The box asking for your RMP# appears in step 4 of the reporting process. The Environmental Protection Agency (EPA) assigns a 12-digit number to RMP#’s. Contact the EPA RMP Reporting Center at (703) 227-7650 or e-mail at RMPRC@epacdx.net, available from 8:00 AM to 5:30 PM (ET), Monday through Friday. Click here to contact the EPA: https://www.epa.gov/rmp/forms/contact-us-about-risk-management-plan-rule