Existing system evaluations are available for a fee of $150. The evaluation is desirable for property buyers utilizing on-site sewage disposal systems to ensure the system is in good working order. An existing system evaluation includes a written description of the system, and judgment on whether the system construction is adequate.
Tank integrity, the presence of a baffle and overall size and depth of the system are taken into consideration. The absorption field is probed to determine if solids are beginning to limit capacity. When the system operation is questionable, the sanitarian will drill bore holes into the drainfield to determine if it is under pressure, or if a biomat is restricting infiltration.