I have a gas odor in my basement, what is it?
Whether the odor is from natural gas or "sewer gas" you should immediately address the situation by calling the gas company or a plumber. If it is sewer gas the source of the problem is usually within the basement plumbing. There's definitely an odor associated with sewage but a properly installed plumbing system should not allow any of that gas into your house. Check to see if the water has evaporated out of a floor drain trap or any other unused drain such as an unused shower, allowing the gas to enter the house. Fill all those traps with a bucket of water to reseal the system. The problem may also be a blocked plumbing system vent stack located on the roof. Professional expertise may be required to correct that situation.

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1. What is chloride and where does it come from?
2. I have a gas odor in my basement, what is it?
3. I have a puddle of dirty water around my floor drain, what should I do?
4. Why is water splashing up or noise coming from my toilet?