We found 347 public water systems in Napa county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Napa, City Of | Napa | 86,051 | 52 | 8 |
| American Canyon, City Of | American Canyon | 20,315 | 39 | 7 |
| St. Helena, City Of | St. Helena | 6,004 | 0 | 5 |
| Calistoga, City Of | Calistoga | 5,180 | 0 | 8 |
| Town Of Yountville | County of Napa | 3,953 | 0 | 3 |
| Veterans Home Of California | County of Napa | 2,933 | 0 | 4 |
| Rancho Monticello Resort | County of Napa | 2,900 | 0 | 0 |
| Pacific Union College | County of Napa | 2,360 | 0 | 5 |
| Howell Mountain Mutual Water Company | County of Napa | 2,070 | 0 | 42 |
| Lake Berryessa Marina Resort - Inactive | County of Napa | 2,000 | 0 | 0 |
| Pacific Union College | County of Napa | 2,000 | 0 | 0 |
| Napa-berryessa Resort | County of Napa | 1,150 | 0 | 0 |
| Spanish Flat Resort | County of Napa | 1,150 | 0 | 0 |
| Freemark Abbey Properties | County of Napa | 1,000 | 0 | 10 |
| South Shore Resort | County of Napa | 1,000 | 0 | 0 |
| St. Helena Hospital | County of Napa | 957 | 0 | 5 |
| Berryessa Highlands | County of Napa | 924 | 0 | 10 |
| Spanish Flat Calif Water Dist | County of Napa | 700 | 0 | 0 |
| Napa Pipe Redevelopment Partners | County of Napa | 650 | 0 | 0 |
| Circle Oaks Water District | County of Napa | 500 | 0 | 4 |
| Berryessa Park Hdqtrs | County of Napa | 500 | 0 | 0 |
| Chimney Rock Golf Course | County of Napa | 500 | 0 | 0 |
| Macedonian Picnic Ground | County of Napa | 500 | 0 | 0 |
| Berryessa Estates (lbrid) | Napa | 454 | 4 | 35 |
| Csp-bothe-napa State Park | County of Napa | 410 | 0 | 2 |
| Napa Valley Country Club | County of Napa | 400 | 0 | 3 |
| Basalt Rock Company | County of Napa | 400 | 0 | 0 |
| Beringer Wine World | County of Napa | 360 | 0 | 0 |
| Csp - Bale Grist Mill State Historic Par | County of Napa | 350 | 0 | 2 |
| Meyers Water Co. | County of Napa | 310 | 0 | 17 |
| Beringer Vineyards | County of Napa | 300 | 0 | 2 |
| Mt George School | County of Napa | 275 | 0 | 0 |
| Berryessa Pines Water System | County of Napa | 261 | 0 | 9 |
| Silverado Pines Mobile Home | County of Napa | 255 | 0 | 16 |
| Napa Mobil Manor | County of Napa | 255 | 0 | 0 |
| Pueblo Trailer Park - Inactive | County of Napa | 255 | 0 | 0 |
| Soda Canyon Store | County of Napa | 250 | 0 | 12 |
| Skyline Park | County of Napa | 250 | 0 | 7 |
| Capell Valley Estates | County of Napa | 250 | 0 | 34 |
| Vinter S Village | County of Napa | 250 | 0 | 0 |
| Lake Berryessa Park | County of Napa | 250 | 0 | 0 |
| Provenance Vineyards | County of Napa | 245 | 0 | 8 |
| Spanish Flat Water District | County of Napa | 230 | 0 | 5 |
| Franciscan Winery | County of Napa | 200 | 0 | 3 |
| Tucker Acres Mutual Water Co. | County of Napa | 200 | 0 | 18 |
