Ontario Hot Mix Producers Association (OHMPA), formed in 1974, provides a voice for hot mix asphalt producers on all subjects affecting our industry or our member's businesses. Members include all of the major producers across Ontario and a solid core of supportive manufacturer/supplier members. OHMPA is recognized as the authoritative voice of the asphalt producing industry in the province of Ontario. OHMPA's vision: Dedicated to Excellence in Asphalt Pavements