Water Quality in San Luis Obispo, CA (93422)
EPA violation data for public water systems serving ZIP code 93422.
Active Health Violations
15 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 78% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
33,002
Population
13
Water Systems
19
Violations (5yr)
15
Health-Based
Location
Loading map...
Water Systems Serving This Area (13)
Santa Margarita Recreation Area
San Luis Obispo Water Department
City Of Paso Robles Water Division
Atascadero Mutual Water Co
Atascadero State Hospital
Atascadero State Hopsital
Garden Farms C.W.D.
All resolvedCreston Elementary School
Trumpet Vine Catering
Carrisa Plains Elementary
14 health-basedAtascadero Lake - Inactive
Halfway Station
All resolvedSilver Creek Water Company
1 health-basedContaminants Found
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 (93422) has more violations than 78% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 19.
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
One of the few filtration methods effective at removing nitrates and nitrites. Essential for households with infants.
Targets:Nitrate, Nitrite, Dissolved Solids
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.