Cobb County is reviewing Sterigenics’ fire safety plan and could require the plant to remain closed pending upgrades to its Smyrna-area facility.

Until recently, the medical sterilization plant, which uses ethylene oxide, a combustible, carcinogenic gas, was listed with the fire marshal as a storage facility.

Since Sterigenics closed in August to install new pollution controls, Cobb has reclassified the plant as high hazard industrial.

That category comes with its own specific requirements for things like emergency exits and automatic fire suppression systems.

The county is preparing to send notification to Sterigenics.

"The letter is just a formal notice to Sterigenics that the county is basically going to keep them closed until we're certain that they've met all the county code requirements and the fire marshal requirements," Commissioner Bob Ott said in a video posted by the county.

Cobb will bring in a consultant to review fire safety standards at the plant.

Kevin Chambers of the Georgia Environmental Protection Division said building code and fire safety were county matters. He said a review of the relevant laws did not find any requirement for the EPD to conduct an environmental assessment based on the fire marshal’s classification.