Which statement about the lift station's role is correct?

• A. They lift wastewater to a higher elevation for gravity flow through treatment.
• B. They disinfect wastewater on-site.
• C. They filter solids with a screen.
• D. They generate electricity.

Answer: (A)

Lift stations move wastewater uphill so it can flow by gravity to the treatment facility. They collect sewage in a wet well, use pumps to raise it to a higher elevation, and then the wastewater continues downstream under gravity to the plant. This is why the statement describing lifting wastewater to a higher elevation for gravity flow through treatment is correct. Disinfection, screening, and electricity generation are handled at other parts of the system—disinfection happens at or after treatment, screening removes solids during initial treatment rather than at the lift station, and generating electricity is not a typical function of a lift station.