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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.

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.

It is generally safe to stay in a house that smells like sewage for a short time, but you should get the problem fixed as soon as possible. While the level of sewer gas is usually low enough to only cause minor symptoms, prolonged inhalation can lead to headaches, nausea, or respiratory irritation. High levels of gas exposure can be more dangerous, and high concentrations of methane—a component of sewer gas—can pose an explosion risk in enclosed spaces. If you smell sewer gas in your home, ventilate the area and call a professional to locate, assess, and fix the problem, as it will not go away on its own.

No. You should never empty a septic tank yourself because it involves working with specialized equipment (that you probably don’t have) and puts you at risk of breathing in toxic fumes. Plus, once you’ve removed the waste, you’ll need to transport it and dispose of it safely. Instead, call an expert for this job. On average, hiring a pro to pump a septic tank costs $550.