| Welcome Grange Hall | County of Napa | 200 | 0 | 8 |
| The Ranch Winery | County of Napa | 200 | 0 | 10 |
| Milat Winery | County of Napa | 200 | 0 | 2 |
| Putah Canyon Campground | County of Napa | 200 | 0 | 29 |
| Enchanted Hills | County of Napa | 200 | 0 | 6 |
| Domaine Chandon | County of Napa | 200 | 0 | 16 |
| Napa Valley State Park | County of Napa | 200 | 0 | 0 |
| Silverado Pines Mobilehome | County of Napa | 200 | 0 | 0 |
| Moskowite Corners | County of Napa | 200 | 0 | 0 |
| Oak Lake Park | County of Napa | 200 | 0 | 0 |
| Hansen, Gordon Training Stable | County of Napa | 200 | 0 | 0 |
| Sterling International Winery | County of Napa | 200 | 0 | 0 |
| Wine Country, Inc. | County of Napa | 200 | 0 | 0 |
| Mt. George Estate | County of Napa | 190 | 0 | 0 |
| Syar Industries | County of Napa | 180 | 0 | 0 |
| Raymond Vineyard & Cellar | County of Napa | 175 | 0 | 0 |
| Kent Rasmussen Winery | County of Napa | 175 | 0 | 0 |
| Rutherford Hill Mutual Water | County of Napa | 170 | 0 | 1 |
| Howell Mountain School | County of Napa | 170 | 0 | 0 |
| Gene Norris Plaza | County of Napa | 150 | 0 | 5 |
| Napa-solano Girl Scouts | County of Napa | 150 | 0 | 0 |
| Clos Pegase Winery | County of Napa | 150 | 0 | 7 |
| Mont St. John Cellars | County of Napa | 150 | 0 | 6 |
| The Vineyard | County of Napa | 150 | 0 | 0 |
| Turtle Rock Water Supply | County of Napa | 150 | 0 | 0 |
| Sterling Vineyards | County of Napa | 150 | 0 | 0 |
| Silver Pony School | County of Napa | 150 | 0 | 0 |
| Chateau Potelle | County of Napa | 150 | 0 | 0 |
| Syar Industries | County of Napa | 130 | 0 | 8 |
| P O Box 238 Rutherford 94573 | County of Napa | 130 | 0 | 0 |
| Robert Keenan Winery | County of Napa | 125 | 0 | 1 |
| Rombauer Vineyards | County of Napa | 125 | 0 | 6 |
| Chateau Boswell | County of Napa | 125 | 0 | 4 |
| Chateau Montelena Winery | County of Napa | 125 | 0 | 5 |
| Carneros School | County of Napa | 125 | 0 | 0 |
| Quintessa Winery Water System | St. Helena | 114 | 0 | 0 |
| Woodlot Assoc.,inc. | County of Napa | 113 | 0 | 0 |
| Aetna Springs Golf Course | County of Napa | 100 | 0 | 0 |
| Duffy S Myrtledale Resort | County of Napa | 100 | 0 | 0 |
| Whitehall Lane Winery | County of Napa | 100 | 0 | 0 |
| Lokoya Redwoods | County of Napa | 100 | 0 | 0 |
| Napa County Schools: Pope Valley | County of Napa | 100 | 0 | 0 |
| Howell Mtn School | County of Napa | 100 | 0 | 0 |
| Cakebread Cellar | County of Napa | 100 | 0 | 0 |
| Caymus Vineyards | County of Napa | 100 | 0 | 0 |
| Chimney Rock Winery | County of Napa | 100 | 0 | 0 |
| Mt. George Estates | County of Napa | 100 | 0 | 0 |
| Sterling Vineyards | County of Napa | 100 | 0 | 0 |
| Round Hill Winery | County of Napa | 100 | 0 | 0 |
