The OSHA HAZWOPER Refresher course is an annual 8-hour training course designed in accordance with 29 CFR 1910.120 and is required for HAZWOPER-certified workers who perform clean-up operations or other activities that expose them or could expose them to hazardous substances, including hazardous waste. Course topics include a regulatory review, toxicology, hazard recognition, health and safety considerations, personal protective equipment and respiratory protection, confined space entry, medical surveillance and emergency procedures.