WaterSafety — Is Your Tap Water Safe?

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A

Alameda County Water District

Safety Score: 100/100

No violations on record. Serves 344,000 people.

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Data from WaterSafety

WaterSafety

Is your tap water safe? Check any US water system's violation history and Water Safety Score. Data from EPA SDWIS, updated quarterly.

Contaminants

Lead PFAS / Forever Chemicals Arsenic Nitrate Trihalomethanes

Tools

Worst Water Systems Best Water Systems Compare Systems Search by Zip Tools Water Safety Checker Contaminant Lookup Health Risk Report 2026 Report Grade A Systems Grade F Systems Health Violations Large Systems Surface Water

Resources

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Data sourced from EPA Safe Drinking Water Information System (SDWIS). Not affiliated with the US Environmental Protection Agency.