Building over septic tanks.
It is never recommended to build a structure over any portion of your septic system. It is not uncommon to find tanks located under a wooden deck, pool patio, driveways, or even room additions. Most of the time, this happens because the homeowner is unaware of the tank location and/or does not plan for future maintenance on their tank.
Building over drainfields.
The soil beneath the drainfield needs oxygen so that the microbes in the soil can treat the effluent from the drainfield. However, if a permanent structure is built over a drainfield it can restrict the oxygen flow into the soil and restrict the evapotranspiration process. A big risk to building over the drainfield is causing the lines to collapse. Also, the soil can compact around the trenches, which may not allow for percolation.
It is never recommended to build a structure over any portion of your septic system. It is not uncommon to find tanks located under a wooden deck, pool patio, driveways, or even room additions. Most of the time, this happens because the homeowner is unaware of the tank location and/or does not plan for future maintenance on their tank.
Building over drainfields.
The soil beneath the drainfield needs oxygen so that the microbes in the soil can treat the effluent from the drainfield. However, if a permanent structure is built over a drainfield it can restrict the oxygen flow into the soil and restrict the evapotranspiration process. A big risk to building over the drainfield is causing the lines to collapse. Also, the soil can compact around the trenches, which may not allow for percolation.