Septic systems require consistent maintenance to continue to work properly and function as designed. Septic tanks should be pumped out every two to four years depending on use, and the outlet baffle/filter checked and replaced or repaired as needed at this time, The disposal field area should be maintained by regular mowing if grass covered. Bark mulch covered disposal fields should be maintained by annual removal of any bushy or woody growth to prevent plants from rooting into the pipes or proprietary disposal devices.