City guide · ZIP / utility based
Oakland tap water quality
Oakland and many East Bay ZIPs map to East Bay MUD. Nearby cities may share the same regional system.
Honest framing: This is not a citywide water score. We match your ZIP to a public water system using CA service-area data where available. Contaminant lists are curated detections — non-detects are omitted. Educational only — not medical advice, not a faucet lab test, and not affiliated with EWG or any utility.
About 26 ZIP codes in our index are labeled Oakland (Alameda County). Pick an example below or enter your own ZIP.
Example ZIPs in Oakland
94601 Oakland
94602 Oakland
94603 Oakland
94604 Oakland
94605 Oakland
94606 Oakland
94607 Oakland
94609 Oakland
94610 Oakland
94611 Oakland
94612 Oakland
94613 Oakland
Utilities often matched near Oakland
Names come from public CA water-system records for ZIPs labeled Oakland. Your block may differ — always open the ZIP report.
- East Bay MUD
- Oak Creek Mobile Home Park
- Hollister Ranch Estates
Want the full drinking water report?
Open a ZIP report for curated detections vs EPA limits and CA health guidelines. Open report for 94601 →
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