B60/100
NAPA, CITY OF — Water Quality Report 2026
Serving 84,804 people · California
Water Source
Surface Water
County
—
System ID
CA2810003
Violations
9
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 400.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2016.
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 NAPA, CITY OF
Is NAPA, CITY OF water safe to drink?
NAPA, CITY OF water receives a grade of B (60/100), which is considered good. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has NAPA, CITY OF detected?
69 contaminants were tested in NAPA, CITY OF's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does NAPA, CITY OF have any EPA violations?
Yes, NAPA, CITY OF has 9 EPA violation(s) on record, with the most recent in 2016. Violation types include MCL, TT, Other. 7 are health-based violations.
How many people does NAPA, CITY OF serve?
NAPA, CITY OF serves approximately 84,804 people, California. The system provides water to 1 community: Napa.
What type of water does NAPA, CITY OF provide?
NAPA, CITY OF 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 CA2810003.
How does NAPA, CITY OF compare to other utilities in California?
NAPA, CITY OF scores 60/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our California state page for a full comparison of water systems.