For several days to a few weeks at a time our city supplied tap water will all of a sudden have the taste and smell of rotten vegetation. The condition of the water is at times so extreme that filtration systems will not remove the taste and smell. We have complained to the Water Dept. They have pointed to algae blooms as the cause, however we doubt the validity of this, as this problem has returned even now in November. We have started to doubt that our tap water is actually potable and may be contaminated in some way.