Why there is septic smell outside after heavy rain?
A smell from your septic tank after rain usually signifies a problem, either with your septic tank or with your general house plumbing. If your plumbing system is unable to get rid of dirty water, you’ll always have a foul smell hanging around after every rain.
When it rains, the air becomes heavy and doesn’t allow for proper release of methane gases through your vent. As a result, the gases remain on the ground because of the atmospheric pressure, which results in a foul smell. This happens because the air is less dense making it difficult for gases to rise. If there’s a loose toilet gas ring in your house, then the added pressure from the rain can push these gases through into the house, resulting in a bad smell.
If you’re noticing the smell coming from inside your house, it could be due to an issue with plumbing, the seals around your plumbing could be loose or broken which allows septic gases to escape into your home.