A80/100
TUD - SONORA/JAMESTOWN WATER SYSTEM — Water Quality Report 2026
Serving 11,054 people · California
Water Source
Surface Water
County
—
System ID
CA5510001
Violations
6
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 370.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/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: 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 - SONORA/JAMESTOWN WATER SYSTEM
Is TUD - SONORA/JAMESTOWN WATER SYSTEM water safe to drink?
TUD - SONORA/JAMESTOWN WATER SYSTEM water receives a grade of A (80/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has TUD - SONORA/JAMESTOWN WATER SYSTEM detected?
69 contaminants were tested in TUD - SONORA/JAMESTOWN WATER SYSTEM's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does TUD - SONORA/JAMESTOWN WATER SYSTEM have any EPA violations?
Yes, TUD - SONORA/JAMESTOWN WATER SYSTEM has 6 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, MR, TT. 2 are health-based violations.
How many people does TUD - SONORA/JAMESTOWN WATER SYSTEM serve?
TUD - SONORA/JAMESTOWN WATER SYSTEM serves approximately 11,054 people, California.
What type of water does TUD - SONORA/JAMESTOWN WATER SYSTEM provide?
TUD - SONORA/JAMESTOWN 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 CA5510001.
How does TUD - SONORA/JAMESTOWN WATER SYSTEM compare to other utilities in California?
TUD - SONORA/JAMESTOWN WATER SYSTEM scores 80/100 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.