A95/100
TUD - UPPER BASIN WATER SYSTEM — Water Quality Report 2026
Serving 13,280 people · California
Water Source
Surface Water
County
—
System ID
CA5510012
Violations
1
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1996.
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 - UPPER BASIN WATER SYSTEM
Is TUD - UPPER BASIN WATER SYSTEM water safe to drink?
TUD - UPPER BASIN WATER SYSTEM water receives a grade of A (95/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has TUD - UPPER BASIN WATER SYSTEM detected?
31 contaminants were tested in TUD - UPPER BASIN WATER SYSTEM's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does TUD - UPPER BASIN WATER SYSTEM have any EPA violations?
Yes, TUD - UPPER BASIN WATER SYSTEM has 1 EPA violation(s) on record, with the most recent in 1996. Violation types include TT. 1 are health-based violations.
How many people does TUD - UPPER BASIN WATER SYSTEM serve?
TUD - UPPER BASIN WATER SYSTEM serves approximately 13,280 people, California.
What type of water does TUD - UPPER BASIN WATER SYSTEM provide?
TUD - UPPER BASIN 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 CA5510012.
How does TUD - UPPER BASIN WATER SYSTEM compare to other utilities in California?
TUD - UPPER BASIN WATER SYSTEM scores 95/100 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.