Yes, a residential washing machine drains wastewater directly into your home's main sanitary sewer or septic system plumbing lines. The flexible external drain hose hooks into an upright vertical standpipe or empties into a laundry tub, which is connected to building drain pipes protected by a curved P-trap. This P-trap retains a small amount of water to block sewer gases from venting backward into your laundry room. You can troubleshoot drainage plumbing easily by checking the standpipe height. You can verify that your drainage system is functioning correctly when wastewater empties rapidly down the standpipe during a drain cycle without backing up onto the floor or emitting foul odors.
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