A83/100
CITY OF VALLEJO — Water Quality Report 2026
Serving 121,420 people · California
Water Source
Surface Water
County
—
System ID
CA4810007
Violations
5
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 CITY OF VALLEJO
Is CITY OF VALLEJO water safe to drink?
CITY OF VALLEJO water receives a grade of A (83/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CITY OF VALLEJO detected?
76 contaminants were tested in CITY OF VALLEJO's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CITY OF VALLEJO have any EPA violations?
Yes, CITY OF VALLEJO has 5 EPA violation(s) on record, with the most recent in 1993. Violation types include TT, MR, MCL. 3 are health-based violations.
How many people does CITY OF VALLEJO serve?
CITY OF VALLEJO serves approximately 121,420 people, California. The system provides water to 1 community: Vallejo.
What type of water does CITY OF VALLEJO provide?
CITY OF VALLEJO sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA4810007.
How does CITY OF VALLEJO compare to other utilities in California?
CITY OF VALLEJO scores 83/100 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.