Norwalk Tank Company sells precast concrete products for the underground storm water and wastewater industries. The company provides manholes, flared end sections, septic tanks, home sewage treatment systems, catch basins, and grease traps to residential customers, commercial / industrial customers, wholesalers, strip malls and fast food restaurants throughout Illinois and Indiana. We are also the producer/manufacturer of Redi Rock retaining walls and precast Pole Base foundations.