Tapcensus

Water quality in Oakville, California

Oakville is in Napa County. 188 active public water systems serve the county; 56 had an EPA violation in the past three years.

Most likely your provider

Napa, City of CA2810003 · Community water system · Surface water · Napa
Serves 84,804 people Rules violated, past 3 years 0 Distance 10.9 mi

Your location is within the outer bounds of this system's EPA service area.

View system details EPA facility report

Other community water systems in Napa County

27 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Town of Yountville
 2,785 0 3.7 mi
Veterans Home of California
 1,000 1 3.8 mi
River Ranch Farm Worker Center
 66 0 4.7 mi
Mondavi Farm Worker Center
 66 0 5.1 mi
St. Helena, City of
St. Helena		 5,386 2 5.6 mi
Hess Winery
 100 2 7.1 mi
Vailima Estates Mutual Water
 25 0 7.8 mi
Adventist Health St. Helena Hospital
 617 0 8.1 mi
Linda Vista Mutual Water CO
 90 0 8.1 mi
Linda Falls Terrace Mutual
 35 0 8.4 mi
LA Tierra Heights Mutual
 67 2 8.7 mi
Howell Mountain Mutual Water Company
 1,244 0 9.2 mi
R Ranch at the Lake
 20 2 9.4 mi
Pacific Union College
 758 0 9.4 mi
Tucker Acres Mutual Water Co.
 200 1 10.4 mi
Circle Oaks Water District
 500 0 10.7 mi
Calistoga Farm Worker Center
 67 0 10.9 mi
Capell Valley Estates
 208 2 11.4 mi
Spanish Flat Water District
 92 2 11.7 mi
Berryessa Highlands
 715 1 13.0 mi
Berryessa Pines Water System
 261 2 13.6 mi
Calistoga, City of
Calistoga		 5,610 2 14.2 mi
Napa River Ranch
 70 5 15.5 mi
Milton Road Water Company
 39 1 16.5 mi
Meyers Water Co.
 250 1 17.1 mi
All 28 community water systems in Napa County
Non-community systems in Napa County (160: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Opus One Winery
 100 0 0
Cakebread Cellar
 100 0 0
One Hope Winery
Napa 		85 0 0
Sequoia Grove Vineyards
 25 1 1
Foley Johnson Winery
 37 0 0
Cardinale Estate
 48 0 0
Staglin Family Vineyard
 25 0 0
St. Supery Winery
 40 0 0
Promontory Winery
 38 0 0
Silver Oak Wine Cellars
 167 1 1
Gamble Family Vineyards Winery
 40 0 0
Peju Province
 27 1 1
Piazza Winery
 99 0 0
Gene Wines LLC
 38 0 0
Groth Vineyards & Winery
 65 0 0
B Cellars Winery
 52 0 0
Grgich Hills
 25 0 0
Honig Winery
 38 0 0
Frogs Leap Winery
 25 0 0
Alpha Omega Winery
 25 0 0
Z D Wines
 95 0 0
Caymus Vineyards
 42 1 0
Rudd Wines, Inc., Dba Rudd
 100 0 0
Bella Union Winery
 238 1 0
Miner Family Winery
 25 0 0
Mumm of Napa Valley
 50 0 0
Pestoni Family Estate Winery
 26 0 0
Tpwc Dba the Prisoner Wine Company
 200 0 0
Upper Valley Disposal Service
 52 0 0
Dominus Estate Winery
 39 0 0
Goosecross Cellars
 25 1 0
Whitehall Lane Winery
 45 0 0
Raymond Vineyard & Cellar
 90 1 1
Stags Leap Wine Cellars North
 64 0 0
Dakota Shy Winery
 58 1 0
Quintessa Winery Water System
St. Helena 		33 0 0
Domaine Carneros
 52 0 0
Del Dotto Winery
 27 0 0
Round Hill Winery
 100 0 0
Nine Suns Winery
St. Helena 		25 0 0
The Ranch Winery
 200 1 1
William Hill Winery
 25 1 0
Lewis Cellars
 293 0 0
Rutherford Hill Winery
 30 2 1
Kathryn Hall Winery
 28 0 0
Wheeler Farms Winery
 43 0 0
Cathiard Family Estate Winery
 75 0 0
Milat Winery
 128 0 0
Rutherford Hill Mutual Water
 232 0 0
Baldacci Family Vineyards
Napa 		85 0 0
All non-community systems
About this data

Water systems are matched to Napa County, nearest to Oakville first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.

Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.

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.