DrinkingWaterCheck

THUNDERBIRD CWD: EPA violation history, explained

THUNDERBIRD CWD had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 2,098 people get their water from it, across 318 connections.

Ranked against every other system in this dataset

THUNDERBIRD CWD has 17 violations on record in total, 9 of thems health-based - ranking it 2,221th of 12,903 systems by violation count, the 83th percentile nationally.

How THUNDERBIRD CWD compares within CA

THUNDERBIRD CWD's 9 health-based violations sit above the CA average of 5.8, across 803 systems statewide. See the lead and copper guide for why lead counts differently.

Most recent violation on record

The last violation EPA has on record for THUNDERBIRD CWD is from 2025-06-01 (health-based: 2025-01-01). Last reported to EPA: 06/22/2026.

What kind of problem, specifically

THUNDERBIRD CWD'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:

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 this data is and is not

This is what THUNDERBIRD CWD 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 - 9 health-based violations on file for THUNDERBIRD CWD - 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.