Building A Deck Over A Drain Field

Usually decks are allowed over drainfields as long as the piers of the deck are at least two feet from the drainfield trenches and as long as the deck footings do not support a roof.
Building a deck over a drain field. Because of the moisture levels and the need for free air movement no permanent structures. Also the soil can compact around the trenches which may not allow for percolation. However if a permanent structure is built over a drainfield it can restrict the oxygen flow into the soil and restrict the evapotranspiration process. If you have a septic system and want to add a deck to your house or build a shed in your backyard you should consider the consequences carefully.
The lack of regular pumping of your tank will be a costly mistake which can also affect you again when you sell. Building a permanent structure over the tank or drain field is usually a bad idea. Most zoning ordinances will require that you maintain at least a 5 setback from an underground septic system. The biggest issue that can arise from construction near a drain field is the damage caused by heavy construction equipment.
Building near a drain field leach field if a drain field is damaged it can cost a lot more to replace. Building over field lines. A big risk to building over the drainfield is causing the lines to collapse. With structures such as decks.
If constructing over field lines it is imperative that no foundation is dug. Building a deck over a septic tank it is usually not a good idea to build a deck near or on top of a septic tank. Here are three things to know in advance.