Alameda County Water Quality: 2 Violations (CA)

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Water Quality Overview

Alameda County has 13 community water systems across 47 directly mapped ZIP records. The systems report serving approximately 2,230,570 people. The available records contain 2 EPA violations, including 1 health-based violation.

Health-based violations account for 50% of all violations in Alameda County. These violations indicate contaminant levels that may pose direct risks to human health.

Violation Breakdown

Health-based violations indicate contaminant levels exceeding EPA Maximum Contaminant Levels (MCLs). Monitoring violations indicate failures to test or report.

Cities with Most Violations

Violation Trend

Year-by-year EPA violations across water systems in Alameda County:

Most Common Contaminants

Water Data and the Home Safety Score

This page reports EPA water-system facts without converting the broader Home Safety Score into a drinking-water grade. The county Home Safety grade (unavailable) is a separate multi-source index that also requires PFAS screening, radon, and annual air-quality evidence. Check each ZIP report for the versioned score and its component coverage.

Water Systems in Alameda County

Alameda County is served by 13 community water systems, averaging 0.2 systems per ZIP code. Each system is independently regulated and tested by the EPA. Larger systems serving more people typically have more extensive monitoring requirements.

Water systems in Alameda County source water from a mix of surface water (rivers, reservoirs) and groundwater (wells, aquifers). Source type affects which contaminants are most likely to be detected.

How to Check Your Water in Alameda County

1. Enter your ZIP code on ZipCheckup for detailed water-system data including contaminant levels and violation history; the Home Safety Score is shown separately with its model version

2. Request your CCR — every water utility must provide an annual Consumer Confidence Report

3. Get a home test — certified kits ($20-$50) or professional lab tests ($150-$400) can detect contaminants not covered by routine testing

4. Consider filtration — NSF-certified filters can address specific contaminants found in your area

5. Check for lead — homes built before 1986 should test for lead regardless of utility compliance

EPA Enforcement

The EPA and state regulators have taken 62 enforcement actions against water systems in Alameda County. Enforcement actions range from compliance assistance and administrative orders to formal penalties. Systems under enforcement are required to remediate violations and may face ongoing monitoring requirements.

Data Sources

• Water quality: EPA Safe Drinking Water Information System (SDWIS)
• Enforcement: EPA ECHO

Source publication schedules vary. See the page source and verification fields for available timing evidence.

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