA4090007 | PISMO RANCH RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000837 | PLAYA DULCE | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000774 | PLEASANT VALLEY ELEMENTARY | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000800 | PORT SAN LUIS HARBOR DISTRICT | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | SWP |
| CA4000224 | PRECISION MUTUAL WATER COMPANY | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000684 | RAGGED POINT INN | NTNC | D1 | T2 | SAN LUIS OBISPO | GU |
| CA4000653 | RANCHO COLINA MOBILE HOME PARK | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000771 | RANCHO NIPOMO WATER COMPANY | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000803 | RANCHO SALINAS MBWC | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000654 | RESTHAVEN MOBILE HOME PARK | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000750 | RIM ROCK WATER COMPANY | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000655 | RINCONADA TRAILER PARK | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000523 | S & T MUTUAL WATER COMPANY | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4090008 | SAN LUIS OBISPO CSA NO. 18 | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4010009 | SAN LUIS OBISPO WATER DEPARTMENT | C | D4 | T5 | SAN LUIS OBISPO | SW |
| CA4010010 | SAN MIGUEL COMMUNITY SERVICES DISTRICT | C | D2 | TD | SAN LUIS OBISPO | GW |
| CA4010003 | SAN MIGUELITO MWC | C | D2 | T2 | SAN LUIS OBISPO | SWP |
| CA4000699 | SAN PASO TRUCK STOP | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000568 | SAN SIMEON CSD | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4090014 | SAN SIMEON RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000656 | SANTA MARGARITA KOA | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000842 | SANTA MARGARITA RANCH HEADQUARTERS | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000714 | SANTA MARGARITA RECREATION AREA | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000802 | SANTA YSABEL RANCH MWC | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000838 | SIXMILEBRIDGE WINERY | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4010028 | SLO CSA NO. 16 - SHANDON | C | D2 | TD | SAN LUIS OBISPO | SWP |
| CA4010025 | SLO CWD NO. 10 - CAYUCOS WTP | C | D2 | T3 | SAN LUIS OBISPO | SW |
| CA4010024 | SLO CWWD NO. 23 - SANTA MARGARITA | C | D2 | T2 | SAN LUIS OBISPO | GW |
| CA4000753 | SLO PARTNERS | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4010901 | SLOCSA #10A - CAYUCOS | C | D2 | There are no treatment plants | SAN LUIS OBISPO | SWP |
| CA4000789 | SPANISH LAKES MUTUAL WATER CO | C | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000208 | SPEEDLING, INC | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4090011 | STRASBAUGH RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000777 | STRASBAUGH, INC | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000702 | SUNSET DRIVE-IN SNACK BAR | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000841 | SUTTER HOME WINERY INC. TRINCHERO CC | NTNC | D1 | T2 | SAN LUIS OBISPO | GW |
| CA4000689 | SYCAMORE MINERAL SPRINGS RESORT | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000678 | TALLEY FARMS LABOR HOUSING | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000216 | TANK FARM BUSINESS PARK | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010019 | TEMPLETON CSD | C | D2 | T2 | SAN LUIS OBISPO | GW |
| CA4000749 | TERRA DE ORO WATER COMPANY | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000205 | TIGER WATER SUPPLY | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000752 | TMC SUBURBAN, LLC | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000213 | TOYOTA SAN LUIS OBISPO | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000659 | TRI COUNTIES CLUB | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000620 | USASA-POM ENCLAVE - CAMP ROBERTS | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000806 | VACHELL WATER SYSTEM | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000765 | VARIAN RANCH MUTUAL WATER | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000829 | VINES R.V. RESORT | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000670 | WALNUT HILLS MUTUAL WATER CO | C | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000766 | WASTE CONNECTIONS WATER CO | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000506 | WOODLAND PARK MUTUAL WATER CO | C | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4010081 | WOODLANDS DEVELOPMENT | C | D2 | TD | SAN LUIS OBISPO | GW |
| CA4090009 | WOODLANDS DEVELOPMENT RECYCLED WATER | NP | There are no treatment plants | SAN LUIS OBISPO | ||
| CA4000852 | ZOO MED-WINTERHAVEN | NTNC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000717 | 200 SUBURBAN ROAD WATER SUPPLY | NTNC | There are no treatment plants | SAN LUIS OBISPO | GW | |
| CA4000512 | BELLA VISTA MOBILE LODGE | C | D1 | Missing treatment classification in SDWIS | SAN LUIS OBISPO | GW |
| CA4000643 | BLACK MOUNTAIN R.V. RESORT | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000300 | BROKEN EARTH WINERY | NTNC | There are no treatment plants | SAN LUIS OBISPO | GW | |
| CA4000207 | CLEARWATER NURSERY | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000201 | FIRST BAPTIST CHURCH | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000223 | GOLDBERG BROTHERS PROPERTIES, INC. | NTNC | D1 | T2 | SAN LUIS OBISPO | GW |
| CA4000827 | HUERHUERO RANCH MUTUAL WATER COMPANY | C | Missing treatment classification in SDWIS | SAN LUIS OBISPO | GW | |
| CA4000673 | JACK RANCH CAFE | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000820 | KUKKULA INC | NC | NR | TD | SAN LUIS OBISPO | GW |
| CA4000219 | LINKS AT VISTA DEL HOMBRE, THE | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000225 | PHILLIPS 66 COMPANY, SANTA MARIA FACILIT | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000698 | POZO SALOON | NC | NR | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000821 | SALISBURY VINEYARDS WATER SYSTEM | NC | There are no treatment plants | SAN LUIS OBISPO | GW | |
| CA4000711 | SAN LUIS BUSINESS PARK | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000703 | SAN SIMEON CREEK RANCH | NC | NR | Operator is not required | SAN LUIS OBISPO | GW |
| CA4000767 | SANTA LUCIA SCHOOL | NTNC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000783 | SANTA MARIA SPEEDWAY | NC | D1 | T1 | SAN LUIS OBISPO | GW |
| CA4000804 | TRUMPET VINE CATERING | NC | There are no treatment plants | SAN LUIS OBISPO | GW | |
| CA4000743 | UPS - SAN LUIS OBISPO | NTNC | Missing treatment classification in SDWIS | SAN LUIS OBISPO | GW | |
| CA4000728 | WHITSON INDUSTRIAL PARK | NTNC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |
| CA4000833 | GREENGATE RANCH & VINEYARDS | NC | D1 | TD | SAN LUIS OBISPO | GW |
| CA4000836 | HOPE WINERY | NC | There are no treatment plants | SAN LUIS OBISPO | GW | |
| CA4000855 | JACK READY IMAGINATION PARK | NC | D1 | There are no treatment plants | SAN LUIS OBISPO | GW |