A95/100
WALNUT VALLEY WATER DISTRICT — Water Quality Report 2026
Serving 100,941 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA1910234
Violations
1
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1994.
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 WALNUT VALLEY WATER DISTRICT
Is WALNUT VALLEY WATER DISTRICT water safe to drink?
WALNUT VALLEY WATER DISTRICT water receives a grade of A (95/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has WALNUT VALLEY WATER DISTRICT detected?
76 contaminants were tested in WALNUT VALLEY WATER DISTRICT's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does WALNUT VALLEY WATER DISTRICT have any EPA violations?
Yes, WALNUT VALLEY WATER DISTRICT has 1 EPA violation(s) on record, with the most recent in 1994. Violation types include MCL. 1 are health-based violations.
How many people does WALNUT VALLEY WATER DISTRICT serve?
WALNUT VALLEY WATER DISTRICT serves approximately 100,941 people, California.
What type of water does WALNUT VALLEY WATER DISTRICT provide?
WALNUT VALLEY WATER DISTRICT sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA1910234.
How does WALNUT VALLEY WATER DISTRICT compare to other utilities in California?
WALNUT VALLEY WATER DISTRICT scores 95/100 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.