OSHA Cites Maine Pulp Mill Nearly $800K After Two Workers Die from Hydrogen Sulfide Exposure

What Happened at Woodland Pulp

On January 27, 2026, workers at the Woodland Pulp mill were carrying out a cold weather shutdown — a decision the CSB attributes to a large increase in natural gas prices — when they were exposed to uncontrolled, high concentrations of hydrogen sulfide gas. Two employees died: Kasie Malcolm, a 20-year-old chemical engineering co-op student, who died the next day, and Allen Hornberger, a 26-year-old chemical engineer, who died February 16. Ten additional workers were exposed and reported symptoms such as burning eyes and throat and headaches; none was hospitalized, according to the CSB.

According to the U.S. Chemical Safety Board's (CSB) investigation update, the release occurred after the mill's Bleach Plant scrubber fan — the system that normally removes toxic gases — was turned off at about 11:40 a.m. as part of the cost-driven shutdown. High-pH process fluids containing sulfur compounds entered the acid sewer system, where automated controls added sulfuric acid to manage pH levels. The chemical reaction between the acid and sulfur compounds generated lethal concentrations of hydrogen sulfide gas.

The CSB found that the Kraft Mill building had no system providing building ventilation during either normal operations or shutdowns, and no stationary H₂S detectors or alarms were installed in the affected area. The gas migrated into the mill building through holes and open pipes in the process equipment. Workers were not equipped with personal hydrogen sulfide monitors. The company also lacked a system for tracking employee locations during the shutdown; the victims were not found until about 6:15 p.m.

A Separate Chemical Fire Compounded the Investigation

OSHA's investigation also covered a March 7, 2026 chemical fire at the same facility. In that incident, Woodland Pulp released 4,400 gallons of 50 percent hydrogen peroxide, which mixed with wood pulp that had accumulated on the ground and ignited. While no fatalities occurred, the fire underscored broader chemical management failures at the facility.

The Citations: Four Willful and Eight Serious Violations

OSHA issued a total of twelve citations against Woodland Pulp across two inspections, proposing $794,456 in penalties — $612,392 for the fatality inspection and $182,064 for the fire inspection, according to OSHA's inspection records.

Four willful citations — the most severe category, each at the $165,514 maximum — for:

• Exposing workers to deadly hydrogen sulfide gas levels without proper alarms or breathing devices (cited under the HAZWOPER emergency response provisions, 1910.120(q), and the air contaminants standard, 1910.1000)
• Allowing overflow wood pulp to build up in storage areas, creating hazardous conditions (1910.176(c))

Eight serious citations for:

• Lack of worker training on hydrogen peroxide risks (1910.1200)
• Failure to conduct medical evaluations and fit tests for respirator users (1910.134)
• Neglecting to label chlorine and acid lines (the pulp, paper, and paperboard mills standard, 1910.261)
• Failing to adequately control hydrogen sulfide exposure risks (1910.1000 and 1910.120)

Notably, OSHA did not cite the permit-required confined space or process safety management standards; the CSB notes the mill and OSHA had previously agreed the site was not covered by the PSM rule.

Under current OSHA penalty schedules, a willful violation carries a maximum penalty of $165,514, while serious violations can reach $16,550 each. Employers have 15 business days after receiving citations to comply, request an informal conference, or contest them — which Woodland Pulp did.

A Troubling History of Safety Violations

This was not Woodland Pulp's first brush with OSHA. The facility has been inspected 13 times since 2017, resulting in 13 serious and one other-than-serious citation. Notably, a 2017 inspection was triggered when 14 employees were hospitalized after a chemical exposure in the same area covered by the current investigation. The repeated pattern of citations and chemical incidents at a single facility illustrates what OSHA calls a culture of noncompliance — where known hazards are tolerated rather than addressed.

Understanding Hydrogen Sulfide: A Silent Killer

Hydrogen sulfide (H₂S) is a colorless gas recognized by its distinctive rotten egg smell at low concentrations. It is heavier than air and collects in low-lying and enclosed spaces. At high concentrations — the kind that killed the Woodland Pulp workers — H₂S paralyzes the sense of smell: OSHA's exposure table notes loss of smell at 100–150 ppm and death within minutes at 700–1,000 ppm, making the gas undetectable without instruments exactly when it is most dangerous. It is both extremely flammable and highly toxic.

OSHA's exposure limits for hydrogen sulfide under the general industry standard (29 CFR 1910.1000, Table Z-2) set a ceiling limit of 20 parts per million (ppm) and a peak limit of 50 ppm for no more than 10 minutes; the construction and shipyard standards use a 10 ppm time-weighted average. NIOSH recommends a 10 ppm ceiling over 10 minutes and considers concentrations at or above 100 ppm to be immediately dangerous to life and health (IDLH), while ACGIH's threshold limit value is 1 ppm as an 8-hour average with a 5 ppm short-term limit. The CSB's findings indicate that both workers who died were likely exposed to concentrations exceeding 500 ppm — five times the IDLH level.

H₂S is used or produced in numerous industries beyond pulp and paper, including oil and gas extraction, wastewater treatment, mining, and food processing. According to the Bureau of Labor Statistics, 46 worker deaths were attributed to hydrogen sulfide exposure between 2011 and 2017 across all U.S. industries.

