C47/100
THUNDERBIRD CWD — Water Quality Report 2026
Serving 2,098 people · California
Water Source
Groundwater
County
—
System ID
CA3600306
Violations
17
Contaminant Test Results
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: January 1, 2025 – December 31, 2025Enforcement: Formal — state order issued
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: January 18, 2024 – December 30, 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 THUNDERBIRD CWD
Is THUNDERBIRD CWD water safe to drink?
THUNDERBIRD CWD water receives a grade of C (47/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 17 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has THUNDERBIRD CWD detected?
1 contaminants were tested in THUNDERBIRD CWD's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does THUNDERBIRD CWD have any EPA violations?
Yes, THUNDERBIRD CWD has 17 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, MR, MON. 9 are health-based violations.
How many people does THUNDERBIRD CWD serve?
THUNDERBIRD CWD serves approximately 2,098 people, California.
What type of water does THUNDERBIRD CWD provide?
THUNDERBIRD CWD sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA3600306.
How does THUNDERBIRD CWD compare to other utilities in California?
THUNDERBIRD CWD scores 47/100 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.