A90/100
PETALUMA, CITY OF — Water Quality Report 2026
Serving 60,781 people · California
Water Source
Groundwater
County
—
System ID
CA4910006
Violations
2
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.60 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2005.
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 PETALUMA, CITY OF
Is PETALUMA, CITY OF water safe to drink?
PETALUMA, CITY OF water receives a grade of A (90/100), which is considered excellent. Out of 67 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has PETALUMA, CITY OF detected?
67 contaminants were tested in PETALUMA, CITY OF's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does PETALUMA, CITY OF have any EPA violations?
Yes, PETALUMA, CITY OF has 2 EPA violation(s) on record, with the most recent in 2005. Violation types include MR, Other.
How many people does PETALUMA, CITY OF serve?
PETALUMA, CITY OF serves approximately 60,781 people, California. The system provides water to 1 community: Petaluma.
What type of water does PETALUMA, CITY OF provide?
PETALUMA, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4910006.
How does PETALUMA, CITY OF compare to other utilities in California?
PETALUMA, CITY OF scores 90/100 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.