The explosion happened on July 1, 2025, at a site where officials said Devastating Pyrotechnics LLC and Blackstar Fireworks, Inc. manufactured and stored dangerous fireworks. The explosion killed seven workers.
The civil grand jury report, titled "Esparto Fireworks Explosion: Officials Knew, None Acted," says that there were nearly a dozen county employees who knew about the operations at the site, with records showing there was communication regarding concerns about the site. However, the report says there was no record of the employees advocating for enforcement.
"County Building Services Department officials in a series of emails said they were going out to the site to conduct an inspection, noting that they would 'tread lightly' as the property was owned by sheriff's deputies '…including deputies that we work with,'" the grand jury report said.
After that visit, the Yolo County Community Services Department began to take possible enforcement action against the property, the grand jury report said. But email records stopped within days and no action was taken, the report said.
The grand jury said it heard testimony that, over the years, the board of supervisors "fostered a culture of tolerance for code violations that percolated through County bureaucracy."
The county added that it has begun internal reviews of its process, which includes code enforcement procedures. County officials said they will review the report and respond within 90 days.
Earlier this year, Cal Fire said it finished its investigation into the explosion, alleging illegal activities were uncovered.
CBS Sacramento has reported that Yolo County Sheriff's Lieutenant Sam Machado and his wife, Tammy, owned the property and were placed on administrative leave.
The grand jury report also says Rieko Matsumura, Tammy's sister, was a deputy in Esparto and was placed on disability leave due to an unrelated injury before the explosion. Matsumura retired from the department in September.
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