Conventional systems do not require a maintenance agreement, and homeowners should be wary of companies selling one.

Routine pumping every 3–5 years is the primary ongoing requirement. A “sludge judge” measurement should be taken every 2–3 years to determine when pumping is due.

If the system shows signs of improper function during pumping, a certified professional should evaluate the tank, baffles, and lateral field before the problem worsens.