A Wastewater Treatment Mechanic performs a variety of skilled tasks in maintaining, overhauling and assembling mechanical equipment and auxiliaries associated with combustion equipment, boilers, cryogenic equipment, large diesel engines, pumps, compressors, barscreens, collectors, clarifiers, centrifuges, conveyors, heat exchangers, emissions control equipment, and other equipment found in a wastewater treatment plant or a wastewater collection system; or performs the more difficult and skilled mechanical work with limited supervisory responsibility over a small crew.