What This Means for Employers

The Woodland Pulp tragedy carries urgent lessons for any employer whose workers may encounter hydrogen sulfide or other toxic gases. Here is what you should be doing now:

1. Install and Maintain Fixed Gas Detection Systems

Every area where H₂S may be present — including process areas, confined spaces, and adjacent buildings — must have stationary gas detectors with audible and visual alarms. Detection thresholds should be set well below OSHA's ceiling limit to provide adequate warning time.

2. Provide Personal Gas Monitors

Workers entering or working near areas with potential H₂S exposure should carry personal gas monitors. These devices offer a critical last line of defense when fixed systems are down or ventilation fails — exactly the scenario that proved fatal at Woodland Pulp.

3. Maintain Ventilation During Shutdowns and Process Changes

One of the central failures at Woodland Pulp was turning off the scrubber fan during the shutdown in a building the CSB says had no general ventilation system to begin with. Employers must ensure that ventilation and gas removal systems remain operational whenever toxic gases could be generated, even during non-routine operations. If a control must be shut down, alternative engineering controls and enhanced monitoring must be in place before workers enter affected areas.

4. Implement a Respiratory Protection Program

OSHA's Respiratory Protection standard (29 CFR 1910.134) requires employers to provide properly fitted respirators, conduct medical evaluations, perform fit testing, and train employees. Woodland Pulp was cited for failing on multiple fronts here — a gap that can quickly become deadly when atmospheric conditions change.

5. Train Workers on All Chemical Hazards

OSHA's Hazard Communication standard (29 CFR 1910.1200) requires that employees be trained on the hazards of chemicals they work with, including how to read Safety Data Sheets and labels. Woodland Pulp was cited for insufficient training on hydrogen peroxide risks. Employers should audit their training programs to ensure they cover every hazardous substance on-site, not just the most obvious ones — and, as this case shows, that training reaches interns, co-op students, and other short-tenure workers.

6. Track Employee Locations During High-Risk Operations

The hours-long delay in locating the deceased workers at Woodland Pulp is a haunting detail of this case. During shutdowns, startups, and any non-routine operation, employers should implement personnel accountability systems — whether digital check-in tools, buddy systems, or radio check protocols — so that every worker's location is known.

7. Audit Your Compliance History

Employers with a pattern of prior citations face heightened scrutiny and steeper penalties. If your facility has been cited before for similar hazards, treat that history as a red flag demanding immediate corrective action. OSHA's Severe Violator Enforcement Program (SVEP) targets employers with repeated or willful violations for follow-up inspections and enhanced enforcement.

The Bigger Picture: Chemical Safety Compliance in 2026

The Woodland Pulp case arrives as OSHA's chemical-safety rules are themselves in flux. The agency is holding virtual public hearings, which began August 19, 2026, on its July 2025 deregulatory proposals to ease respirator and medical-evaluation provisions in 16 substance-specific standards, among other changes. Whatever the outcome of those proposals, the general duty to control toxic gas exposures under 1910.1000 and to provide functioning respiratory protection is not on the table.

Meanwhile, the updated Hazard Communication Standard — aligned with GHS Revision 7 — has a key employer compliance deadline of November 20, 2026 for substances, by which employers must update workplace labels as needed, revise written HazCom programs, and train employees on newly identified hazards. For a comprehensive overview of what has changed and what is coming, BlueHive's 2026 OSHA Changes white paper provides a detailed compliance timeline.

Taken together, these developments signal that OSHA expects employers to take chemical safety seriously — not just on paper, but in practice. The agency's willingness to propose maximum penalties, as demonstrated in the Woodland Pulp case, underscores that willful disregard for known hazards will be met with the full weight of enforcement.

Key Takeaways

• Two workers died at a Maine pulp mill from hydrogen sulfide exposure during a cost-driven shutdown in January 2026.
• OSHA proposed $794,456 in penalties, including four willful violations — the agency's most serious citation category. The company has contested the citations.
• The facility had a decade-long history of safety citations and chemical incidents, including a 2017 incident in which 14 workers were taken to the hospital.
• Systemic failures — no building ventilation, a scrubber fan turned off, no gas monitors, inadequate training, and no personnel tracking — turned a manageable chemical hazard into a preventable tragedy.
• Employers must act now to audit chemical safety programs, install detection systems, maintain respiratory protection programs, and ensure safety controls remain active during shutdowns and process changes.

Sources

• U.S. Department of Labor News Release: OSHA cites Maine hardwood pulp mill (July 30, 2026)
• OSHA News Release: Woodland Pulp citations (Region 1)
• OSHA Inspection Detail: Woodland Pulp LLC, Inspection 1871206.015
• U.S. Chemical Safety Board: Woodland Pulp Investigation Update
• OSHA: Hydrogen Sulfide — Hazards
• OSHA: Hydrogen Sulfide — Standards
• OSHA: Hydrogen Sulfide — Evaluating and Controlling Exposure
• OSHA: Penalties
• OSHA: Respiratory Protection Standard (29 CFR 1910.134)
• OSHA: Hazard Communication Standard
• OSHA: Severe Violator Enforcement Program
• CDC/NIOSH: Pocket Guide — Hydrogen Sulfide
• Federal Register: OSHA Notice of Informal Hearings on Deregulatory Proposals for Chemical Standards (June 3, 2026)
• BlueHive: 2026 OSHA Changes White Paper