Rancho Cucamonga, California Water Quality Report
Water quality data for 4 water systems serving 211,996 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
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Compliance & Violations
Active Violations (18)
75
Dec 20, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
66
Jan 1, 2024
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Resolved Violations (408)
4B
Jan 1, 2025
4B
Jan 1, 2025
66
Jan 1, 2025
66
Jan 1, 2025
3A
Dec 1, 2024 — Dec 31, 2024
+ 403 more resolved violations
Frequently Asked Questions
Is Rancho Cucamonga tap water safe to drink?
Rancho Cucamonga's water meets all EPA maximum contaminant levels. However, 0 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Rancho Cucamonga tap water?
0 contaminants have been detected in Rancho Cucamonga's water supply across 4 water systems. See the full contaminant table above for details.
How can I improve my water quality in Rancho Cucamonga?
Install a water filter rated for the specific contaminants found in Rancho Cucamonga's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Rancho Cucamonga have any water quality violations?
Yes, Rancho Cucamonga currently has 18 active violations. See the violations section above for details.