Septic Tank Drainfield Depth

Septic tank and drainfield drawn on plot plan.

Septic tank drainfield depth.

A typical septic drainfield trench is 18 to 30 inches in depth with a maximum soil cover over the disposal field of 36. The system includes the septic tank and a leach or drainage field. Septic drain fields also called leach fields or leach drains are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank organic materials in the liquid are catabolized by a microbial ecosystem. A septic drain field a septic tank and associated piping compose a septic system.

Numerous standards exist for the installation of the field including the depth of the pipes. Septic drainfield trench depth specification. 1 inch in 48 minutes clay soil. For the sake of making a quick check assume the drainfield will have two laterals 150 feet long 10 feet apart.

Effluent from the septic tank flows to a pump chamber where it is pumped to the mound in prescribed doses. Septic tank design depth septic tank freeze protection. Or per the usda 2 feet to 5 feet in depth. A typical septic tank and drainfield will consist of a 12x8 foot septic tank and a drainfield.

Each drain field trench should be at least 3 to 4 feet wide and 3 to 4 feet deep. There should be at least 100 feet of drain field for a 1 000 gallon septic tank. Plot plan showing septic tank drawn on it. Mound systems are an option in areas of shallow soil depth high groundwater or shallow bedrock.

The constructed sand mound contains a drainfield trench. At references we cite these sources. Here we describe the depth at which septic tanks are installed and we explain the use of septic tank risers to make it easier to pump out clean or service deeply buried septic tanks. This can be accomplished by making four trenches 25 feet long or two trenches 50 feet long.

For homeowners outside the system normally in rural areas a septic system installed on the property is the only alternative. To what depths are septic tanks or cesspools or seepage pits or drywells commonly buried.