A90/100
CHINO, CITY OF — Water Quality Report 2026
Serving 86,435 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3610012
Violations
7
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2021 – September 3, 2022Rule: Ground Water RuleEnforcement: Formal — state order issued
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, CITY OF
Is CHINO, CITY OF water safe to drink?
CHINO, CITY OF water receives a grade of A (90/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CHINO, CITY OF detected?
76 contaminants were tested in CHINO, CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CHINO, CITY OF have any EPA violations?
Yes, CHINO, CITY OF has 7 EPA violation(s) on record, with the most recent in 2021. Violation types include MR.
How many people does CHINO, CITY OF serve?
CHINO, CITY OF serves approximately 86,435 people, California. The system provides water to 1 community: Chino.
What type of water does CHINO, CITY OF provide?
CHINO, 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 CA3610012.
How does CHINO, CITY OF compare to other utilities in California?
CHINO, CITY OF 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.