City guide · ZIP / utility based
Concord tap water quality
Concord Contra Costa ZIPs often map to Contra Costa Water District or related systems. Search your ZIP to confirm.
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 8 ZIP codes in our index are labeled Concord (Contra Costa County). Pick an example below or enter your own ZIP.
Example ZIPs in Concord
94518 Concord
94519 Concord
94520 Concord
94521 Concord
94522 Concord
94524 Concord
94527 Concord
94529 Concord
Utilities often matched near Concord
Names come from public CA water-system records for ZIPs labeled Concord. Your block may differ — always open the ZIP report.
- Contra Costa Water District
- Ccwd/Brentwood Wtp
- Randall-Bold Water Treatment Plant
Want the full drinking water report?
Open a ZIP report for curated detections vs EPA limits and CA health guidelines. Open report for 94518 →
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