Direct Answer: This smell is usually caused by bacteria buildup in the "P-trap" or a dried-out floor drain that is allowing sewer gases to enter your home.

If it’s a guest bathroom you rarely use, try running the water for a minute to refill the trap. If the smell persists in a frequently used sink, you likely have a clog of hair and organic matter that needs a professional cleaning. Avoid harsh chemical cleaners, as they can eat away at older pipes in Midlands homes!