If the site conditions are so poor that neither a conventional or alternative technology septic system can be installed, then a holding tank is the only viable option. A holding tank is a steel, water tight, tank, without any outlet. The typical size, for a private residence, varies from 2000 to 4000 gallons. All of the wastewater generated from the home goes into this tank, and once it is full it must be pumped out. The system is equipped with a high water alarm, audible in the house, to notify the residents when the tank is full.
The cost of installing a holding tank varies depending on the site conditions. Although a holding tank is significantly less expensive to install than an alternative technology system, it typically costs more to operate. Depending on water useage, the holding tank will have to be pumped up to several times a month