CONTECH Construction Products wants water, not profits, to go down the drain. The company makes and distributes site-specific civil engineering products related to storm water management, earth stabilization, erosion control, and wall and bridge structures. Products include retaining walls, precast concrete bridges, plastic and metal drainage pipes, and storm water filtration systems. CONTECH sells to builders of commercial, industrial, and public projects, as well as large-scale residential communities. It has dealers, distributors, or manufacturing plants in all 50 US states, as well as a national sales and project consultant organization. Goldman Sachs Mezzanine Partners (GSMP) took control of CONTECH in 2010.