| Silver Oak Wine Cellars | County of Napa | 100 | 0 | 0 |
| Laird Wine Studio | County of Napa | 100 | 0 | 0 |
| Silverado Vineyards | County of Napa | 100 | 0 | 0 |
| Sinskey Winery | County of Napa | 100 | 0 | 0 |
| Hess Winery | County of Napa | 100 | 0 | 0 |
| Newton Vineyard | County of Napa | 100 | 0 | 0 |
| Beaulieu Vineyard | County of Napa | 100 | 0 | 0 |
| Clos Du Val Wine Co. | County of Napa | 100 | 0 | 0 |
| Nvusd: Carneros School | County of Napa | 100 | 0 | 0 |
| Nvusd: Mt. George School | County of Napa | 100 | 0 | 0 |
| Wild Horse Valley Ranch | County of Napa | 100 | 0 | 0 |
| Opus One Winery | County of Napa | 100 | 0 | 0 |
| Cardinale Estate | County of Napa | 100 | 0 | 0 |
| Rudd Wines, Inc., Dba Rudd | County of Napa | 100 | 0 | 0 |
| Conn Creek Winery | County of Napa | 100 | 0 | 0 |
| Sutter Home Winery | County of Napa | 100 | 0 | 0 |
| St. Clement Vineyards Inc. | County of Napa | 100 | 0 | 0 |
| Usibelli Lodge | County of Napa | 100 | 0 | 0 |
| Bale Mill | County of Napa | 100 | 0 | 0 |
| Bar 49 Ranch | County of Napa | 100 | 0 | 0 |
| Vineyard Knolls Golf Course | County of Napa | 100 | 0 | 0 |
| Mtn Mill House | County of Napa | 100 | 0 | 0 |
| Santana Dharma Camp | County of Napa | 100 | 0 | 0 |
| Odd Fellow Park (chg. District) | County of Napa | 100 | 0 | 0 |
| Tucker Acres Mutual Water Co. | County of Napa | 100 | 0 | 0 |
| Milliken Camp | County of Napa | 100 | 0 | 0 |
| Suzies On The Mountain | County of Napa | 100 | 0 | 0 |
| Wine Valley Inn | County of Napa | 100 | 0 | 0 |
| Nvusd: Capell Valley School | County of Napa | 100 | 0 | 0 |
| Nvusd: Wooden Valley School | County of Napa | 100 | 0 | 0 |
| Anderson Vineyard | County of Napa | 100 | 0 | 0 |
| Atlas Peak Vineyards | County of Napa | 100 | 0 | 0 |
| Piazza Winery | County of Napa | 99 | 0 | 0 |
| Berryessa Park Water Co | County of Napa | 80 | 0 | 0 |
| Country Inn, The | County of Napa | 79 | 0 | 0 |
| Markley Cove Resort | County of Napa | 75 | 0 | 0 |
| Pine Ridge Winery | County of Napa | 75 | 0 | 0 |
| White Sulphur Springs Resort | County of Napa | 75 | 0 | 0 |
| WRIGHTS CORNER | County of Napa | 75 | 0 | 0 |
| St. Andrews Winery | County of Napa | 75 | 0 | 0 |
| A-1 Market | County of Napa | 75 | 0 | 0 |
| Mt St Helena Hi-way Spring | County of Napa | 75 | 0 | 0 |
| Coombs Ranch Campground | County of Napa | 75 | 0 | 0 |
| Flora Springs | County of Napa | 75 | 0 | 0 |
| Manley S Resort | County of Napa | 75 | 0 | 0 |
| Moore S Resort | County of Napa | 70 | 0 | 0 |
| La Tierra Heights Mutual | County of Napa | 67 | 0 | 0 |
| River Ranch Farm Worker Center | County of Napa | 66 | 0 | 0 |
| Mondavi Farm Worker Center | County of Napa | 63 | 0 | 0 |
| Calistoga Farm Worker Center | County of Napa | 63 | 0 | 0 |
