These improvements provide easy access for tank inspection and pumping. By helping to keep the solids in the tank, the outlet filter helps prevent drainfield clogging and extends the life of the drainfield. My septic system tank has only one access port in the middle. You will only be required to install risers if it is practicable. Most tanks can be retrofitted with some type of riser or filter, using one riser if necessary.
Risers save money over the long run.
Only new tanks being installed will be tested for water tightness. Only major repairs requiring a DEM permit will require you to upgrade your system to the T1 or T2 level. Under State DEM regulations you would be required to put in a new system. Under the zoning amendment, you must upgrade to the T1 or T2 treatment level required for your site conditions and your area. DEM repair permits are issued for a one-year period.