Question

Why does drain water have foul smell?

Answer 1

"The smell of sewage is likely caused by bacteria in your drain production gases that arise when the faucet is turned on. Hydrogen sulfide is the gas most likely to cause this smell. "

Answer 2

Turning on the faucet may result in a foul smell coming from water itself....a drain that has a sewer like smell coming from , it may suffering from a dried out. ..it generally cause by bacteria ...or hydrogen sulphide is responsible for this type of smell. .

Hope it helpful