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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.

You should never pour antifreeze down the drain or outside on the ground. Because it's highly toxic, antifreeze can still impact people and animals long after it drains. Antifreeze can contaminate water and sewage systems, and any that gets into storm drains and water supplies can attract animals and harm those that ingest it.

Most households will need to pump their septic tank every three to five years. If you have a smaller tank or more people living in your home, you’ll likely be on the lower end of this spectrum (with less time between pumpings)—and vice versa if you have a bigger tank or live alone. On average, a professional septic tank pump costs $400.

You may be able to neutralize septic tank odors by flushing about 1 cup of baking soda down the toilet weekly, although the best option to banish odors is to have the septic tank pumped regularly, about once every three to five years. 

To minimize odors, only flush human waste and toilet paper in the toilet, and avoid pouring coffee grounds, fats, oils, or grease down the drains, as this could cause clogs. Rather than trying to neutralize a septic tank odor, you should hire a pro to determine the source of the smell, since sewage gas can be toxic.