CSB: Failures in hazard recognition, dust control and leadership led to 2017 Didion Milling explosions; NFPA updated guidance, OSHA still urged to act A U.S. Chemical Safety Board investigation found that a May 31, 2017 combustible‑dust explosion at Didion Milling in Cambria, Wisconsin, was driven by poor hazard recognition, inadequate fugitive dust management, missing dust hazard analyses and weak safety leadership; the CSB recommended NFPA update guidance (resulting in NFPA 660) and again urged OSHA to adopt a comprehensive combustible‑dust standard.

A preventable disaster at Didion Milling claimed five lives in 2017, exposing critical failures in safety leadership and dust management that could have been avoided.

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