| U.s. Bureau Of Reclamation-lk. Berryessa | County of Napa | 61 | 0 | 0 |
| Wine Country Inn | County of Napa | 60 | 0 | 0 |
| Titus Winery Water System | County of Napa | 60 | 0 | 0 |
| Christian Bros | County of Napa | 60 | 0 | 0 |
| Ct Life Insurance Co | County of Napa | 60 | 0 | 0 |
| New El Faro Restaurant | County of Napa | 60 | 0 | 0 |
| Homestake Mining Company-napa County | County of Napa | 60 | 0 | 0 |
| Milton Road Water Company | County of Napa | 55 | 0 | 0 |
| Lake Berryessa Boy Scout Camp | County of Napa | 55 | 0 | 0 |
| Napa County Animal Shelter | County of Napa | 55 | 0 | 0 |
| Rancho La Jota | County of Napa | 50 | 0 | 0 |
| Linda Vista Mutual Water Co | County of Napa | 50 | 0 | 0 |
| Frank Family Vineyards | County of Napa | 50 | 0 | 0 |
| Mumm Of Napa Valley | County of Napa | 50 | 0 | 0 |
| Phelps Vineyards | County of Napa | 50 | 0 | 0 |
| Napa Valley Marina | County of Napa | 50 | 0 | 0 |
| Chevron Service | County of Napa | 50 | 0 | 0 |
| Sunrise Montessori School | County of Napa | 50 | 0 | 0 |
| Wooden Valley School | County of Napa | 50 | 0 | 0 |
| Schramsberg Winery | County of Napa | 50 | 0 | 0 |
| Vineland Mobilehome Park | County of Napa | 50 | 0 | 0 |
| Heitz Wine Cellar | County of Napa | 50 | 0 | 0 |
| Phelps, Joseph Winery | County of Napa | 50 | 0 | 0 |
| Rutherford Hill | County of Napa | 50 | 0 | 0 |
| Christian Brothers | County of Napa | 50 | 0 | 0 |
| Nichelini Winery | County of Napa | 50 | 0 | 0 |
| Lokoya Mt Lodge | County of Napa | 50 | 0 | 0 |
| French Wine Embassy, Inc | County of Napa | 50 | 0 | 0 |
| Chappellet Winery | County of Napa | 49 | 0 | 0 |
| V. Sattui Winery | County of Napa | 45 | 0 | 0 |
| Groth Vineyards & Winery | County of Napa | 45 | 0 | 0 |
| Dba Silver Rose Cellars | County of Napa | 45 | 0 | 0 |
| Sharon S Water System | County of Napa | 45 | 0 | 0 |
| Viniferh Development Labor Cam | County of Napa | 45 | 0 | 0 |
| Stag S Leap Wine Cellars | County of Napa | 40 | 0 | 0 |
| St. Supery Winery | County of Napa | 40 | 0 | 0 |
| Cal Fire Sonoma-lake-napa Unit Hq | County of Napa | 40 | 0 | 0 |
| Calistoga Cottages | County of Napa | 40 | 0 | 0 |
| Pine Knoll Mutual Water Co | County of Napa | 40 | 0 | 0 |
| Heritage School | County of Napa | 40 | 0 | 0 |
| Souverain Cellars, Inc | County of Napa | 40 | 0 | 0 |
| Linda Falls Terrace Mutual | County of Napa | 35 | 0 | 0 |
| Stags Leap Winery | County of Napa | 32 | 0 | 0 |
| Carneros Inn | County of Napa | 30 | 0 | 0 |
| Rutherford Hill Winery | County of Napa | 30 | 0 | 0 |
| Far Niente Winery | County of Napa | 30 | 0 | 0 |
| Espinoza Water System | County of Napa | 30 | 0 | 0 |
| Bentley Homes | County of Napa | 30 | 0 | 0 |
| Glass Mt Trailer Park | County of Napa | 30 | 0 | 0 |
