A81/100
TREASURE ISLAND — Water Quality Report 2026
Serving 3,864 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3810702
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.100 mg/L | 0.015 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1998.
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 TREASURE ISLAND
Is TREASURE ISLAND water safe to drink?
TREASURE ISLAND water receives a grade of A (81/100), which is considered excellent. Out of 1 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has TREASURE ISLAND detected?
1 contaminants were tested in TREASURE ISLAND's water. Notable contaminants include Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does TREASURE ISLAND have any EPA violations?
Yes, TREASURE ISLAND has 3 EPA violation(s) on record, with the most recent in 1998. Violation types include MR, MCL. 2 are health-based violations.
How many people does TREASURE ISLAND serve?
TREASURE ISLAND serves approximately 3,864 people, California.
What type of water does TREASURE ISLAND provide?
TREASURE ISLAND sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA3810702.
How does TREASURE ISLAND compare to other utilities in California?
TREASURE ISLAND scores 81/100 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.