CSB links Bio-Lab Conyers fire and toxic plume to improper storage of reactive pool chemicals

What Happened

The US Chemical Safety and Hazard Investigation Board said a corroded sprinkler system and excess improperly stored reactive chemicals contributed to a massive fire and toxic gas release at a Bio-Lab pool chemical plant in Conyers, US, in September 2024.

The board said the incident catastrophically damaged the facility and led to its permanent closure. The smoke and gas plume lasted several days and exposed large areas to chlorinated and other hazardous compounds.

Why It Matters

For chemical storage and EHS teams, the report is a reminder that inventory control and sprinkler integrity are not separate issues: when both fail together, the consequence can escalate quickly from localized damage to community-level evacuation.

The report also shows how reactive materials can become a release source when exposed to water, especially if storage exceeds the designed hazard profile of the building.

Key Details

The CSB said the warehouse was built in 2019 to hold an “average inventory” of about 2,800 metric tonnes of raw materials, including oxidisers, but by the time of the incident it was storing over 6,000 tonnes of chlorinated isocyanurates and other reactive chemicals.

• The stored quantity was more than twice what the company initially indicated to local officials, according to the CSB.
• Water leaking from the damaged sprinkler contacted chlorinated isocyanurates and initiated decomposition.
• The resulting plume contained chlorine, hydrogen chloride, bromine, and other substances.
• No injuries were reported, but approximately 17,000 residents were evacuated.
• In April 2025, OSHA fined Bio-Lab more than $61,000 for safety violations and said the cause was improperly stored hazardous chemicals.

The CSB released its final report on July 21, 2026, tying the event to both mechanical degradation and storage practices that exceeded the site’s intended capacity.

What To Watch Next

Operators storing reactive pool chemicals or oxidisers will likely focus on rack density, segregation, and sprinkler exposure paths, especially where aging infrastructure could introduce water contact during a fire event.

Buyers and lab managers should review whether site inventories match the assumptions used in local filings, storage design, and emergency planning, particularly where the consequence of water contact can be severe.