Water Quality in San Jose, CA (94404)

EPA violation data for public water systems serving ZIP code 94404.

Past Health-Based Violations

1 health-based violation was found in the past 5 years, meaning contaminant levels exceeded federal safety limits. All have since been resolved. There are also 3 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.

35,881

Population

14

Water Systems

4

Violations (5yr)

1

Health-Based

Location

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Water Systems Serving This Area (14)

City Of Daly City

Purchased surface water 104,901 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

California Water Service - San Mateo

Purchased surface water 102,348 people served
0 violations
Lead tested: 4.4 ppb (limit: 15 ppb) ✓

City Of Redwood City

Purchased surface water 92,819 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

California Water Service-S San Francisco

Purchased surface water 64,146 people served
0 violations
Lead tested: 1.9 ppb (limit: 15 ppb) ✓

California Water Service - Bear Gulch

Surface water 61,431 people served
0 violations
Lead tested: 4 ppb (limit: 15 ppb) ✓

City Of San Bruno

Purchased surface water 41,327 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

North Coast County Water Dist

Purchased surface water 38,546 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

Estero Municipal Improvement District

All resolved
Purchased surface water 36,556 people served
1 violation (5yr) · All resolved

California Water Service - San Carlos

Purchased surface water 35,344 people served
0 violations
Lead tested: 5.8 ppb (limit: 15 ppb) ✓

City Of Burlingame

Purchased surface water 31,451 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓

Boulder Creek Scout Reserv.

1 health-based
Groundwater 302 people served
3 violations (5yr) · 1 health-based · All resolved

Cutter Scout Reservation - Inactive

Groundwater 77 people served
0 violations

Bsa/Camp Oljato

Groundwater 45 people served
0 violations

Best Eight Partnership

Groundwater 25 people served
0 violations

Contaminants Found

Revised Total Coliform RuleHealth-Based

Missed testing deadlines — not a detection of bacteria.

2 violations
All resolved
TTHMMonitoring
1 violation
All resolved
NitrateMonitoring

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

1 violation
All resolved

Lead & Copper Levels

Lead (Pb)

Within limit
0 ppb measured Action level: 15 ppb

Sampled: Jan 2023

How Does This Compare?

San Jose (94404) 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.

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

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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