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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. 

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.

It is generally safe to stay in a house with sewer gas for a short time, even though short-term exposure is unpleasant. However, prolonged inhalation can cause headaches, nausea, or respiratory irritation. High levels of methane—which is in sewer gas—can pose an explosion risk in enclosed spaces. Ventilate the area and call a pro if you smell sewer gas or experience related health symptoms.

A septic system can fail for various reasons, and most commonly, excessive water use or sudden surges in wastewater can overwhelm the system's capacity. Neglecting regular maintenance, like tank pumping and inspections, can also lead to clogs, leaks, and eventual breakdowns. Other issues that lead to failure include age-related wear and tear, root infiltration, improper disposal of non-biodegradable materials or chemicals into the system, unsuitable soil conditions, physical damage, and even environmental factors like flooding or soil erosion.