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Old 05-15-2009, 10:47 AM   #1
1 Rivet Member
1986 Argosy
bolinas , California
Join Date: May 2009
Posts: 5
Question Black water holding tank changes for using trailer as stationary home/external septic

Has anyone had experience in changing the plumbing configuration of a trailer so that the toilet and solids go into an external septic tank rather than into the built in black water tank? I am going to use the trailer as a stationary home (It is not going to be towed around much) and I want the toilet solids and liquids to pass into the exteral septic tank rather than into the black water storage tank. The black water storage tank is designed to be emptied when its volume reaches 1/2 to 3/4 full, and then flushed out. I'm thinking to modify the plumbing so that I don't have to deal with the fulling and emptying of the tank.

Any suggestions?

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Old 05-15-2009, 11:18 AM   #2
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1956 22' Safari
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Conifer/Evergreen , Colorado
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Arrow These trailers are made for travel~

Hmmm...trailers in the 50's & earlier didn't have holding tanks, they were called "park models". They were either plumbed directly into a RV park system or "golpher-holes" were used. I suppose you could remove your tank and plumb directly into the septic tank with your '86 but I am pretty certain this would adversely effect your resale value. We just went to great lengths & $1500 to ADD tanks to our '56 trailer that didn't have them. Without tanks, it would limit the travel-ability of the trailer for you (or a future owner) at a later date.


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Old 05-15-2009, 03:58 PM   #3
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Austin , Texas
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You could install a marine toilet which pumps the effluent to it's storage location rather than using a gravity fall into the tank toilet. The toilet outlet hose could be run anywhere.
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Old 05-20-2009, 07:34 AM   #4
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1975 Argosy 24
Malakoff , Texas
Join Date: Apr 2009
Posts: 490
If that is what you want to do....get the black holding tank
out of the way(keep for later)....replace the flange under the tiolet
with standard flange and sched40 pvc to the septic.....prop up
the sched40 so that it is NOT hanging from the trailer. It may not
be Kosher(or favorable in the setting of an excellant forum)...but you
can do as suits your careful not to do any permanent
changes....modify in such a way that it could all be put back aright.
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