What’s Really Causing a Slow Bathroom Sink Drain?

A bathroom sink that drains slowly is one of the most common household plumbing complaints, and the cause is often less dramatic than people think. In most cases, the bottleneck is a buildup inside the drain line or in the trap area, where debris collects over time.

Plumbers typically see a few repeat offenders. The good news: with basic inspection and targeted cleaning, many slow drains can be restored without major repairs.