Tapcensus

Water quality for ZIP code 94599

ZIP 94599 covers Yountville in Napa County, California, one of 10 ZIP codes in the county. 188 active public water systems serve the county; 56 had an EPA violation in the past three years.

Most likely your provider

Town of Yountville CA2810007 · Community water system · Surface water purchased
Serves 2,785 people Rules violated, past 3 years 0 Distance 1.1 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
Veterans Home of California
 1,000 1 1.3 mi
Mondavi Farm Worker Center
 66 0 2.0 mi
Hess Winery
 100 2 5.4 mi
River Ranch Farm Worker Center
 66 0 7.5 mi
R Ranch at the Lake
 20 2 7.8 mi
Circle Oaks Water District
 500 0 8.0 mi
Napa, City of
Napa		 84,804 0 8.1 mi
St. Helena, City of
St. Helena		 5,386 2 8.7 mi
Capell Valley Estates
 208 2 9.2 mi
Vailima Estates Mutual Water
 25 0 10.8 mi
Linda Vista Mutual Water CO
 90 0 10.8 mi
Adventist Health St. Helena Hospital
 617 0 11.0 mi
Spanish Flat Water District
 92 2 11.0 mi
Linda Falls Terrace Mutual
 35 0 11.1 mi
LA Tierra Heights Mutual
 67 2 11.4 mi
Berryessa Highlands
 715 1 11.8 mi
Howell Mountain Mutual Water Company
 1,244 0 11.8 mi
Pacific Union College
 758 0 11.9 mi
Napa River Ranch
 70 5 12.9 mi
Tucker Acres Mutual Water Co.
 200 1 13.5 mi
Calistoga Farm Worker Center
 67 0 13.9 mi
Milton Road Water Company
 39 1 14.0 mi
Berryessa Pines Water System
 261 2 14.2 mi
Meyers Water Co.
 250 1 14.7 mi
American Canyon, City of
American Canyon		 18,423 1 15.9 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
Dominus Estate Winery
 39 0 0
Domaine Carneros
 52 0 0
Goosecross Cellars
 25 1 0
Baldacci Family Vineyards
Napa 		85 0 0
Pine Ridge Winery
 75 1 0
Lewis Cellars
 293 0 0
Piazza Winery
 99 0 0
Gene Wines LLC
 38 0 0
Bell Wine Cellars
Napa 		208 0 0
The Barrel Chai
 25 0 0
Odette Estate Water System
 25 0 0
Gamble Family Vineyards Winery
 40 0 0
Stags Leap Winery
 50 0 0
Cardinale Estate
 48 0 0
Silver Oak Wine Cellars
 167 1 1
Stags Leap Wine Cellars
 44 0 0
B Cellars Winery
 52 0 0
Opus One Winery
 100 0 0
Groth Vineyards & Winery
 65 0 0
Promontory Winery
 38 0 0
Clos DU Val Wine Co.
 100 0 0
Rudd Wines, Inc., Dba Rudd
 100 0 0
Silenus Vintners
 25 1 0
Cakebread Cellar
 100 0 0
Miner Family Winery
 25 0 0
Antinori California
Napa 		25 1 0
Ovid Napa Valley
St. Helena 		35 0 0
Sequoia Grove Vineyards
 25 1 1
Nine Suns Winery
St. Helena 		25 0 0
One Hope Winery
Napa 		85 0 0
Foley Johnson Winery
 37 0 0
St. Supery Winery
 40 0 0
Laird Family Estate
 55 2 1
Staglin Family Vineyard
 25 0 0
Peju Province
 27 1 1
Enchanted Hills
 146 0 0
Materra Winery
 49 0 0
Signorello Winery
 25 0 0
Z D Wines
 95 0 0
Caymus Vineyards
 42 1 0
Darioush Winery
 40 1 1
Frogs Leap Winery
 25 0 0
Mayacamas Vineyards
 38 0 0
Mumm of Napa Valley
 50 0 0
Honig Winery
 38 0 0
Woolls Ranch Winery
 73 0 0
Chappellet Winery
 49 0 0
Ashes & Diamonds Winery
 25 0 0
Black Stallion Winery
 45 0 0
Grgich Hills
 25 0 0
All non-community systems
About this data

Water systems are matched to Napa County, the county this ZIP code lies in, nearest to the ZIP code's centre 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.

ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.