The Panhandle Milling explosion killed one worker and critically injured three others at the company’s flour mill in Dawn, Texas, in the early morning hours of July 23, 2025. OSHA later issued three serious citations totaling $39,721 for dust, alarm, and ignition-source hazards, and Panhandle Milling is contesting all three.
What Happened at the Dawn, Texas Mill
The blast tore through the facility at 4805 FM 809 in Deaf Smith County, causing a partial building collapse and igniting a grass fire outside the plant.1MyHighPlains. Early Morning Explosion at Panhandle Milling Leads to Multiple Victims One worker was found dead in the debris. Three others were taken to area hospitals with burn injuries.2Amarillo Globe-News. 1 Dead, 3 Injured in Panhandle Milling Explosion in Dawn, Texas
The worker who died was Melissa Yvonne Mungia, a 36-year-old packaging operator from Hereford. She was pursuing a business degree at Amarillo College and left behind three young daughters.3Mendez and Mullins Family Funeral Home. Melissa Yvonne Mungia Her family held a celebration of life on July 29, 2025, and a niece organized a GoFundMe campaign for the children.4NewsChannel 10. Family Releases Statement After Woman Dies in Panhandle Milling Explosion
Hereford Fire Marshal Todd Murray said soon after the explosion that he suspected grain dust as the cause, though no official determination had been made. Structural instability initially kept investigators out of the site.5ABC 7 Amarillo. OSHA Investigating Cause of Flour Mill Explosion, Grain Dust Suspected A company representative declined to answer questions in the days that followed, and the Deaf Smith County Sheriff said he had not heard from OSHA or the company.4NewsChannel 10. Family Releases Statement After Woman Dies in Panhandle Milling Explosion
What OSHA Found
OSHA opened a fatality and catastrophe inspection the day of the explosion. Six months later, on January 22, 2026, the agency issued three citations, all classified as serious, with combined penalties of $39,721. The agency said the cited conditions “created hazardous conditions that may have contributed to the deadly explosion.”6EHS Careers. Panhandle Milling Contests OSHA Fines After Fatal Explosion
The violations covered three problems familiar to grain mill safety inspectors:
- The employee alarm system did not carry a distinctive signal for each purpose, in violation of 29 CFR 1910.038(d). Penalty: $13,902.7OSHA. Inspection Detail – Panhandle Milling, LLC
- Fugitive grain dust exceeding one-eighth of an inch had not been immediately removed from priority housekeeping areas, in violation of 29 CFR 1910.272(j)(2)(ii). Penalty: $13,902.8OSHA. Violation Detail – Citation 01002
- Workers were using compressed air to blow dust and unclog lines while nearby machinery capable of serving as an ignition source was still running, in violation of 29 CFR 1910.272(j)(3). Penalty: $11,917.9OSHA. Violation Detail – Citation 01003
Flour and grain dust are combustible when suspended in the air at sufficient concentrations, and OSHA lists agriculture and food production as the leading source of combustible dust fires and explosions.10OSHA. Combustible Dust
The OSHA inspection record also references two prior accident reports tied to the Dawn facility (activity numbers 2324053 and 2340066). No details about those incidents appear in the available records.7OSHA. Inspection Detail – Panhandle Milling, LLC
Panhandle Milling Is Contesting All Three Citations
On February 12, 2026, before the February 20 abatement deadline, Panhandle Milling formally contested every citation.9OSHA. Violation Detail – Citation 01003 The company has not publicly explained the basis for its challenge.11NewsChannel 10. Panhandle Milling Contests OSHA Violations After Accusations Made Day of Explosion
When an employer contests OSHA citations, the case moves to the Occupational Safety and Health Review Commission, an independent federal agency that hears these disputes. As of mid-2026, the inspection record lists the case as open and all three citations as contested. No OSHRC hearing date or decision has been posted.7OSHA. Inspection Detail – Panhandle Milling, LLC
Can Injured Workers or Mungia’s Family Sue?
No public reports in the available record show that Mungia’s family or the injured workers have filed a civil lawsuit against Panhandle Milling. Texas law does shape what such a suit would look like. Unlike other states, Texas does not require private employers to carry workers’ compensation insurance.12Texas Department of Insurance. Workers’ Compensation Employer Information Employers that opt out, known as non-subscribers, give up traditional defenses in negligence suits, including contributory negligence and assumption of risk. At a non-subscriber employer, an injured worker needs only to prove negligence to recover damages. Whether Panhandle Milling carried workers’ compensation coverage on the day of the explosion is not established in the available record.
What Happened to the Facility
In September 2025, about two months after the blast, Greenfield Milling announced that it was leasing certain former Panhandle Milling assets in Hereford to support its own flour production. Greenfield was founded in 2022 by the same co-founders behind Panhandle Milling’s parent company, PHM Brands, and now incorporates Panhandle Milling as a fellow subsidiary.13World-Grain. Greenfield Milling Debuts Flour Mill in Utah The Panhandle Milling website now identifies the company as “part of Green Field Milling.”14Panhandle Milling. Panhandle Milling