C53/100
SEBASTOPOL, CITY OF — Water Quality Report 2026
Serving 7,522 people · California
Water Source
Groundwater
County
—
System ID
CA4910011
Violations
11
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2009.
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 SEBASTOPOL, CITY OF
Is SEBASTOPOL, CITY OF water safe to drink?
SEBASTOPOL, CITY OF water receives a grade of C (53/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 11 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has SEBASTOPOL, CITY OF detected?
31 contaminants were tested in SEBASTOPOL, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does SEBASTOPOL, CITY OF have any EPA violations?
Yes, SEBASTOPOL, CITY OF has 11 EPA violation(s) on record, with the most recent in 2009. Violation types include MCL, Other. 9 are health-based violations.
How many people does SEBASTOPOL, CITY OF serve?
SEBASTOPOL, CITY OF serves approximately 7,522 people, California. The system provides water to 1 community: Sebastopol.
What type of water does SEBASTOPOL, CITY OF provide?
SEBASTOPOL, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4910011.
How does SEBASTOPOL, CITY OF compare to other utilities in California?
SEBASTOPOL, CITY OF scores 53/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our California state page for a full comparison of water systems.