Thanks for the info. I think we may have sulfur. I sometimes smell rotten egg smell in the bathroom when I turn on the sink faucet and almost always smell it when I do laundry, which is very near to the bathroom. I've heard rotten egg smell is sulfur. Do you know if there is a way to test the water for this? And how to get rid of it? Thanks so much for responding! I am gonna look into a water softner and filter.