| Breezy Resort | County of Napa | 30 | 0 | 0 |
| Wispering Oaks Apts. | County of Napa | 30 | 0 | 0 |
| State Highway Maint Yard | County of Napa | 30 | 0 | 0 |
| Pacific Gas And Electric Co | County of Napa | 30 | 0 | 0 |
| Dakota Shy Winery | County of Napa | 30 | 0 | 0 |
| Pope Valley School | County of Napa | 30 | 0 | 0 |
| Monticello School | County of Napa | 30 | 0 | 0 |
| Capell Valley School | County of Napa | 30 | 0 | 0 |
| Frank L Wood | County of Napa | 30 | 0 | 0 |
| . | County of Napa | 30 | 0 | 0 |
| Napa Valley Farm And Ranch Com | County of Napa | 30 | 0 | 0 |
| Cyril E Saviez Labor Camp | County of Napa | 30 | 0 | 0 |
| Camp Kilowana | County of Napa | 30 | 0 | 0 |
| R Ranch At The Lake | County of Napa | 28 | 0 | 0 |
| Lmr Main Street Partners Llc | County of Napa | 26 | 0 | 0 |
| Maxville Lake Winery | County of Napa | 25 | 0 | 0 |
| Staglin Family Vineyards | County of Napa | 25 | 0 | 0 |
| Somerston Winery | County of Napa | 25 | 0 | 0 |
| Luna Vineyards | County of Napa | 25 | 0 | 0 |
| Odette Water System | County of Napa | 25 | 0 | 0 |
| Artesa Vineyards & Winery | County of Napa | 25 | 0 | 0 |
| Hunnicutt Winery | County of Napa | 25 | 0 | 0 |
| Darioush Winery | County of Napa | 25 | 0 | 0 |
| Mayacamas Vineyards | County of Napa | 25 | 0 | 0 |
| Mending Wall Winery | County of Napa | 25 | 0 | 0 |
| Marciano Winery | County of Napa | 25 | 0 | 0 |
| Wheeler Farms Winery | County of Napa | 25 | 0 | 0 |
| Outpost Wines | County of Napa | 25 | 0 | 0 |
| Fairwinds Estate Winery | County of Napa | 25 | 0 | 0 |
| Nine Suns Winery | St. Helena | 25 | 0 | 0 |
| Twomey Cellars | County of Napa | 25 | 0 | 0 |
| Calistoga Ranch | County of Napa | 25 | 0 | 0 |
| Las Posadas 4-h Camp | County of Napa | 25 | 0 | 0 |
| Peju Province | County of Napa | 25 | 0 | 0 |
| Vailima Estates Mutual Water | County of Napa | 25 | 0 | 0 |
| Turtle Rock | County of Napa | 25 | 0 | 0 |
| Schramsberg Winery | County of Napa | 25 | 0 | 0 |
| Jarvis Vineyard | County of Napa | 25 | 0 | 0 |
| Rutherford Grove Winery | County of Napa | 25 | 0 | 0 |
| Miner Family Winery | County of Napa | 25 | 0 | 0 |
| Golden Haven Motel | County of Napa | 25 | 0 | 0 |
| Liana Estate | County of Napa | 25 | 0 | 0 |
| Di Rosa Art Preserve | County of Napa | 25 | 0 | 0 |
| Laird Family Estate | County of Napa | 25 | 0 | 0 |
| Duckhorn Vineyards | County of Napa | 25 | 0 | 0 |
| Nickel & Nickel Winery | County of Napa | 25 | 0 | 0 |
| Etude Wines | County of Napa | 25 | 0 | 0 |
| Cade Winery | County of Napa | 25 | 0 | 0 |
| Pleasure Cove Resort | County of Napa | 25 | 0 | 0 |
| Davis Estates | County of Napa | 25 | 0 | 0 |
| Markham Vineyards | County of Napa | 25 | 0 | 0 |
| Pickett Road Wine Company | County of Napa | 25 | 0 | 0 |
