Tapcensus

Water quality for ZIP code 93442

ZIP 93442 covers Morro Bay and Cayucos in San Luis Obispo County, California, one of 23 ZIP codes in the county. 172 active public water systems serve the county; 54 had an EPA violation in the past three years.

Most likely your provider

Rancho Colina Mobile Home Park CA4000653 · Community water system · Ground water
Serves 252 people Rules violated, past 3 years 1 Last sanitary survey Apr 20, 2026 Distance 2.4 mi
View system details EPA facility report

Other community water systems in San Luis Obispo County

71 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Morro Bay PW Dept Water Division
 10,757 0 3.8 mi
Slocsa #10a Cayucos
 1,200 0 4.9 mi
Los Osos Community Services District
 7,086 0 5.6 mi
Slo Csa No. 10 Cayucos Wtp
 0 0 5.9 mi
Cayucos Beach Mutual Water Company
 2,567 0 6.2 mi
Chorro Valley Pipeline Slo County
 0 0 6.3 mi
Morro Rock Mutual Water CO
 2,181 0 6.5 mi
Golden State Water Company los Osos
 5,942 0 6.7 mi
S & T Mutual Water Company
 591 0 6.7 mi
California Mens Colony
 15,000 0 7.8 mi
Atascadero Mutual Water CO
 33,307 0 8.2 mi
Bassi Ranch Mutual Water Co.
 85 2 10.2 mi
Bear Valley Water Company
 45 2 10.2 mi
Atascadero State Hospital
 1,100 1 10.3 mi
Nacimiento Water Project
 0 0 10.4 mi
Irish Hills Mutual Water CO
 135 0 10.5 mi
Slo Cwwd No. 23 Santa Margarita
 1,291 0 10.8 mi
Garden Farms C.w.d.
 440 1 10.9 mi
Templeton Csd
 8,041 0 11.7 mi
San Luis Obispo Water Department
 49,534 0 11.7 mi
Higuera Apartments
 30 3 13.1 mi
Los Robles Mobile Home Estates
 420 0 13.2 mi
Walnut Hills Mutual Water CO
 486 0 13.4 mi
Afuera de Chorro Water Company
 85 1 13.7 mi
Santa Ysabel Ranch Mwc
 344 0 14.5 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
Cerro Alto Campground
 30 1 0
Halfway Station
 25 1 0
The Anderson
Cayucos 		500 0 0
Calipaso Winery
Cayucos 		130 0 0
LE Cuvier Winery
Cayucos 		92 0 0
Montana de Oro State Park
 990 1 0
Congregation Beth David
 25 0 0
Santa Margarita Ranch Headquarters
Cayucos 		62 0 0
Aronhill Vineyard
 25 0 0
Madonna Inn Water Company
 120 3 1
Tiger Water Supply
 1,600 0 0
Elks Lodge #322
 40 3 1
Niner Wine Estates, LLC
 25 0 0
Jada Vineyard and Winery
San Simeon 		39 0 0
Toyota San Luis Obispo
 57 0 0
Booker Winery
Cayucos 		56 0 0
Tank Farm Business Park
 45 2 1
Paragon Triangle Water Supply
 50 0 0
141 Suburban Road Water Supply
 25 1 0
Holdgrafer & Associates
 30 0 0
Tmc Suburban, LLC
 25 0 0
Vachell Water System
 150 1 1
Horizon Lane Water Supply
 32 0 0
Octagon Barn Center Association
 200 0 0
Parsons Water Supply
 35 0 0
Grosso Kresser Winery
San Simeon 		3,606 0 0
Paso Robles Chevrolet Cadillac
 25 0 0
Brecon Estate
San Simeon 		9,012 0 0
Caelesta Winery
Cayucos 		30 0 0
Waste Connections Water CO
 35 1 0
J M Sims Water Supply
 34 0 0
Slo Partners
 40 1 1
Fiero Lane Water Company, Inc.
 324 0 0
Noll Properties
 100 0 0
Strasbaugh, INC
 200 1 0
Harmony Water Works
 27 0 0
Sycamore Mineral Springs Resort
 200 1 1
Playa Dulce
 35 0 0
Granite Ridge
 50 0 0
Port San Luis Harbor District
 125 0 0
Carpenter Winery
Cayucos 		54 0 0
Daou Vineyards, LLC
 26 0 0
Mt. Olive Organic Farm
Cayucos 		51 0 0
Adelaida Vineyards & Winery
San Simeon 		27 1 0
Edna Valley Vineyards
 30 0 0
Loading Chute
 25 1 0
Creston Country Store
 25 1 0
Longbranch Saloon, the
 30 0 0
Creston Elementary School
 100 0 0
Santa Margarita Recreation Area
 150 0 0
All non-community systems
About this data

Water systems are matched to San Luis Obispo 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.