A88/100
CHINO HILLS, CITY OF — Water Quality Report 2026
Serving 76,414 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3610036
Violations
4
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 CHINO HILLS, CITY OF
Is CHINO HILLS, CITY OF water safe to drink?
CHINO HILLS, CITY OF water receives a grade of A (88/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CHINO HILLS, CITY OF detected?
69 contaminants were tested in CHINO HILLS, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CHINO HILLS, CITY OF have any EPA violations?
Yes, CHINO HILLS, CITY OF has 4 EPA violation(s) on record, with the most recent in 1994. Violation types include MCL, MR. 2 are health-based violations.
How many people does CHINO HILLS, CITY OF serve?
CHINO HILLS, CITY OF serves approximately 76,414 people, California. The system provides water to 1 community: Chino Hills.
What type of water does CHINO HILLS, CITY OF provide?
CHINO HILLS, CITY OF 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 CA3610036.
How does CHINO HILLS, CITY OF compare to other utilities in California?
CHINO HILLS, CITY OF scores 88/100 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.