To get rid of a sewer smell in your crawl space, you’ll have to find the source of the problem. If it has to do with your sewer lines, then repairing the line will help. You may need to make other repairs, like fixing your sump pump or encapsulating your crawl space to reduce moisture. After you make the repair, depending on the issue, you may still need to clean out your crawl space to get rid of the stink.

Your home has a few telltale signs of a sewer line problem. If you notice multiple plumbing fixtures (toilet, sink, or shower drains) appear to be clogged, call a plumber ASAP. Also, if water appears in the tub or shower when you flush the toilet, you likely have a sewer line issue. A sulfur (rotten eggs) smell and bubbling or gurgling noises at the drain also warrant a check. And keep your eyes peeled for changes to the yard, such as a new indentation or mysteriously soggy grass.

If the toilet is overflowing but there’s no clog, that’s a sign that the issue is deeper in the system, and plunging may not help. A blockage in your home’s plumbing, the plumbing vent, or even city sewer lines can cause toilets to overflow. The issue could also be the toilet itself if the filler float isn’t set to the correct height or if parts are damaged or worn out.

Regardless of the drain cleaner type you choose to use, they all work through chemical reactions that create heat. Thanks to the heat, the clogged hair begins to dissolve until it is able to be flushed away. To avoid clogs in your drain due to hair, use hair catchers and empty them out after every shower.