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Question DetailsAsked on 12/26/2017

when portable dishwasher drains water comes out of water heater overflow at ground level

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1 Answer


Then its drainage must be leading into the same drain as the water heater overflow, so sounds like you have a blockage in the drain line BELOW/BEYOND the point where the dishwasher drain meets the water heater overflow. Or they are both just discharging right outside the foundation and it is polling and backing up - not a good thing for the foundation to have pooling there if that is the case.

If not backing up when using basins or flushing toilet or showering, then the blockage is in a branch of the DWV (drain, waste, vent) piping serving the dishwasher drain (or sink if draining into there). Snaking should be able to clear that.

If overflowing with any substantial water use in the house, then blockage is in the main portion of the sewer line heading to the street or septic tank. While snaking might free it up, generally I recommend full-diameter routing or jettting (preferably with on-board camera to prove it got it clean because jetting tends to have skips many times). The in-ground portions (low-slope runs) especially tend to accumulate soap scum, fibers, and grease buildup which gradully reduces the inside pipe diameter, and needs routing/jetting out every 5-20 years depending on household hot water use (good) and amount of grease and hair going down the drains (bad).

For in-house snaking a Plumber is the usual Search the List category - for the whole sewer line normally a Sewer and Drain Cleaning outfit is what you need, though some plumbing outfits (usually bigger ones) have the larger equipment for long runs.

Answered 2 years ago by LCD

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