A lagoon is a shallow, usually artificial, pond used for temporary or permanent storage of liquids. A stabilization lagoon is a shallow pond for the storage of wastewater before discharge to a stream or to a treatment facility. A sump is a stationary device designed to contain an accumulation of hazardous waste resulting from a hazardous discharge from a tank, container, waste pile, surface impoundment, landfill, or other hazardous waste management structure