Over the past several months, I have noticed a strong smell coming from all the taps in my house when the water is initially turned on-hot or cold. The first time I noticed was after rinsing my hands off-I could smell mildew on my hands! This house was built in the mid 1980s and we have been here over 3 years. Bathtub taps do not seem to have the same problem. Can this be fixed and is it harmful?