A89/100
SONOMA COUNTY CSA 41-FITCH MOUNTAIN — Water Quality Report 2026
Serving 1,265 people · California
Water Source
Purchased Groundwater
County
—
System ID
CA4910010
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.50 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: June 1, 2022 – March 22, 2024Rule: Ground Water RuleEnforcement: Formal — state order issued
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 SONOMA COUNTY CSA 41-FITCH MOUNTAIN
Is SONOMA COUNTY CSA 41-FITCH MOUNTAIN water safe to drink?
SONOMA COUNTY CSA 41-FITCH MOUNTAIN water receives a grade of A (89/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SONOMA COUNTY CSA 41-FITCH MOUNTAIN detected?
2 contaminants were tested in SONOMA COUNTY CSA 41-FITCH MOUNTAIN's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does SONOMA COUNTY CSA 41-FITCH MOUNTAIN have any EPA violations?
Yes, SONOMA COUNTY CSA 41-FITCH MOUNTAIN has 3 EPA violation(s) on record, with the most recent in 2022. Violation types include MR.
How many people does SONOMA COUNTY CSA 41-FITCH MOUNTAIN serve?
SONOMA COUNTY CSA 41-FITCH MOUNTAIN serves approximately 1,265 people, California.
What type of water does SONOMA COUNTY CSA 41-FITCH MOUNTAIN provide?
SONOMA COUNTY CSA 41-FITCH MOUNTAIN sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4910010.
How does SONOMA COUNTY CSA 41-FITCH MOUNTAIN compare to other utilities in California?
SONOMA COUNTY CSA 41-FITCH MOUNTAIN scores 89/100 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.