This article provides information on predesign surveys and various testing associated with wastewater treatment plants. These include soil testing, atmospheric testing, and hydrogen sulfide testing. The primary parameters that influence the production of sulfides within the piping system that transports the wastewater to the treatment facility are discussed. The article describes the corrosion performance of various materials in the soil, fluid, and atmospheric exposures. The materials include concrete, steel, ductile iron, aluminum, copper, brass, stainless steel, and coatings used for wastewater facilities.