Forget it! You are worrying about absolutely nothing at all. Normal wear and tear, especially in urban areas where the supply lines tend to be old.
maybe. but 21 in the last 5 1/2 days... seems like a bit much.
as someone posted, pipe will last from 75-130 years. if this were common, then i should be able to find a similar volume during any given month last summer (i found an increase since january, but i only posted events from the last month)