Tapcensus

Water quality in San Luis Obispo, California

San Luis Obispo is in San Luis Obispo County. 172 active public water systems serve the county; 54 had an EPA violation in the past three years.

Most likely your provider

San Luis Obispo Water Department CA4010009 · Community water system · Surface water
Serves 49,534 people Rules violated, past 3 years 0 Last sanitary survey Oct 16, 2024 Distance 0.6 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 San Luis Obispo County

71 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Higuera Apartments
 30 3 1.9 mi
Afuera de Chorro Water Company
 85 1 2.0 mi
Lopez Project
 69 1 2.6 mi
Irish Hills Mutual Water CO
 135 0 2.8 mi
Nacimiento Water Project
 0 0 2.9 mi
Bassi Ranch Mutual Water Co.
 85 2 3.1 mi
Bear Valley Water Company
 45 2 3.1 mi
Golden State Water Company Edna
 1,495 0 3.5 mi
Baron Canyon Mutual Water Co.
 81 0 3.8 mi
California Mens Colony
 15,000 0 4.7 mi
Avila Valley Mutual Water CO
 75 0 5.6 mi
San Miguelito Mwc
 1,600 1 5.9 mi
Chorro Valley Pipeline Slo County
 0 0 6.0 mi
Anza Vineyard Estates Mutual Water CO
 60 0 6.5 mi
Edna Valley Ranch East
 132 0 6.6 mi
Avila Beach Community Services District
 1,630 0 6.9 mi
Pismo Beach Water Department
 7,944 2 8.0 mi
H2o, INC
 70 1 8.1 mi
Varian Ranch Mutual Water
 105 0 8.8 mi
Slo Cwwd No. 23 Santa Margarita
 1,291 0 9.2 mi
Monte Sereno Mutual Benefit Water
 65 0 9.7 mi
City of Grover Beach Public Works Dept
 12,701 0 10.2 mi
Terra de Oro Water Company
 38 0 10.4 mi
Los Osos Community Services District
 7,086 0 10.4 mi
Golden State Water Company los Osos
 5,942 0 10.5 mi
All 72 community water systems in San Luis Obispo County
Non-community systems in San Luis Obispo County (100: schools, campgrounds, workplaces, restaurants)

These systems serve places you visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Elks Lodge #322
 40 3 1
Madonna Inn Water Company
 120 3 1
Tank Farm Business Park
 45 2 1
Holdgrafer & Associates
 30 0 0
Parsons Water Supply
 35 0 0
Horizon Lane Water Supply
 32 0 0
Tmc Suburban, LLC
 25 0 0
Tiger Water Supply
 1,600 0 0
141 Suburban Road Water Supply
 25 1 0
Toyota San Luis Obispo
 57 0 0
Paragon Triangle Water Supply
 50 0 0
Fiero Lane Water Company, Inc.
 324 0 0
Waste Connections Water CO
 35 1 0
Slo Partners
 40 1 1
J M Sims Water Supply
 34 0 0
Vachell Water System
 150 1 1
Octagon Barn Center Association
 200 0 0
Noll Properties
 100 0 0
Strasbaugh, INC
 200 1 0
Congregation Beth David
 25 0 0
Edna Valley Vineyards
 30 0 0
Playa Dulce
 35 0 0
Sycamore Mineral Springs Resort
 200 1 1
Center of Effort Winery
 75 0 0
Chamisal Vineyards
Cayucos 		40 0 0
Port San Luis Harbor District
 125 0 0
Coastal Christian School
 650 0 0
Santa Margarita Ranch Headquarters
Cayucos 		62 0 0
Santa Margarita KOA
 70 0 0
Talley Farms Labor Housing
 90 0 0
Biddle Regional County Park
 27 0 0
Santa Margarita Recreation Area
 150 0 0
Branch Elementary School
 253 0 0
Montana de Oro State Park
 990 1 0
Cerro Alto Campground
 30 1 0
Pacific Dunes Ranch
 26 0 0
Lopez Recreation Area
 100 0 0
Laetitia Vineyard & Winery INC
 62 0 0
Halfway Station
 25 1 0
Granite Ridge
 50 0 0
Greenheart Farms
 91 0 0
Ball Tagawa Growers
 60 0 0
Precision Mutual Water Company
 25 1 0
Zoo Med-Winterhaven
Cayucos 		80 1 0
Sheridan Road Mutual Water Association
 38 1 1
Speedling, INC
 40 0 0
The Anderson
Cayucos 		500 0 0
Calipaso Winery
Cayucos 		130 0 0
LE Cuvier Winery
Cayucos 		92 0 0
Jack Ready Imagination Park
Cayucos 		200 0 0
All non-community systems
About this data

Water systems are matched to San Luis Obispo County, nearest to San Luis Obispo 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.