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Old 05-24-2014, 07:18 AM   #1
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Dumping tanks in to a septic system

We are downsizing our house and moving in to a place with a large insulated barn for our MH.

The new home has a septic system. I have heard dumping the MH tanks in to the septic system is no big deal, but I have never had a septic system and am unsure.

Any thoughts?

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Old 05-24-2014, 07:24 AM   #2
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I've been doing it for years with no side effects...I did have my septic tank emptied and checked after 15 yrs. I told them what I was doing and they said it shouldn't be a problem.

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Old 05-24-2014, 07:30 AM   #3
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I would skip using any tank treatments if you use them and use septic system safe TP. Other than that its the same thing that goes in from the sticks and bricks house.
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Old 05-24-2014, 07:38 AM   #4
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Iv had septic tank for years...yes, they can handle the contents of your holding tank. However......
Remember the common sense restrictions: don't drive over your drainage field, how old is you system? Is it working? Slow? Nothing but #1 and #2, strong chemicals will kill your septic tank bacteria, fill the septic on the fill side if it is a two stage tank, close and lock access ports.

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Old 05-24-2014, 07:42 AM   #5
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I usually dump mine before I get home but I have dumped into our septic before. No resulted problems. When I put in our rv pad I tapped into the septic line before the tank and ran a line over to the pad for just such use.
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Old 05-24-2014, 08:22 AM   #6
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I dumped @ my brothers he has a septic system and I just backed up to the pvc pipe, opened it and dumped. He says he had no problems. This was last year.
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Old 05-24-2014, 08:41 AM   #7
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Seems like a full load 30/35 gallons at one time could overwhelm a tank. My Sister-in-Law has offered when we stay at her lake house, but I have been afraid of screwing it up.
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Old 05-24-2014, 08:43 AM   #8
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The biggest problem with dumping tanks to a speptic is the size of the septic v/s the size of the Motor Home.

I have seen some very small Septic tanks, and some very LARGE motor home tanks.. This is not a good mix.. in fact sometimes the MH can "Swamp" the Septic, completly over filling it.

Also, you need to make sure you dump UP-STREAM of a trap. Septic systems do not work if open to air, at least not underground ones.

Other than that.. No problems anticipated.

one thing that can help.. If the septic is of limited capacity, dump with a macerator and only run it for a couple minutes per day till the MH tank is empty.. This will spread it out and let the system process it out
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Old 05-24-2014, 08:55 AM   #9
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In our neighborhood, an RV dump station is a common add-on. We are all on well/septic systems and there is a fair number of RVs. Around here, the septic tanks are all at least 1000 gallon by code, and usually several hundred feet from the house. The guys that come around to pump the tanks park their rigs where some of the neighbors actually store their motorhomes. Under these circumstances, I just can't see any reason why it would be a problem. Even if you use Happy Camper or Rid-X in the RV, it's OK to combine that in the septic tank. \ken
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Old 05-24-2014, 12:50 PM   #10
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Even our measly 500 gallon septic handles a 40+ gallon load from the coach OK. It probably does force a lot of liquid into the leach field in the short term, so a poor (slow draining) leach field might result in a temporary back up into the house main drain line. Not gonna happen in a properly working system, but you might find a previously unknown problem about to happen.
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Old 05-24-2014, 03:01 PM   #11
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Several years ago I asked our "septic guy" if I should be adding any treatments and he said it wasn't necessary but it wouldn't hurt to mix a couple of those small yeast packets in a cup of water and pour down the drain once or twice a year. I've been using that septic system about 14 years for home and RV without apparent problems.
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Old 05-25-2014, 08:28 AM   #12
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I have been dumping my RV into my home septic tank for 19 years with no issues.
I did have to pump tank about 5 years ago.
Never gave any consideration to TP in house or RV. Used many different kinds of holding tank solutions.
We do use RidX once a year in the septic system.
Tank size is unknown but I would guess at least 500 gallons.
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Old 05-25-2014, 06:01 PM   #13
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Rid-x will break up the top scum layer and allow those larger particles to exit to your drain field. I would not use it it.

A full RV tank can overfill your septic tank which could push solids into the second chamber if you have one which will allow such solids to go to the drain field.

I would use caution if dumping a full black tank into your septic system. Perhaps half now and half the next day.
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Old 05-25-2014, 06:36 PM   #14
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Just as doing all the laundry on the same day can overload a septic system, so can full black and grey tanks. The key here is I said septic system - not just septic tank.

That's why I have a separate tank for the laundry.

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