Water in sewer line to the street connection
I have been having problems with clogged drains lately. All fixtures backed up except the kitchen sink, which is the closest fixture to exiting the house. I located the clean out on the outside of the house that leads to the service connection at the street. I notice there is about two inches of water in the 4" pipe. My question is: Should there be water standing in this line at all times, even when no fixture is being used? Could I have a clog closer to the street service connection? Thanks for any help. Edit: The original backup was resolved using chemicals and now everything flushes and drains. When flushing the toilet and viewing the flow at the cleanout to the street, I can see the flow volume increase but the soilds move very slowly through the pipe. About two inches of water remain in the pipe after the flush.