This paper describes some common corrosion problems in water treatment plants due to dissimilar metal corrosion cells, some thoughts on the use of nonmetallic materials and stainless steels, and unusual failure of a turbine pump column pipe, suggestions for determining the corrosion status of an existing plant, and a procedure for having corrosion problems properly addressed on proposed treatment plants. The purpose is to increase awareness of corrosion problems and solutions that affect the integrity and longevity of water treatment plants. Water and soil are corrosive, at least to some degree, to the metals they contact, but the most severe corrosion problems are often man- made. The most common one is the dissimilar metal corrosion cell.