To which class of sewage systems do the operation and maintenance requirements apply?

• A. Class III only
• B. Class IV only
• C. Class V only
• D. Class III, Class IV and Class V

Answer: (D)

Operation and maintenance are required because every on-site sewage system relies on components and processes that can degrade over time, and regular care keeps the system functioning as designed. Class III, Class IV, and Class V systems each have distinct but related elements—tanks, pumps or dosing mechanisms, distribution networks, and soil absorption or treatment components—that can wear, clog, or fail if not properly maintained. Routine tasks like inspections, pumping, servicing alarms or pumps, and keeping records help catch problems early, prevent backups or overflows, and protect health and the environment. Since all three classes involve treatment and disposal of wastewater, maintenance requirements apply to all of them, not just one.