A90/100
CAL-WATER SERVICE CO.-WILLOWS — Water Quality Report 2026
Serving 7,240 people · California
Water Source
Groundwater
County
—
System ID
CA1110003
Violations
2
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1996.
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 CAL-WATER SERVICE CO.-WILLOWS
Is CAL-WATER SERVICE CO.-WILLOWS water safe to drink?
CAL-WATER SERVICE CO.-WILLOWS water receives a grade of A (90/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CAL-WATER SERVICE CO.-WILLOWS detected?
31 contaminants were tested in CAL-WATER SERVICE CO.-WILLOWS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CAL-WATER SERVICE CO.-WILLOWS have any EPA violations?
Yes, CAL-WATER SERVICE CO.-WILLOWS has 2 EPA violation(s) on record, with the most recent in 1996. Violation types include MCL. 2 are health-based violations.
How many people does CAL-WATER SERVICE CO.-WILLOWS serve?
CAL-WATER SERVICE CO.-WILLOWS serves approximately 7,240 people, California.
What type of water does CAL-WATER SERVICE CO.-WILLOWS provide?
CAL-WATER SERVICE CO.-WILLOWS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA1110003.
How does CAL-WATER SERVICE CO.-WILLOWS compare to other utilities in California?
CAL-WATER SERVICE CO.-WILLOWS scores 90/100 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.