Home built in 1967. Accepted standard was to hook foundatiion tile to sanitary sewer line. The city inspector had to approve before we moved into the home and he did. Now the city is requiring all homeowners to allow screening, water pumped into yard near the sewer line leaving the house site and watching for colored water flowing into the sewer. If colored water is seen the home owner must fix the problem. Is this not an expostfacto issue?