F0/100
ROHNERT PARK, CITY OF — Water Quality Report 2026
Serving 43,821 people · California
Water Source
Groundwater
County
—
System ID
CA4910014
Violations
278
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
vanadium | 25.00 µg/L | — | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2021 – July 31, 2021Rule: Total Coliform 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 ROHNERT PARK, CITY OF
Is ROHNERT PARK, CITY OF water safe to drink?
ROHNERT PARK, CITY OF water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 278 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ROHNERT PARK, CITY OF detected?
66 contaminants were tested in ROHNERT PARK, CITY OF's water. Notable contaminants include vanadium. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does ROHNERT PARK, CITY OF have any EPA violations?
Yes, ROHNERT PARK, CITY OF has 278 EPA violation(s) on record, with the most recent in 2021. Violation types include MON, MR, MCL. 2 are health-based violations.
How many people does ROHNERT PARK, CITY OF serve?
ROHNERT PARK, CITY OF serves approximately 43,821 people, California. The system provides water to 1 community: Rohnert Park.
What type of water does ROHNERT PARK, CITY OF provide?
ROHNERT PARK, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4910014.
How does ROHNERT PARK, CITY OF compare to other utilities in California?
ROHNERT PARK, CITY OF scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.