A99/100
SAN JOAQUIN COUNTY - COLONIAL HEIGHTS — Water Quality Report 2026
Serving 1,841 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3910002
Violations
1
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1993.
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 SAN JOAQUIN COUNTY - COLONIAL HEIGHTS
Is SAN JOAQUIN COUNTY - COLONIAL HEIGHTS water safe to drink?
SAN JOAQUIN COUNTY - COLONIAL HEIGHTS water receives a grade of A (99/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has SAN JOAQUIN COUNTY - COLONIAL HEIGHTS detected?
1 contaminants were tested in SAN JOAQUIN COUNTY - COLONIAL HEIGHTS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does SAN JOAQUIN COUNTY - COLONIAL HEIGHTS have any EPA violations?
Yes, SAN JOAQUIN COUNTY - COLONIAL HEIGHTS has 1 EPA violation(s) on record, with the most recent in 1993. Violation types include MR.
How many people does SAN JOAQUIN COUNTY - COLONIAL HEIGHTS serve?
SAN JOAQUIN COUNTY - COLONIAL HEIGHTS serves approximately 1,841 people, California.
What type of water does SAN JOAQUIN COUNTY - COLONIAL HEIGHTS provide?
SAN JOAQUIN COUNTY - COLONIAL HEIGHTS 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 CA3910002.
How does SAN JOAQUIN COUNTY - COLONIAL HEIGHTS compare to other utilities in California?
SAN JOAQUIN COUNTY - COLONIAL HEIGHTS 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.