Water Quality in San Luis Obispo, CA (93405)
EPA violation data for public water systems serving ZIP code 93405.
Active Health Violations
8 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 70% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
25,002
Population
14
Water Systems
14
Violations (5yr)
8
Health-Based
Location
Loading map...
Water Systems Serving This Area (14)
Santa Margarita Recreation Area
San Luis Obispo Water Department
City Of Paso Robles Water Division
Atascadero Mutual Water Co
Laureate Water Company
All resolvedSanta Ysabel Ranch Mwc
Sycamore Mineral Springs Resort
1 health-basedIrish Hills Mutual Water Co
Avila Valley Mutual Water Co
All resolvedWhitson Industrial Park
Monte Sereno Mutual Benefit Water
Tank Farm Business Park
7 health-basedAt&T Corp - Ca1059
Congregation Beth David
Contaminants Found
At high levels, nitrate can cause blue baby syndrome in infants.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jan 2025
How Does This Compare?
San Luis Obispo (93405) has more violations than 70% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 14.
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
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.