Tapcensus

California

Napa County drinking water quality

188 active public water systems serve 136,576 people in Napa County. 132 are compliant, 56 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 24 carry a health flag.

Active systems 188 28 community systems
People served 137K by public water systems
Systems with violations 56 30% of active systems, past 3 years
Serious violators 1 24 systems carry a health flag

Needs attention

Capell Valley Estates CA2800543 · Community water system · Serves 208 2 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Veterans Home of California CA2810008 · Community water system · Serves 1,000 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Napa Valley Country Club CA2800588 · Non-Transient non-community system · Serves 400 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Berryessa Pines Water System CA2810009 · Community water system · Serves 261 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Domaine Chandon CA2800736 · Non-Transient non-community system · Serves 200 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Silver Oak Wine Cellars CA2801038 · Non-Transient non-community system · Serves 167 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Hess Winery CA2801016 · Community water system · Serves 100 2 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Howell Mountain School CA2800970 · Non-Transient non-community system · Serves 100 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Castello DI Amorosa CA2800043 · Non-Transient non-community system · Serves 98 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Spanish Flat Water District CA2810014 · Community water system · Serves 92 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).

14 more systems with a serious violator or health flag designation are in the lists below.

Community water systems

28 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Napa, City of
Napa 		84,804 0 0
American Canyon, City of
American Canyon 		18,423 1 1
Calistoga, City of
Calistoga 		5,610 2 1
St. Helena, City of
St. Helena 		5,386 2 1
Town of Yountville
 2,785 0 0
Howell Mountain Mutual Water Company
 1,244 0 0
Veterans Home of California
 1,000 1 1
Pacific Union College
 758 0 0
Berryessa Highlands
 715 1 0
Adventist Health St. Helena Hospital
 617 0 0
Circle Oaks Water District
 500 0 0
Berryessa Estates (lbrid)
 474 0 0
Berryessa Pines Water System
 261 2 1
Meyers Water Co.
 250 1 0
Capell Valley Estates
 208 2 2
Tucker Acres Mutual Water Co.
 200 1 1
Hess Winery
 100 2 1
Spanish Flat Water District
 92 2 1
Linda Vista Mutual Water CO
 90 0 0
Napa River Ranch
 70 5 3
Calistoga Farm Worker Center
 67 0 0
LA Tierra Heights Mutual
 67 2 1
Mondavi Farm Worker Center
 66 0 0
River Ranch Farm Worker Center
 66 0 0
Milton Road Water Company
 39 1 1
Linda Falls Terrace Mutual
 35 0 0
Vailima Estates Mutual Water
 25 0 0
R Ranch at the Lake
 20 2 1
Non-community systems (160: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Csp-Bothe-Napa Valley State Park
 586 0 0
Hillside Christian Center Water System
 507 0 0
Sterling Vineyards
 500 0 0
Napa Valley Country Club
 400 1 1
Beringer Vineyards
 300 0 0
Lewis Cellars
 293 0 0
Nvusd: Stonebridge School
 266 0 0
Trinchero Winery
 263 0 0
Sutter Home Winery
 244 0 0
Bella Union Winery
 238 1 0
Rutherford Hill Mutual Water
 232 0 0
Bell Wine Cellars
Napa 		208 0 0
Domaine Chandon
 200 2 1
Putah Canyon Campground
 200 0 0
The Ranch Winery
 200 1 1
Tpwc Dba the Prisoner Wine Company
 200 0 0
Welcome Grange Hall
 200 1 0
Csp Bale Grist Mill State Historic Par
 185 0 0
Silver Oak Wine Cellars
 167 1 1
Skyline Park
 150 1 0
Enchanted Hills
 146 0 0
Syar Industries
 130 0 0
Milat Winery
 128 0 0
Chimney Rock Winery
 116 0 0
Saintsbury Winery
Napa 		109 0 0
Laird Wine Studio
 106 1 0
Pleasure Cove Resort
 106 0 0
Beaulieu Vineyard
 100 1 0
Cakebread Cellar
 100 0 0
Clos DU Val Wine Co.
 100 0 0
Duffy's Napa Valley Rehab
 100 0 0
Gene Norris Plaza
 100 0 0
Howell Mountain School
 100 1 1
Mont St. John Cellars
 100 0 0
Napa County Schools: Pope Valley
 100 0 0
Opus One Winery
 100 0 0
Round Hill Winery
 100 0 0
Rudd Wines, Inc., Dba Rudd
 100 0 0
Silverado Vineyards
 100 0 0
Piazza Winery
 99 0 0
Castello DI Amorosa
 98 1 1
Z D Wines
 95 0 0
Raymond Vineyard & Cellar
 90 1 1
Baldacci Family Vineyards
Napa 		85 0 0
One Hope Winery
Napa 		85 0 0
Davis Estates
 84 0 0
Bennett Lane Winery
Calistoga 		83 0 0
Cathiard Family Estate Winery
 75 0 0
Pine Ridge Winery
 75 1 0
Woolls Ranch Winery
 73 0 0
Cal Fire Sonoma-Lake-Napa Unit HQ
 65 0 0
Groth Vineyards & Winery
 65 0 0
Schramsberg Winery
 65 0 0
Stags Leap Wine Cellars North
 64 0 0
Titus Winery
 64 0 0
Wine Country Inn
 60 1 1
Dakota Shy Winery
 58 1 0
Phelps Vineyards
 56 0 0
Freemark Abbey Winery
 55 0 0
Laird Family Estate
 55 2 1
B Cellars Winery
 52 0 0
Domaine Carneros
 52 0 0
Upper Valley Disposal Service
 52 0 0
Mumm of Napa Valley
 50 0 0
Napa Valley Marina
 50 1 0
Rombauer Vineyards
 50 0 0
Soda Canyon Store
 50 1 0
Stags Leap Winery
 50 0 0
Chappellet Winery
 49 0 0
Golden Haven Motel
 49 0 0
Materra Winery
 49 0 0
Napa Valley Reserve Water System
 49 1 0
Reverie Winery
 49 0 0
Biale Winery
Napa 		48 0 0
Cardinale Estate
 48 0 0
Robert Keenan Winery
 48 0 0
Black Stallion Winery
 45 0 0
Clos Pegase Winery
 45 1 1
V. Sattui Winery
 45 2 1
Whitehall Lane Winery
 45 0 0
Stags Leap Wine Cellars
 44 0 0
Twomey Cellars
 43 0 0
Wheeler Farms Winery
 43 0 0
Caymus Vineyards
 42 1 0
Ehlers Estate
 42 0 0
11:11 Winery
 41 0 0
Fantesca Winery
 41 0 0
Darioush Winery
 40 1 1
Gamble Family Vineyards Winery
 40 0 0
Hudson Vineyards Winery Water System
 40 0 0
Nickel & Nickel Winery
 40 0 0
Rancho la Jota
 40 0 0
St. Supery Winery
 40 0 0
Artesa Vineyards & Winery
 39 0 0
Behrens Family Winery
 39 0 0
Dominus Estate Winery
 39 0 0
Gene Wines LLC
 38 0 0
Honig Winery
 38 0 0
Markham Vineyards
 38 0 0
Mayacamas Vineyards
 38 0 0
All 160 in the systems table
Inactive systems (178, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.