Septic Tank Leach Line Length

In a conventional gravity system the pipe from the house to the septic tank and the outlet pipe from the tank to the distribution box or leach field should both slope downward with a minimum slope of 1 4 inch per foot.

Septic tank leach line length.

Iii the depth of the leachfield bed shall be between 18 and 30 inches below original ground level. Septic drainfield trench length. Start your search for the septic tank lines at the house. Trace the plumbing drain lines to the septic tank which is usually installed 10 to 20 feet from the home s exterior.

Find out if the hardware store offers equipment rentals so you can use an auger without having to pay the full price. Utilizing a center manifold system a bed may then have a maximum length of 200 feet. Heavy solids settle to the bottom of the tank while greases and lighter solids float to the top. Laterals for siphon dosing systems in beds are limited to 75 feet.

At the tank s end opposite the house the drain line leads to the leach field. If more than 100 feet is required then a distribution box with multiple lines will be needed. The maximum length of each lateral from a pressure manifold shall be 100 feet. The home s sewer line drain pipe needs to slope 1 4 inch per foot downhill to the inlet side of the septic tank and the outlet pipe needs to flow downhill at least 1 8 inch per foot downhill to the leach field where the septic tank effluent enters a manifold or distribution d box.

Some writers opine that the maximum septic trench line is 100 feet. A septic tank needs to be adequately sized so that the retention time the length of time that wastewater effluent remains in the tank before flowing to the drain field is sufficient enough to allow heavier solid particulates to settle to the bottom as sludge and lighter solids such as fats and oils to float up to the top of the tank. Guide the first 1 2 feet 30 61 cm of the line into a pipe in your leach field. 1 inch in 3 minutes sandy soil.

1 inch in 48 minutes clay soil. The solids stay in the tank while the wastewater is discharged to the drainfield for further treatment and dispersal. Sewage lines should slope downward to the septic tank and drain field at min. You can buy a mechanical auger from a hardware store or online.

A buried watertight tank designated and constructed to receive and partially treat raw domestic sanitary wastewater. The maximum length of a trench is typically about 150 feet but we have found installations that were three times that length. Check the natural slope of the land to locate the leach field. A realistic answer is it depends on site and soil conditions.

Contact environmental health for guidance.