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You may notice a septic smell in your yard after it rains if groundwater is entering your septic tank and causing it to overflow. If you experience septic odors after rainfall, contact a licensed plumber. They can construct a drain to redirect rainwater away from your septic tank. 

Your sewer line can get grimy quickly. To prevent sludge buildup in your sewer line, pour a mixture of 1/3 cup of vinegar and 1/3 cup of baking soda down each drain in your home once a month. After about 30 minutes, flush the drain with hot water.

Some plumbers recommend 3/4 cup of bleach instead to clean any germs and bacteria that may build up in your sewer line. But this won’t break down any active clogs, and it cannot be combined with vinegar, as the mixture will create a toxic, hazardous gas.

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.

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.