Why does my water have a septic-like smell?
Water with very low levels of dissolved oxygen will develop a septic/rotten egg odour, but this should not happen in your drinking water. The most common cause of this type of problem is the drain.
Over time, organic matter such as hair, soap and food waste can accumulate on the walls of the drain. Bacteria can then grow on that organic matter. What you can smell is the gas produced by the bacteria.
You will be more likely to smell the rotten egg odour when water from the shower or kitchen tap runs over the drain.
You can alleviate this smell by rinsing your drain with a strong disinfectant bleach.
