The answer to 'sump pump foul smell' is that a foul odor from your sump pump is often caused by stagnant water, bacterial growth, or a clogged drainage system. This can lead to unpleasant smells in your basement or crawl space. The most common causes are a failure to properly maintain the sump pump, allowing water to sit and become stagnant, or a blockage in the drainage pipe that prevents the pump from fully removing water.
If you notice a foul smell, it's important to inspect the sump pump and surrounding area. Check for standing water, clean out any debris or buildup, and ensure the pump is working properly to remove water effectively. In some cases, you may need to disinfect the sump pit or replace the pump if it is old or malfunctioning. While many sump pump maintenance tasks can be done DIY, it's best to call a professional plumber if you're unsure of the cause or need more extensive repairs.