GRESCO is a locally owned and established Guam company. GRESCO is comprised of several divisions including a Refinery, Environmental Division, LP Gas Products and Supply Division, Wastewater / Plumbing Division, Electrical Supply & Lighting Division, and LED Manufacturing Division each with a dedicated staff, equipments, and resources to address any of your needs.


GRESCO is a leader on Guam, the Marianas, and Micronesia in the proper management of Regulated Waste, Environmental Consulting, Site Assessments, Petroleum Transportation, Waste Oil Management/Collection/Mitigation, Wastewater Management/Collection/Mitigation, Bio-Fuel Production, LP Gas Supply, Electrical Supply, Lighting, and Chemical Supply. more...