A98/100
TUD - TUOLUMNE WATER SYSTEM — Water Quality Report 2026
Serving 1,761 people · California
Water Source
Surface Water
County
—
System ID
CA5510003
Violations
2
Contaminant Test Results
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: April 1, 2025 – May 31, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
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 TUD - TUOLUMNE WATER SYSTEM
Is TUD - TUOLUMNE WATER SYSTEM water safe to drink?
TUD - TUOLUMNE WATER SYSTEM water receives a grade of A (98/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has TUD - TUOLUMNE WATER SYSTEM detected?
1 contaminants were tested in TUD - TUOLUMNE WATER SYSTEM's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does TUD - TUOLUMNE WATER SYSTEM have any EPA violations?
Yes, TUD - TUOLUMNE WATER SYSTEM has 2 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, Other.
How many people does TUD - TUOLUMNE WATER SYSTEM serve?
TUD - TUOLUMNE WATER SYSTEM serves approximately 1,761 people, California. The system provides water to 1 community: Sonora.
What type of water does TUD - TUOLUMNE WATER SYSTEM provide?
TUD - TUOLUMNE WATER SYSTEM sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA5510003.
How does TUD - TUOLUMNE WATER SYSTEM compare to other utilities in California?
TUD - TUOLUMNE WATER SYSTEM scores 98/100 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.