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motorjock
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Reged: 09/29/02
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Loc: TX, Grayson Co.
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Shop Bathroom
06/05/03 12:25 PM
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I am putting a bathroom in my shop and need to tie the line into the septic system. My installer left me a "t" at the septic system to tie in. My question is does anyone know what size line I need from the toilet to the septic. I've heard 3 inch but don't know. This bath won't be used that much. Because of the elevation I also need to put a sump pump in for the line. If anyone has done this or has knowledge you comments would be appreciated.
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MarkV
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Loc: N. Georgia
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Don't know about the pump but 3" is the standard around here. If you go to big there is to much room for the liquids to flow past with out pushing the solids. To small and…………we won't go there. 
MarkV
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Chillimau
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Reged: 09/12/02
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Loc: Oklahoma
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3" is min. here in Oklahoma. What size is the T ?
Gary
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cowboydoc
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My bathroom in my barn is 3".
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motorjock
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Reged: 09/29/02
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Loc: TX, Grayson Co.
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Thats what I'm doing today, digging to the "T" and measuring it. I'm a rookie at all this, the good news is I do have a retired master plumber thats going to do the actual work, unfortunately he's traveling this week. Thanks for the help from everyone.
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motorjock
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Loc: TX, Grayson Co.
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Let me add a little kink to the deal. The connection coming out of the shop is 3". The "T" at the septic tank is 2" and all of the sump pumps that I have looked at have 2" connections. I"m thinking of doing a 3" to 2" reducer at the toilet and just running 2" all the way to the "T". Anybody think this might be a problem. As I said earlier, this won't be used very much. Thanks in advance for your replies.
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chevdog
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I'm surprised that the installer left a 2" tee for the bathroom connection - I have never seen anything less than 3" for anything that services a toilet. I've also got a bathroom w/shower plus an extra hand sink at the workbench area in my shop. The bathroom is a 3" main line, with the hand sink line 2".
Just a suggestion, but I would remove the 2" tee on the main sewer line (I'm assuming that the main sewer line is 3") and install the proper size tee. I really don't know if you can get by with a 2" line from the bathroom, but I doubt it.
Nick
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LazyJ_Arabians
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Reged: 09/16/02
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Loc: Central Arkansas
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I'd put in a separate septic system before I messed with a pump. Use a distribution box for a tank and lay out 80' of perf pipe and forget about it, unless you have strict code enforcement.
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Re: Shop Bathroom
[re: chevdog]
06/14/03 06:23 AM
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<<<<Just a suggestion, but I would remove the 2" tee on the main sewer line (I'm assuming that the main sewer line is 3") and install the proper size tee.>>>>
As Chevdog stated you should remove the smaller tee and go with the proper size to match the main line. Here in Maryland the plumbing inspector made me put in 4 inch line from the barn to the septic. Of course only after I bought about 100 feet of 3 inch PVC.   Next time NO PERMIT! 
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MelonHead
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Does anybody know what slope is required for a sewer line to the septic?
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DocHeb
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Loc: Michigan
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From your description it sounds like your line from the bathroom is 3", and you want to use a septic field that is higher in elevation than the workshop bathroom. I suspect you will be using a sewage ejector pump, not a sump pump. The sewage ejector pump accepts sewage from a 3" line, chews up solids, and then ejects through a 2" line. I believe the 2" 'T' your tank installer used is correct. You will also have to be sure the ejector pump is vented. I would buy the proper pump and determine pipe sizing before you invest much time in plumbing new lines or ripping out old.
Chris
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Bird
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If you're talking about the line from the house to the septic tank, I think a minimum of a quarter inch drop per foot of pipe is the recommended standard. But someone else may know more than I, and if so, feel free to correct me.
Of course if you're talking about the lateral lines; i.e., the perforated pipe in the drain field, you certainly do not want that much slope. I'm not sure but think it may be a maximum of a quarter inch per 10' of pipe.
Now someone else tell me if my memory is still working. 
Edited by Bird (10/02/03 06:25 PM)
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bgott
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It all depends on your code and inspection situation. 1/4" per foot is considered optimal, 1/8" per foot is acceptable. I have a line I put in at 1/4" per 10 feet over 50 feet and I haven't had a problem from it in 5 years. When I asked the local water district inspector what he looked for in the way of drop he told me " some drop". We have a lot of very high sewer lines around here and a lot of times they won't support 1/4" per foot. The biggest reason for 1/4 " per foot drop is that no matter how well you bed the pipe when you install it the ground can shift and give you high spots in the pipe. 1/4" gives you a little room for error.
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MelonHead
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Re: Shop Bathroom
[re: bgott]
10/05/03 07:39 AM
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Thanks for the info!
Here's another, related question.
I'm wanting to tie a line into my existing septic for a sink and 1/2 bath in a studio I'm going to build for my wife. I think that with a 1/4" per foot, the studio will be plenty close to the septic.
I have a decent idea where the sewer line is that comes from the house because there is a cleanout in the front yard about 30 feet from the septic tank.
So if I go out and start digging (with a shovel, not a back hoe!) on the cut-out side of the septic tank looking for the where the sewer line enters the tank, is there any risk that I'll hit the field lines _first_? Are the field/lateral lines lower or higher than the sewer line? Anything I need to watch out for?
Any problem with just putting a tee in the sewer line and piggy backing the one septic for both the house and studio? We'll not overload the septic tank as there's just the two of us and the studio bath will be for occasional use only.
I ask about the chance of hitting a field line first because I don't know where mine are! I bought the house used and don't know what direction the field lines run from the tank. We've never seen any of the tell-tale "nice gree strips of grass" to give us a hint where the field lines run...
Many thanks.
What a great forum!
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GaryM
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Loc: Warrenton, MO
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In my area, Warren County Missouri, the Health Department signs off on all septic installations. This includes a drawing of the tank location and field location. You might check with the Health Department in your county or city to see if they have any records. At the very least they might have a record of who installed the system, and they might have a diagram.
Gary
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Hey! Aren't you supposed to be working?
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