| B Cellars Winery | County of Napa | 25 | 0 | 0 |
| Oakville Grade Winery | County of Napa | 25 | 0 | 0 |
| Professional Center Of St Helena | County of Napa | 25 | 0 | 0 |
| Upper Valley Disposal Service | County of Napa | 25 | 0 | 0 |
| Cuvaison Carneros | County of Napa | 25 | 0 | 0 |
| Vineyard 7 & 8 | County of Napa | 25 | 0 | 0 |
| Ehlers Estate | County of Napa | 25 | 0 | 0 |
| William Hill Winery | County of Napa | 25 | 0 | 0 |
| 11:11 | County of Napa | 25 | 0 | 0 |
| Alpha Omega Winery | County of Napa | 25 | 0 | 0 |
| Grgich Hills | County of Napa | 25 | 0 | 0 |
| Broken Hill 1 Llc | County of Napa | 25 | 0 | 0 |
| Sequoia Grove Vineyards | County of Napa | 25 | 0 | 0 |
| Italics Winery | County of Napa | 25 | 0 | 0 |
| St. Helena Purlieu Llc | County of Napa | 25 | 0 | 0 |
| Cairdean Winery | County of Napa | 25 | 0 | 0 |
| Camp Berryessa | County of Napa | 25 | 0 | 0 |
| Z D WINES | County of Napa | 25 | 0 | 0 |
| Dana Estates | County of Napa | 25 | 0 | 0 |
| Hagafen Cellars | County of Napa | 25 | 0 | 0 |
| Larkmead Vineyards | County of Napa | 25 | 0 | 0 |
| Napa Valley Reserve Water System | County of Napa | 25 | 0 | 0 |
| Envy Wines | County of Napa | 25 | 0 | 0 |
| Lokoya Winery | County of Napa | 25 | 0 | 0 |
| Trinchero Winery | County of Napa | 25 | 0 | 0 |
| O Shaughnessy Winery | County of Napa | 25 | 0 | 0 |
| Castello Di Amorosa | County of Napa | 25 | 0 | 0 |
| Kenzo Winery | County of Napa | 25 | 0 | 0 |
| Dominus Estate Winery | County of Napa | 25 | 0 | 0 |
| Silenus Vintners | County of Napa | 25 | 0 | 0 |
| Honig Winery | County of Napa | 25 | 0 | 0 |
| Black Stallion Winery | County of Napa | 25 | 0 | 0 |
| Cosentino Winery | County of Napa | 25 | 0 | 0 |
| Domaine Carneros | County of Napa | 25 | 0 | 0 |
| Foley Johnson Winery | County of Napa | 25 | 0 | 0 |
| Gamble Winery | County of Napa | 25 | 0 | 0 |
| Signorello Winery | County of Napa | 25 | 0 | 0 |
| Joseph Cellars | County of Napa | 25 | 0 | 0 |
| Del Dotto Winery | County of Napa | 25 | 0 | 0 |
| Hartwell Winery | County of Napa | 25 | 0 | 0 |
| Culinary Institute Of America | County of Napa | 25 | 0 | 0 |
| Rexford Mobile Home Estates | County of Napa | 25 | 0 | 0 |
| Castle Trove, Inc. | County of Napa | 25 | 0 | 0 |
| Jerry's Market | County of Napa | 25 | 0 | 0 |
| Ashes & Diamonds Winery | County of Napa | 25 | 0 | 0 |
| Merryvale Vineyards | County of Napa | 25 | 0 | 0 |
| Mt La Salle Vineyards | County of Napa | 25 | 0 | 0 |
| Strack W.d. Water | County of Napa | 25 | 0 | 0 |
| Stags Leap Winery | County of Napa | 25 | 0 | 0 |
| Pelissa And Hale | County of Napa | 25 | 0 | 0 |
| Arco Service | County of Napa | 25 | 0 | 0 |
| August Briggs Winery | County of Napa | 25 | 0 | 0 |
