Water Quality in San Luis Obispo, CA (93452)

EPA violation data for public water systems serving ZIP code 93452.

Past Health-Based Violations

2 health-based violations were found in the past 5 years, meaning contaminant levels exceeded federal safety limits. All have since been resolved. There are also 2 monitoring/reporting violations.

More violations than 48% of US ZIP codes.

Based on EPA compliance data. Not a substitute for an official water quality report from your utility.

217

Population

13

Water Systems

4

Violations (5yr)

2

Health-Based

Location

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Water Systems Serving This Area (13)

Santa Margarita Recreation Area

Groundwater 50,001 people served
0 violations

San Luis Obispo Water Department

Surface water 47,788 people served
0 violations

City Of Paso Robles Water Division

Surface water 31,176 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

Atascadero Mutual Water Co

Groundwater 30,618 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

Hearst State Beach

Groundwater 1,000 people served
0 violations

Montana De Oro State Park

All resolved
Surface water 990 people served
1 violation (5yr) · All resolved

Hearst Memorial State Beach

Purchased surface water 500 people served
0 violations

San Simeon Csd

2 health-based
Groundwater 462 people served
2 violations (5yr) · 2 health-based · All resolved
Lead tested: 45 ppb (limit: 15 ppb)

Hearst Monument State Park

Surface water 200 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

Ragged Point Inn

All resolved
Groundwater under influence of surface water 100 people served
1 violation (5yr) · All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓

Piedras Blancas Water Supply

Groundwater 25 people served
0 violations

Hearst State Hist. Monument

Groundwater 25 people served
0 violations

Csp San Simeon Creek St Beach

Groundwater 8 people served
0 violations

Contaminants Found

Surface Water Treatment RuleHealth-Based
2 violations
All resolved
NitrateMonitoring

At high levels, nitrate can cause blue baby syndrome in infants.

1 violation
All resolved
Lead and Copper RuleMonitoring

Lead and copper testing requirement. Lead exposure can cause developmental harm in children.

1 violation
All resolved

Lead & Copper Levels

Lead (Pb)

Within limit
0 ppb measured Action level: 15 ppb

Sampled: Jan 2025

How Does This Compare?

San Luis Obispo (93452) has more violations than 48% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 4.

Fewer violations 48th percentile More violations

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.

Whole House Carbon Filter

A solid baseline for improving overall water quality. Reduces chlorine, sediment, and many common contaminants throughout your entire home.

Targets:Chlorine, Sediment, Taste & Odor

Look for:NSF/ANSI 42 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

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.

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