Cabin Septic System

Cabin Septic System

Every good cabin needs a good septic system.

The cabin septic system was built for limited use by two people and mostly just weekends. There are two parts, the holding/digesting tanks (two 55 gallon barrels) and the dispersal field.

Digging the hole.

Dig a hole so that the first barrel sets about 4 inches below grade. Next to the first barrel, dig a hole about 12 inches deeper for the second barrel. Make sure the barrels are on level ground. Don’t eye-ball it, pull out the level and check.

two 55 gallon barrels

Use gravel to level if necessary.  In the first barrel, we cut an opening in the top for the incoming sewage and one on the side to feed the second barrel. The second barrel had an cut out on top to receive the pipe from the first barrel and two holes on the side (near the top) to flow into the field.

Next we connected the two barrels  with a 4″ ABS pipe. Cut the pipe, do a dry fit of all pieces before gluing it together.

On top of the first barrel cut an opening and fitted it with a “Y”. Add a 45 degree bend to the “Y” so the sewer line from the cabin can be connected to the septic system.

Then we put in gravel for the bottom of the dispersal field line (10 feet long) with a 1/4 inch drop per foot away from the barrel. After adding a couple of perforated drain pipe coming out of the second barrel, we double check the fall of the pipe.

We connected the system to the sewer line coming out of the cabin. Once everything was fitted, glued, and dried, we filled the first tank with water.

Last step was putting gravel over the top of the perforated pipes and topped with landscaping fabric. This was to prevent dirt from falling into the gravel.  Fill with dirt to bring it all up to grade.

 

Voila – the wife has indoor plumbing.

Supply List:

9 – Cubic yards of 3/4 or 1 1/2 crushed rock

80 Square feet of landscape fabric

Two 55 gallon plastic drums

10 ft of 4″ ABS plastic pipe

1-4″ ABS 90 degree bend (sometimes called a street Ell)

1-4″ ABS Y branch (sometimes called a Y bend)

3-4″ ABS 45 degree bend

4-10 ft. length of 4″ perforated drain pipe

2-4″ drain pipe couplers

2-4″ toilet flanges

Level

10- Wood Stakes

Set of PVC glue

Two part epoxy or silicon sealant

1″ thick wood block

Duct tape

4″ ABS removable cap for pump out when needed

 

There are plenty of how-to articles on the web if you decide to do your own septic system. (i.e. WikiHow)

If you have any questions, please leave them in the comment section and we will try to answer them.

 

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