A99/100
CUCAMONGA VALLEY WATER DISTRICT — Water Quality Report 2026
Serving 211,069 people · California
Water Source
Surface Water
County
—
System ID
CA3610018
Violations
1
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1987.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CUCAMONGA VALLEY WATER DISTRICT
Is CUCAMONGA VALLEY WATER DISTRICT water safe to drink?
CUCAMONGA VALLEY WATER DISTRICT water receives a grade of A (99/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CUCAMONGA VALLEY WATER DISTRICT detected?
76 contaminants were tested in CUCAMONGA VALLEY WATER DISTRICT's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CUCAMONGA VALLEY WATER DISTRICT have any EPA violations?
Yes, CUCAMONGA VALLEY WATER DISTRICT has 1 EPA violation(s) on record, with the most recent in 1987. Violation types include Other.
How many people does CUCAMONGA VALLEY WATER DISTRICT serve?
CUCAMONGA VALLEY WATER DISTRICT serves approximately 211,069 people, California.
What type of water does CUCAMONGA VALLEY WATER DISTRICT provide?
CUCAMONGA VALLEY WATER DISTRICT sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA3610018.
How does CUCAMONGA VALLEY WATER DISTRICT compare to other utilities in California?
CUCAMONGA VALLEY WATER DISTRICT scores 99/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.