You are normally responsible for all drains that serve your property. This means keeping them clean and in good repair.Your responsibility does not stop at the boundary of your property. Drains that serve your property are usually your responsibility until they connect with a main sewer in the road. So too are sewers built after 1937.
Though you might not notice, these problems usually occur over a long period. Finally the drains are not able to adequetly flow and clog up very rapidly. In all of these cases it is necessary to replace all or part of the drains. The drains must be replaced to preserve the correct flow and the surrounding ground reinstated in such a way that the problem will not recur.