Water Quality in San Luis Obispo, CA (93465)
EPA violation data for public water systems serving ZIP code 93465.
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 83% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
11,039
Population
19
Water Systems
27
Violations (5yr)
15
Health-Based
Location
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Water Systems Serving This Area (19)
Santa Margarita Recreation Area
San Luis Obispo Water Department
City Of Paso Robles Water Division
Atascadero Mutual Water Co
Brecon Estate
Templeton Csd
Los Robles Mobile Home Estates
Lake Isabella Koa Campground
12 health-basedSpanish Lakes Mutual Water Co
Thirty Mile Cg
1 health-basedSanta Lucia School
All resolvedTrujillo Meadows Cg
1 health-basedElk Creek Cg
All resolvedAspen Glade Cg
1 health-basedRichard Nock, Pres
Big Meadows Campground
All resolvedCrystal Cave
Shandon Rest Stop - Inactive
Aronhill Vineyard
Contaminants Found
At high levels, nitrate can cause blue baby syndrome in infants.
Missed testing deadlines — not a detection of bacteria.
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 (93465) has more violations than 83% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 27.
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
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) 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.