WMUA provides wastewater treatment service to a significant portion of the towns of Manalapan, Marlboro, and a portion of Englishtown and Freehold Township. Formed in 1972 and jointly created by Manalapan and Marlboro, the WMUA provides service to over 25,000 customers.

The WMUA and its employees strive to provide the most efficient and environmentally safe wastewater treatment available at the lowest possible cost to its ratepayers.

The WMUA has 195 miles of sewer lines and 29 pump stations. The sewer treatment facility is located in Manalapan Township in Monmouth County. The plant is a tertiary treatment facility and has 14 Reed Beds.