After the Eaton Fire, many homes remained standing but were coated with the ashes of structures that burned. Post-fire testing showed these surviving homes contained lead, asbestos and other heavy materials that pose a risk to human health.

On Thursday, a group of residents released results from a new round of testing in dozens of homes. The findings show contaminants remain present in many homes, even after professional cleaning.

Francois Tissot, a CalTech geochemistry professor who was not involved in the effort, said the results are concerning.

“I personally was expecting that the values post-remediation in most houses would look really good,” Tissot said.

Instead, 63% of tested homes had lead on their floors at levels far above EPA screening thresholds.

It’s a result Tisso

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