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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.

When septic systems begin to fail, your waste will start to seep into the groundwater. You may notice a foul odor (it’ll smell like sewage) or a squishy, moist lawn. The grass right over your tank or drain field might grow super lush and green because your waste actually fertilizes it. Other signs include standing water in your drain field, slow-draining sinks and tubs, and gurgling noises in the plumbing.

The best thing to unclog a septic tank is a mechanical auger, especially if the clog is far down the line or particularly dense. You can also clear a clog in a septic line with a wooden pole or steel rod. Be sure to follow safety precautions when working in a septic tank, including wearing heavy-duty work gloves, goggles, and a gas mask.

A few signs can indicate that your cesspool needs to be emptied outside of its typical schedule. An unpleasant odor coming from your pipes or near the cesspool, gurgling noises in your pipes, and uncharacteristically good growth in your yard are signs of cesspool problems that suggest build-up or overflow. If your pipes back up, you should have your cesspool looked at right away.