Tapcensus

Water quality in Rohnert Park, California

Rohnert Park 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

Rohnert Park, City of CA4910014 · Community water system · Ground water · Rohnert Park
Serves 43,821 people Rules violated, past 3 years 0 Last sanitary survey Nov 19, 2025 Distance under 0.1 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 Sonoma County

128 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Sonoma State University
 1,500 0 1.4 mi
Canon Manor Water System
 828 0 1.9 mi
Cotati, City of
Cotati		 7,290 0 2.1 mi
Madrone Mutual Water Company
 76 0 2.1 mi
Sonoma Mountain County Water District
 185 0 3.0 mi
Penngrove Water Company (puc)
 1,742 0 3.1 mi
Santa Rosa Mobile Estates
 420 0 3.2 mi
Delores Lane Water System
 54 0 3.3 mi
Plaza Mobile Home Park
 169 1 3.4 mi
Western Mobile Home Park
 178 1 3.5 mi
North Star Mobile Home Park
 221 0 3.6 mi
Happy Acres Mutual Benefit Water System
 260 0 3.7 mi
Robin Way Water System
 66 0 3.9 mi
Wendell Lane Mutual Water Company
 82 0 3.9 mi
Summit View Ranch Mutual Water Co.
 45 0 3.9 mi
EL Portal Mobile Estates
 344 1 3.9 mi
Sunset Park Community
 157 1 4.1 mi
College Park Mutual Water Company
 244 1 4.1 mi
Mountain View Mobile Estates, LLC
 250 0 4.2 mi
Lichau Hylands Mutual Water Company
 56 0 4.7 mi
Terrace View Water System
 60 0 5.1 mi
Hawkins Water Co-Cal Water Service (puc)
 91 0 5.1 mi
Branger Mutual Water Company, Inc.
 300 1 5.2 mi
James Court Water System
 208 1 5.2 mi
Yulupa Mutual Water Company
 200 0 5.5 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
Stripe N Seal
 26 0 0
Jehovah's Witnesses Hall
 650 0 0
Friedman Brothers Hardware
 95 0 0
7180 Hwy 116 LLC
 57 1 0
Truck Tops USA
Santa Rosa 		40 0 0
United Rentals
 35 0 0
Washoe House
 75 0 0
Santa Rosa Liquor and Deli
 95 0 0
Karah Estate Winery
 27 1 1
LA Hacienda del Toro
 58 0 0
Michael Ellis School for Dog Trainers
 31 0 0
Dunham School
 175 1 1
Bellevue Union Sch Dist-Bellevue School
 380 0 0
Saints Peter & Paul Russian Church
 25 0 0
Sonoma County Pub Works-Central Landfill
 34 1 1
Hessel Church
 116 0 0
Liberty School
 225 0 0
Gravenstein School District-Gravenstein
 398 1 1
Matanzas Creek Winery
 139 0 0
KOA Petaluma
 713 0 0
Gravenstein Business Park
 50 0 0
Sonoma State U.-Fairfield Osborn Pres
 151 0 0
Sonoma Wine Shop
 25 0 0
Midgley's Country Flea Market
 100 0 0
Fritsch Industrial Park
 36 0 0
Gravenstein School District-Hillcrest
 289 1 1
Michael Lucas Water System
 25 0 0
Willowbrook Ale House
 50 0 0
Westside Storage Water System
 77 0 0
Jjapt Bloomfield
 37 0 0
Seneca Family of Agencies
 30 1 1
Petaluma Livestock Auction Yard
 100 0 0
Lombardi's Deli & Bbq
 300 0 0
Cinnabar Elementary School
 228 0 0
Jan Klebe
 101 0 0
Sonoma Mountain Zen Center
 33 0 0
Sonoma West Holdings Industrial Park
 25 0 0
Sequoia Water Company
 100 0 0
Humane Society of Sonoma County
 27 0 0
LA Cantera Racquet Club
 75 1 0
Csp-Jack London State Historic Park
 130 0 0
Twin Hills Vineyard
 50 0 0
Twin Hills School Dist-Twin Hills School
 400 0 0
Adobe Christian Church
 50 0 0
Balletto Vineyards
 42 0 0
Santa Rosa Golf & Country Club
 250 0 0
Valley of the Moon Plaza Shopping Center
 100 0 0
Benziger Family Winery
 25 0 0
Sugarloaf Water System
 42 0 0
Oak Grove School District Office
 36 0 0
All non-community systems
About this data

Water systems are matched to Sonoma County, nearest to Rohnert Park 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.