I have a question that I know nothing about....I live in a development and out by the road I have two vent pipes on the opposite sides of my lot....the one is clear and dry and the other is filled with water...It looks like these are pipes that drain water from the house into the sewer system.....why might the one be filled with water....someone brought this to my attention and didn't know what was wrong but knew that it shouldn't be filled with water....When we had our pool put in a year and half ago the equipment ran over the top of this vent and a bunch if rocks and mud got down in there....is it possible the drain got clogged that dumps into the sewer and as a result is flowing up over the top....Who would I call?