Which phrase correctly describes residential wastewater?

• A. Normal/Regular
• B. Sanitary/Domestic
• C. Aerobic/Drainage
• D. Septic/Anaerobic

Answer: (B)

Residential wastewater is best described as sanitary or domestic because it comes from homes—toilet, bathroom, kitchen, and laundry waste—and is collected in sanitary sewers as sanitary/domestic waste. This terminology distinguishes it from stormwater runoff and most industrial effluents, focusing on the source as a household. The other phrases don’t fit: Normal or Regular is too generic and not a formal wastewater category; Aerobic/Drainage points to treatment methods or rainwater drainage rather than the type of waste itself; Septic/Anaerobic describes a specific treatment process (an anaerobic septic system) rather than the general nature of all residential wastewater, since not all homes use septic systems and many are connected to centralized treatment.