Tapcensus

Water quality in Larkfield-Wikiup, California

Larkfield-Wikiup is in Sonoma County. 445 active public water systems serve the county; 76 had an EPA violation in the past three years.

Most likely your provider

California-American Larkfield (puc) CA4910023 · Community water system · Ground water
Serves 7,911 people Rules violated, past 3 years 0 Last sanitary survey Mar 11, 2026 Distance 0.5 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 Sonoma County

128 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Stonegate Mobile Home Park
 196 0 1.3 mi
Colonial Park
 342 0 1.3 mi
Mobile Home Estates
 403 2 1.4 mi
Michele Mutual Water Company
 93 0 1.8 mi
Mark West Meadows Mutual Water
 31 1 1.8 mi
Mark West Acres Mwc
 61 0 2.0 mi
Wilshire Heights Mutual Water Company
 70 0 2.3 mi
Shamrock Mobile Home Park
 188 1 2.4 mi
Riebli Mutual Water Company
 150 0 2.9 mi
Windsor, Town of
 25,561 0 2.9 mi
Heights Mutual Water Company
 363 0 3.5 mi
Loch Haven Mutual Water Company
 26 0 3.6 mi
Rolling Oaks Road Association
 25 0 4.3 mi
End-O-Valley Mutual Water Company
 129 1 4.3 mi
Randal's Ranchette Mutual Water Company
 93 2 4.7 mi
Evergreen Mobile Estates
 65 0 5.1 mi
Park Royal Mutual Water Company
 75 0 5.3 mi
Crystals
Santa Rosa		 48 0 5.3 mi
Santa Rosa, City of
Santa Rosa		 178,452 0 5.3 mi
Athena Terrace Mutual Water Company
 47 0 5.6 mi
Rincon Valley Mobile Estates
 460 1 5.6 mi
Leisure Mobile Home Park
 410 0 5.7 mi
Roseland Mobile Home Park
 130 0 5.8 mi
Willowside Mutual Water Company
 528 0 6.0 mi
Vinehill Vistas Mutual Water Company
 37 0 6.0 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
Kendall-Jackson Wine Center
 45 0 0
Sutter Santa Rosa Regional Hospital
 1,000 0 0
Paradise Ridge Winery
 35 0 0
Cloverleaf Ranch Summer Camp
 100 0 0
LA Crema Winery
 75 0 0
Northwest Prep Charter School
 325 1 0
Martinelli Ranch
 52 0 0
Chalk Hill Winery
 25 0 0
Bricoleur Vineyards
 57 0 0
Safari West
 99 0 0
Roth Winery
 25 0 0
Hook & Ladder Vineyards and Winery
 35 0 0
Saralee's Vineyard and Tasting Room
 84 0 0
Olivet Elementary School
 400 2 2
Sunce Winery
 26 0 0
Campobello
 45 0 0
Gray Water System
 50 0 0
Urj Camp Newman
 705 0 0
Boisset de Loach Winery
 33 0 0
Copain Wine Cellars
 26 0 0
Pepperwood Environmental Center
 35 0 0
Summerfield Waldorf School
 301 0 0
Spider Web Ranch
 38 0 0
Fritsch Industrial Park
 36 0 0
Sonoma County Parks-Riverfront Park
 50 0 0
Willowside School
 460 1 1
Oak Grove School District Office
 36 0 0
Childkind Laguna Preschool
 42 0 0
LA Cantera Racquet Club
 75 1 0
Vino Farms, Inc. Preston Ranch
 72 0 0
Michael Lucas Water System
 25 0 0
Gracianna Winery
 64 0 0
Russian River Winery
 73 0 0
Rochioli Winery
 26 0 0
Santa Rosa Golf & Country Club
 250 0 0
Williams Selyem Winery
 25 0 0
Chaos Vineyards, Llc.
 50 0 0
J Vineyards & Winery
 50 0 0
Merriam Winery
 50 0 0
Hop Kiln Winery
 150 0 0
Rodney Strong Vineyards
 150 0 0
Petrified Forest
 304 0 0
Thomas George Estates Winery
 25 0 0
Lynmar Winery
 100 0 0
Macrostie Winery and Vineyard
 150 0 0
Aperture Cellars
 33 0 0
Verite Winery
 38 0 0
Triple S Ranch
 130 0 0
Humane Society of Sonoma County
 27 0 0
Bucher Water Company
 52 1 1
All non-community systems
About this data

Water systems are matched to Sonoma County, nearest to Larkfield-Wikiup 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.