Water Quality in San Luis Obispo, CA (93446)
EPA violation data for public water systems serving ZIP code 93446.
Active Health Violations
27 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 86% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
45,554
Population
42
Water Systems
37
Violations (5yr)
27
Health-Based
Location
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Water Systems Serving This Area (42)
Santa Margarita Recreation Area
San Luis Obispo Water Department
City Of Paso Robles Water Division
Atascadero Mutual Water Co
Heritage Ranch Csd
10 health-basedDaou Vineyards, Llc
Walnut Hills Mutual Water Co
Vines R.V. Resort
Green River Mutual Water Co.
2 health-basedCal Shasta Club
Parrish Family Winery
Hop Kiln Winery
Snake River Resort
Paso 360
All resolvedChristmas Cove
Paso Robles Rv Ranch
All resolvedAdelaida Vineyards & Winery
Booker Winery
Carpenter Winery
Mt. Olive Organic Farm
Hunter Ranch Golf Course
Rancho Salinas Mbwc
Kukkula Inc
Halter Ranch Winery
All resolvedAlmira Water Association
13 health-basedJada Vineyard And Winery
Gold Rock Mhp
Mustang Mobile Village
Mustang Springs Mutual Water
2 health-basedBroken Earth Winery
San Antonio Horse World
Suburban Lodge
San Paso Truck Stop
All resolved7x Youth Ranch
Port-A-Port West - Inactive
Paso Robles Chevrolet Cadillac
Rifle Fairing Water Supply
Ada'S Lodges
All resolvedRamona Motel
Moe Water Supply - Inactive
Estrella Correctional Facility
Embers Cafe
Contaminants Found
A naturally occurring element that can cause cancer and other health effects at high levels.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
At high levels, nitrate can cause blue baby syndrome in infants.
Missed testing deadlines — not a detection of bacteria.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2025
How Does This Compare?
San Luis Obispo (93446) has more violations than 86% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 37.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.