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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 not normal to smell your septic outside and indicates a problem such as an unsealed manhole or access lid, a clogged septic line, a faulty vent stack, or the need for a septic tank pumping. If sewage is leaking from your septic system, it can be hazardous to you, your family, pets, and the surrounding environment. You can troubleshoot the issue yourself, or contact a septic tank pro who can resolve the issue quickly.

A septic smell may be harmful because sewer gas is dangerous depending on the exposure amount and length of time. Sewer gas is made up of multiple gases, including hydrogen sulfide, methane, ammonia, and carbon dioxide. Some of these gases, like hydrogen sulfide and ammonia, are toxic to humans and can be fatal in high concentrations or long exposures.