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Old 09-25-2022, 12:09 PM   #1
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Black Water Holding Tank

Is it OK to keep a few gallons of water in my black water holding tank over the winter?
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Old 09-25-2022, 12:20 PM   #2
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If you perform a winterization process, due to freezing temps, you'll likely include some RV Antifreeze down the toilet... so it should be okay for some content in the tanks. If there's a lot then you may want to dump all your tanks, just for best practices cause they can get pretty nasty. Here's a map of RV Dump Stations
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Old 09-25-2022, 12:52 PM   #3
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Let's just say that isn't a standard practice for cold climates. If the valve holding back that 'water' cracks, you will not be happy. Dump and winterize properly would be my recommendation.
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Old 09-25-2022, 03:55 PM   #4
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Winterizing means holding water/antifreeze mix in your system (mostly in lines) hoping the antifreeze doesn't get over powered by the temps. I have always completely drained all water lines and tanks and left every valve and faucet open and never had any issues. Granted I'm not in a cold weather location but it did get pretty cold here couple of winters ago where it got as as low as 10 degrees fahrenheit and stayed below freezing for about 5 days.
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Old 09-25-2022, 07:59 PM   #5
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If one leaves several gallons of water in their black water holding tank, that water will be sitting at the drain end of the tank where it's usually really cold. It may not only crack the valve, but will also crack the pipe.

No water in the poo tank!


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