The water piping in my house is plastic instead of the commonly used copper piping. Does that increase the risk of contracting the Legionella bacteria?
Various plumbing materials have been evaluated for their ability to support the growth of Legionella (and other bacteria). Copper pipe is inhibitory, whereas plastic (PVC) pipe will support the attachment and subsequent growth of bacteria- including Legionella. If the hot water system temperature is maintained at or above 130oF, growth will be inhibited regardless of pipe materials.