Overview
- A series of explosions at an Esparto fireworks storage and manufacturing site killed seven workers on July 1, 2025, setting off a year-long investigation into an alleged illegal explosives operation.
- A Yolo County grand jury indicted eight people in April 2026, and five defendants face seven counts of second-degree murder tied to the seven deaths.
- Prosecutors describe a decade-long, unpermitted enterprise that moved and stored massive quantities of fireworks and explosives, and court filings say former sheriff’s lieutenant Samuel Machado owned the property and helped shield the operation.
- Criminal proceedings are in early stages: several defendants made procedural appearances on July 1, 2026, and scheduled arraignments were postponed to July 30, 2026.
- Families continue public vigils and demand accountability while the grand jury’s finding that officials received a 2022 tip and “knew, none acted” is formally disputed by the Yolo County Board of Supervisors, raising renewed questions about local permitting and enforcement.