Tapcensus

Water quality for ZIP code 94515

ZIP 94515 covers Calistoga in Sonoma County, California, one of 38 ZIP codes in the county. 445 active public water systems serve the county; 76 had an EPA violation in the past three years.

Most likely your provider

Loch Haven Mutual Water Company CA4900575 · Community water system · Ground water
Serves 26 people Rules violated, past 3 years 0 Last sanitary survey Nov 21, 2023 Distance 7.6 mi
View system details EPA facility report

Other community water systems in Sonoma County

128 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Heights Mutual Water Company
 363 0 9.1 mi
Wilshire Heights Mutual Water Company
 70 0 9.6 mi
Mark West Meadows Mutual Water
 31 1 9.7 mi
Rolling Oaks Road Association
 25 0 9.8 mi
Mark West Acres Mwc
 61 0 10.1 mi
Michele Mutual Water Company
 93 0 10.1 mi
Riebli Mutual Water Company
 150 0 10.4 mi
Alexander Valley Acres Water Company
 27 0 10.6 mi
Randal's Ranchette Mutual Water Company
 93 2 10.9 mi
End-O-Valley Mutual Water Company
 129 1 11.0 mi
Shamrock Mobile Home Park
 188 1 11.5 mi
Windsor, Town of
 25,561 0 11.5 mi
California-American Larkfield (puc)
 7,911 0 11.6 mi
Mobile Home Estates
 403 2 11.8 mi
Colonial Park
 342 0 11.8 mi
Rio Lindo Adventist Academy
 178 0 12.2 mi
Sonoma County Csa 41-Fitch Mountain
 1,115 1 12.2 mi
Rincon Valley Mobile Estates
 460 1 12.3 mi
Stonegate Mobile Home Park
 196 0 12.3 mi
Evergreen Mobile Estates
 65 0 12.4 mi
Brand Water Company
 112 0 12.5 mi
Melita Heights Mutual Water Company
 64 2 12.6 mi
Russian River Mutual Water Co.
 87 0 12.8 mi
Healdsburg, City of
Healdsburg		 10,972 0 13.6 mi
Santa Rosa, City of
Santa Rosa		 178,452 0 13.7 mi
All 129 community water systems in Sonoma County
Non-community systems in Sonoma County (316: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Triple S Ranch
 130 0 0
Hans Fahden Vineyards
 87 1 0
Petrified Forest
 304 0 0
Pepperwood Environmental Center
 35 0 0
Urj Camp Newman
 705 0 0
Safari West
 99 0 0
Verite Winery
 38 0 0
Field Stone Winery
 27 0 0
Lancaster Estate Winery
 46 0 0
Hanna Vineyards
 31 0 0
Chalk Hill Winery
 25 0 0
Hoot Owl Creek/alex. Valley Vineyards JV
 46 1 0
Alexander Valley Union School District
 200 0 0
Roth Winery
 25 0 0
Stuhlmuller Vineyards
 61 0 0
Soda Rock Winery
 50 0 0
Mauritson Labor House
 37 0 0
Silver Oak Wine Cellars LLC
 33 0 0
Stonestreet Winery
 55 0 0
Hawkes Winery
 30 0 0
Jimtown and Then Sum
 35 0 0
Alexander Valley Store & Bar
 27 0 0
Paradise Ridge Winery
 35 0 0
Starlite Winery
 101 0 0
Cloverleaf Ranch Summer Camp
 100 0 0
Calpine (geysers Administration Center)
 150 0 0
Robert Young Family Limited Partner
 28 0 0
Sutter Santa Rosa Regional Hospital
 1,000 0 0
Kendall-Jackson Wine Center
 45 0 0
Valley of the Moon Plaza Shopping Center
 100 0 0
Foley Sonoma Winery
 59 0 0
Merriam Winery
 50 0 0
Jordan Vineyard & Winery
 50 0 0
J Vineyards & Winery
 50 0 0
LA Cantera Racquet Club
 75 1 0
Sugarloaf Water System
 42 0 0
Vino Farms, Inc. Wasson Ranch
 35 0 0
Capital Lumber Company
 50 0 0
Foppiano Vineyards
 25 0 0
Rodney Strong Vineyards
 150 0 0
Rack & Riddle Custom Wine Services
 61 0 0
Aperture Cellars
 33 0 0
Sonoma County Parks-Vet. Memorial Beach
 252 0 0
Vino Farms, Inc. Preston Ranch
 72 0 0
Ledson Winery and Vineyards
 128 0 0
Nalle Winery
Healdsburg 		29 0 0
Saint Francis Winery-Wild Oak Vineyards
 50 0 0
Bricoleur Vineyards
 57 0 0
Orsi Family Vineyards
 26 0 0
LA Crema Winery
 75 0 0
All non-community systems
About this data

Water systems are matched to Sonoma 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.