What's in TREASURE ISLAND's water?

TREASURE ISLAND has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 3,864, over 186 connections.

Ranked against every other system in this dataset

TREASURE ISLAND has 3 violations on record in total, 2 of thems health-based - ranking it 7,028th of 12,903 systems by violation count, the 46th percentile nationally.

Against the CA average

TREASURE ISLAND's 2 health-based violations sit within the CA average of 5.8, across 803 systems statewide. The filter guide explains what a violation like this actually calls for.

Most recent violation on record

TREASURE ISLAND's most recent violation on record is dated 1998-01-12, with the most recent health-based one dated 1997-01-04. Last reported to EPA: 06/22/2026.

The concern categories on record

TREASURE ISLAND's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:

• Microbial contamination / treatment technique - flagged from: Coliform (TCR)

The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.

What TREASURE ISLAND's record does not cover

This is what TREASURE ISLAND reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. This record - 2 health-based violations on file for TREASURE ISLAND - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.