Tapcensus

Water quality for ZIP code 93453

ZIP 93453 covers Santa Margarita 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

Varian Ranch Mutual Water CA4000765 · Community water system · Ground water
Serves 105 people Rules violated, past 3 years 0 Last sanitary survey Dec 13, 2023 Distance 17.2 mi
View system details EPA facility report

Other community water systems in San Luis Obispo County

71 systems, nearest first
SystemServesStatusRules violated, 3 yrDistance
Las Ventanas Ranch
 108 0 17.5 mi
Edna Valley Ranch East
 132 0 18.4 mi
Monte Sereno Mutual Benefit Water
 65 0 18.4 mi
H2o, INC
 70 1 19.2 mi
Rancho Nipomo Water Company
 44 0 20.3 mi
Country Hills Estates
 60 0 20.6 mi
Canyon Crest Mutual Benefit WC
 133 0 20.7 mi
Slo Cwwd No. 23 Santa Margarita
 1,291 0 20.7 mi
Terra de Oro Water Company
 38 0 20.8 mi
Afuera de Chorro Water Company
 85 1 21.1 mi
Garden Farms C.w.d.
 440 1 21.3 mi
Rim Rock Water Company
 55 2 21.3 mi
Golden State Water Company Edna
 1,495 0 21.6 mi
Lopez Project
 69 1 22.1 mi
City of Arroyo Grande Utilities Division
 17,963 1 22.3 mi
Nacimiento Water Project
 0 0 22.7 mi
Nipomo Comm Services Dist
 13,771 0 22.8 mi
San Luis Obispo Water Department
 49,534 0 23.2 mi
Anza Vineyard Estates Mutual Water CO
 60 0 23.2 mi
Ken Mar Gardens
 84 2 23.3 mi
Halcyon Water System
 110 3 23.6 mi
Golden State Water Company-Cypress Ridge
 2,032 0 23.8 mi
Atascadero State Hospital
 1,100 1 24.0 mi
Golden State Water Company Nipomo
 4,512 0 24.1 mi
City of Grover Beach Public Works Dept
 12,701 0 24.1 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
Carrisa Plains Elementary
 40 1 0
Lopez Recreation Area
 100 0 0
Santa Margarita Recreation Area
 150 0 0
Santa Margarita KOA
 70 0 0
Biddle Regional County Park
 27 0 0
Talley Farms Labor Housing
 90 0 0
Granite Ridge
 50 0 0
Branch Elementary School
 253 0 0
Chamisal Vineyards
Cayucos 		40 0 0
Edna Valley Vineyards
 30 0 0
Center of Effort Winery
 75 0 0
Creston Elementary School
 100 0 0
Loading Chute
 25 1 0
Longbranch Saloon, the
 30 0 0
Creston Country Store
 25 1 0
Santa Margarita Ranch Headquarters
Cayucos 		62 0 0
Speedling, INC
 40 0 0
Laetitia Vineyard & Winery INC
 62 0 0
Parsons Water Supply
 35 0 0
Strasbaugh, INC
 200 1 0
Tiger Water Supply
 1,600 0 0
Noll Properties
 100 0 0
Fiero Lane Water Company, Inc.
 324 0 0
Slo Partners
 40 1 1
J M Sims Water Supply
 34 0 0
Waste Connections Water CO
 35 1 0
Coastal Christian School
 650 0 0
Holdgrafer & Associates
 30 0 0
Horizon Lane Water Supply
 32 0 0
Tmc Suburban, LLC
 25 0 0
Tank Farm Business Park
 45 2 1
Elks Lodge #322
 40 3 1
Cuyama Lane Water Company
 25 3 1
Madonna Inn Water Company
 120 3 1
141 Suburban Road Water Supply
 25 1 0
Paragon Triangle Water Supply
 50 0 0
Vachell Water System
 150 1 1
Ball Tagawa Growers
 60 0 0
Octagon Barn Center Association
 200 0 0
Toyota San Luis Obispo
 57 0 0
Greenheart Farms
 91 0 0
Pacific Dunes Ranch
 26 0 0
Congregation Beth David
 25 0 0
Jack Ready Imagination Park
Cayucos 		200 0 0
Precision Mutual Water Company
 25 1 0
Zoo Med-Winterhaven
Cayucos 		80 1 0
Sheridan Road Mutual Water Association
 38 1 1
Playa Dulce
 35 0 0
Sycamore Mineral Springs Resort
 200 1 1
Caelesta Winery
Cayucos 		30 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.