City guide · ZIP / utility based
Fremont tap water quality
Fremont South Bay ZIPs map to Alameda County Water District or neighbors. Check your ZIP for the matched PWSID.
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 5 ZIP codes in our index are labeled Fremont (Alameda County). Pick an example below or enter your own ZIP.
Example ZIPs in Fremont
Utilities often matched near Fremont
Names come from public CA water-system records for ZIPs labeled Fremont. Your block may differ — always open the ZIP report.
- Alameda County Water District
- City of Pleasanton
Want the full drinking water report?
Open a ZIP report for curated detections vs EPA limits and CA health guidelines. Open report for 94536 →
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