WRH Inc. is a general construction contracting company based in Amana, Iowa. WRH Inc. specializes in Waste Water Treatment, Water Treatment Plant, and Heavy Civil construction. Founded in 1973 as Wendler Engineering and Construction Inc., the company changed its name in 2007 to WRH, Inc. WRH Inc. self performs over 60% of projects built which include excavation, underground utilities, coffer dams, utilities, poured in-place concrete, pre-cast concrete, structural steel, carpentry, process equipment installation, and process piping.