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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.

Baking soda can help neutralize septic tank odors. If the pH balance in your tank is off, it may emit a sulfurous, rotten-egg-like smell. Flushing about one cup of baking soda down the toilet once a week can help neutralize the odor. To increase the beneficial bacteria in your tank, you can add three rotten tomatoes through your garbage disposal every three months.

To prevent odors in the first place, only flush human waste and toilet paper. Avoid pouring coffee grounds, fats, oils, or grease down your drains, as this can lead to clogs. While these methods can help, the most effective long-term solution is to have your septic tank pumped regularly, typically every three to five years. Because sewage gas can be toxic, it is recommended to hire a professional to identify the source of the smell rather than only trying to neutralize it.

There are a few things that can make your drain field fail. These include driving or parking vehicles or heavy machinery on the field, excess sodium in the soil, or having a high water table. You can prevent failure by ensuring your installer checks that your chosen location is suitable for a drain field and properly maintaining your system with the help of a professional.

Common signs that a septic tank is full include plumbing issues, odors, and changes in your yard. You may notice wastewater or sewage backing up into your home's drains, or that sinks, tubs, and toilets are draining slowly. Gurgling or bubbling sounds from the pipes are also a key indicator. Outside, you might smell foul sewage odors around your house or the septic tank area. Look for pooling water, spongy soil, or a marshy environment around the drain field. Another tell-tale sign is a patch of grass over the septic system that is suddenly lusher and greener than the rest of your lawn. If you notice any of these signs, you should contact a septic professional for an inspection and pumping.