Red Seal Plumbing Practice Exam

A sewage lagoon is a man-made body of water used for the treatment of raw sewage. It is designed to break down and remove contaminants from the sewage, leaving behind a more purified liquid. The other options, an industrial lagoon, treatment lagoon and aeration lagoon, are incorrect because they do not specifically refer to the use of raw sewage in the lagoon. An industrial lagoon may be used for various industrial processes, a treatment lagoon may receive treated wastewater or stormwater runoff, and an aeration lagoon may be used to add oxygen to a body of water. Only a sewage lagoon is directly supplied with raw sewage for treatment purposes.