Sulfurous Taste & Odor
It is important to note that this odor is normally not a health concern, but one of aesthetic quality.
The most likely cause of a sulfurous or rotten-egg like odor is from either the water trap below the sink (i.e. the ‘P-trap’) or from within the faucet itself. As organic material settles in the water trap beneath the sink a sulfurous, or rotten egg smell is often mistakenly perceived as coming from the water.
The best way to test this theory is by filling a glass of water at the sink and then smelling it in a different room away from the sink. If the smell disappears, then the problem is most likely in the sink itself. Pouring a ¼ cup of bleach down the drain and allowing it to sit overnight should help relieve the problem. Cleaning the aerator is also recommended.