Injuries and illnesses should be recorded on only one employer’s injury and illness log. 29 CFR 1904.31(b)(4).

In most cases, the host employer is the one responsible for recording the injuries and illnesses of temporary workers.

According to OSHA Release, injuries to Temporary workers go on the host employers, not the Temp Agency's OSHA 300.
According to OSHA Release, injuries to Temporary workers go on the host employers’, not the Temp Agency’s OSHA 300.

OSHA has released a new educational bulletin for staffing agencies and host employers on current requirements for recording injuries and illnesses of temporary workers. The new Recordkeeping Bulletin (PDF*), which is part of OSHA’s Temporary Worker Initiative, addresses how to identify which employer is responsible for recording these work-related injuries and illnesses on the OSHA 300 log.
“The Recordkeeping Bulletin is the first of many materials we are releasing and helps clarify which employers are responsible for reporting injuries and illnesses,” said Dr. David Michaels, assistant secretary of labor for occupational safety and health. “These materials will provide valuable information for both host employers and staffing agencies on how they can work together to make sure their workers are properly trained and protected.”
The temporary worker Recordkeeping Bulletin helps businesses determine which employer is responsible for recording work-related injuries and illness on the OSHA 300 log. For more information, read the news release and visit OSHA’s temporary worker page.