According to OSHA, there are no specific training or certification requirements for HAZWOPER trainers.
The OSHA HAZWOPER FAQ states:
The “Hazardous Waste Operations and Emergency Response” standard (HAZWOPER), 29 CFR 1910.120, states in paragraph (e)(5) that “Trainers shall be qualified to instruct employees about the subject matter that is being presented in training”. In addition, 29 CFR 1910.120(e)(5) explains that the qualifications of the instructors may be shown by academic degrees, completed training courses and/or work experience.
At this time, OSHA does not have any specific requirements to certify an instructor. The subjects that trainers should be able to convey to employees at hazardous waste operations who need training are summarized in paragraphs (e), (p) and (q) of the HAZWOPER standard.