| Robert Mondavi Labor Camp | County of Napa | 25 | 0 | 0 |
| Napa County Maintenance Yard | County of Napa | 25 | 0 | 0 |
| Victor Grusdiv | County of Napa | 25 | 0 | 0 |
| Valley Market | County of Napa | 25 | 0 | 0 |
| Goosecross Cellars | County of Napa | 25 | 0 | 0 |
| Rainbow Ranch | County of Napa | 25 | 0 | 0 |
| Frogs Leap Winery | County of Napa | 25 | 0 | 0 |
| Fantesca Winery | County of Napa | 25 | 0 | 0 |
| Kathryn Hall Winery | County of Napa | 25 | 0 | 0 |
| Palmaz Vineyards | County of Napa | 24 | 0 | 0 |
| Vineyard 29 | County of Napa | 24 | 0 | 0 |
| Jackson Family Investments Water System | County of Napa | 24 | 0 | 0 |
| Round Pond Estate Winery Llc | County of Napa | 24 | 0 | 0 |
| Napa Co Maintenance Yard | County of Napa | 20 | 0 | 0 |
| California State Division Of F | County of Napa | 20 | 0 | 0 |
| Donald E Chaix | County of Napa | 20 | 0 | 0 |
| Galleron Brothers | County of Napa | 20 | 0 | 0 |
| Spring Mt Rd Hi-way Spring | County of Napa | 20 | 0 | 0 |
| Draper And Culbertson | County of Napa | 20 | 0 | 0 |
| Howell Mt Rd Hi-way Spring | County of Napa | 20 | 0 | 0 |
| Emmolo Nursery | County of Napa | 20 | 0 | 0 |
| Mund S Mobile Home Park | County of Napa | 20 | 0 | 0 |
| Phillip Doub | County of Napa | 20 | 0 | 0 |
| Same | County of Napa | 20 | 0 | 0 |
| Woodland Ridge Mutual Water Co | County of Napa | 18 | 0 | 0 |
| L And M Martini | County of Napa | 18 | 0 | 0 |
| Cannon Park Water Co. | County of Napa | 16 | 0 | 0 |
| Glass Mtn Trailer Park | County of Napa | 15 | 0 | 0 |
| Napa State Hospital-camp Coombs | County of Napa | 15 | 0 | 0 |
| Stonegate Winery | County of Napa | 15 | 0 | 0 |
| Silver Pony School | County of Napa | 15 | 0 | 0 |
| Calplans Farms | County of Napa | 12 | 0 | 0 |
| Mapes Heights Mutual Water Co | County of Napa | 10 | 0 | 0 |
| Pacific Gas And Electric Co | County of Napa | 10 | 0 | 0 |
| Mucho Dinero Aqua Cia Water | County of Napa | 10 | 0 | 0 |
| YORK CREEK VINEYARDS | County of Napa | 10 | 0 | 0 |
| Chateau Chevalier | County of Napa | 10 | 0 | 0 |
| D E Battuello | County of Napa | 10 | 0 | 0 |
| Pope Valley Winery | County of Napa | 10 | 0 | 0 |
| Trefthen Ranch Labor Camp | County of Napa | 10 | 0 | 0 |
| Third Avenue Grocery | County of Napa | 8 | 0 | 0 |
| Gerald Mcclaine | County of Napa | 7 | 0 | 0 |
| Carneros Creek Winery | County of Napa | 6 | 0 | 0 |
| Chapellet Winery | County of Napa | 5 | 0 | 0 |
| Vine Village | County of Napa | 3 | 0 | 0 |
| Hanns Kornell Winery | County of Napa | 1 | 0 | 0 |
| Sheveland Apartments | County of Napa | 1 | 0 | 0 |
| Napa Valley Vineyard Co | County of Napa | 1 | 0 | 0 |
| Rancho Monticello Resort | County of Napa | 0 | 0 | 0 |
| Lakeside Market | County of Napa | 0 | 0 | 0 |