No, standing water is generally not normal inside a standard residential sink drain, wastewater pipe, or appliance drum, though a small amount of standing water is intentionally maintained inside the curved bottom loop of a P-trap plumbing fixture. The water trapped inside a P-trap acts as a vital physical gas barrier that blocks noxious sewer gases and foul odors from rising up into your home. However, standing water pooled inside a washing machine drum, sink basin, or shower floor indicates a plumbing clog, a blocked pump filter, or a slow drainage pipe. You can troubleshoot drainage easily. You can verify proper drainage when wastewater flows cleanly down the pipe without pooling or backing up.
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