It could be that some clothes were piled in such a way as to force water over the top of the tub.
Washers should have 2" drains, and the p-trap should be vented.
My washer unloaded its soapy water load on the floor after 7 years of use. I found the mess after the fact, so didn't see where the water was coming from. The washer was checked by a repair service and found to be OK and in good shape. The washer drains straight into a plastic pipe next to the washer, through the floor, with a 2' exposure under the house before entering the ground and running to a dry well. There is no vent or trap. I've run subsequent washer loads since this experience and have had no problem with the washer draining. Tis a mystery. Should I put in a vent or connect a runoff pipe to take up any possible future backup?
Since the water is just dumping onto the ground, you could connect the hose directly to a 2" PVC pipe using a rubber coupling and adapter to make the pipe size just large enough for the hose. Make the pipe vertical and as short as possible.
You would get the same effect, but less elegant in appearance and less permanent, if you use a generous supply of duct tape to seal the connection of the hose to the pipe.
When the washer pump shuts off the short pipe will not be able to maintain any siphon effect so it will not suck anything out of the washer.
The 2 inch pipe from the washer runs into the ground and to a dry well. No washer water runs on the ground, but into the dry well.
Also, you definitely need to be filtering the lint from your discharged wash water. Lint destroys drain fields and drywells by plugging them up.
Last edited by leejosepho; 11-18-2007 at 04:18 AM.
Thanks for your reply. It had not been raining. I have run washes before and after the episode. The washer is 2-3 feet above the dry well. It may have been a suction problem? In any event, I decided to put in a y vent in the 2" pipe above ground, out of doors, close to what you suggested to discharge any backup before it gets into the house. I will follow up on filtering the drain pipe. Live and learn.