City guide · ZIP / utility based

Rancho Cucamonga tap water quality

Rancho Cucamonga ZIPs map to local IE utilities. Search your ZIP for curated detections from public lab data.

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 Rancho Cucamonga (San Bernardino County). Pick an example below or enter your own ZIP.

Example ZIPs in Rancho Cucamonga

91701 Rancho Cucamonga 91729 Rancho Cucamonga 91730 Rancho Cucamonga 91737 Rancho Cucamonga 91739 Rancho Cucamonga

Utilities often matched near Rancho Cucamonga

Names come from public CA water-system records for ZIPs labeled Rancho Cucamonga. Your block may differ — always open the ZIP report.

Cucamonga Valley Water District
Del Rio Mutual

Want the full drinking water report?

Open a ZIP report for curated detections vs EPA limits and CA health guidelines. Open report for 91701 →

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