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Tap water quality report

Treasure Island

EPA monitoring tested this supplier for 1 contaminant and detected 1. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

1
contaminants tested
1
detected
3,864
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Federal government
Counties served
San Francisco

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
6
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1997-04-01 → 1997-04-30
MCL Health-based Resolved 1997-04-01 → 1997-04-30
MCL Health-based Resolved 1997-02-01 → 1997-02-28
MCL Health-based Resolved 1997-02-01 → 1997-02-28
MR Monitoring Resolved 1998-12-01 → 1998-12-31
MR Monitoring Resolved 1998-12-01 → 1998-12-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.1000 mg/L 667%
above the EPA limit of 0.0150 mg/L
 21/21 LCR 2024

Utility contact

Contact
DEGRACA, ANDREW
Phone
650-652-3100
Email
[email protected]

Frequently asked questions about Treasure Island

Is Treasure Island tap water safe to drink?

EPA monitoring detected 1 contaminant in Treasure Island's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Treasure Island's water?

EPA monitoring detected Lead. The full list with the level and data source for each is above.

How many people does Treasure Island serve?

Treasure Island reports serving 3,864 people in California, per its EPA record.

Has Treasure Island had any water quality violations?

The EPA has 6 violations on file for Treasure Island, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.