F0/100
CITY OF LATHROP — Water Quality Report 2026
Serving 35,080 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3910015
Violations
50
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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 CITY OF LATHROP
Is CITY OF LATHROP water safe to drink?
CITY OF LATHROP water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 50 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CITY OF LATHROP detected?
69 contaminants were tested in CITY OF LATHROP's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CITY OF LATHROP have any EPA violations?
Yes, CITY OF LATHROP has 50 EPA violation(s) on record, with the most recent in 2018. Violation types include MR, MCL, Other. 42 are health-based violations.
How many people does CITY OF LATHROP serve?
CITY OF LATHROP serves approximately 35,080 people, California. The system provides water to 1 community: Lathrop.
What type of water does CITY OF LATHROP provide?
CITY OF LATHROP 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 CA3910015.
How does CITY OF LATHROP compare to other utilities in California?
CITY OF LATHROP scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.