The MCUA's Solid Waste Division maintains and manages the 315 -acre Middlesex County Landfill in East Brunswick . The state-of-the-art facility features 44-groundwater monitoring wells, a double liner system, leachate and methane gas collection systems, and high-tech monitoring systems. Among the Authority's most significant achievements was the development of an environmentally sound and economically efficient landfill gas-to-energy system, in which greenhouse gases collected at the landfill are used to create 16-megawatts of electrical energy for use in the Authority's facilities.

The MCUA's Solid Waste Division is an industry leader in solid waste management and operates the Landfill with the highest standards of environmental and community consciousness. The Authority provides solid waste management service to over 750,000 residents of Middlesex County. Every day approximately, 245 trucks transport approximately 2,450 tons of garbage to the landfill, which amounts to over 600,000 tons per year. The waste at the landfill is managed by applying organic cover material daily, at intermediate levels, and enclosing the landfill with a final cap cover when it reaches capacity. The Middlesex County Landfill has an estimated acceptance capacity of 20 million cubic yards of solid waste.