The inspection program will check for obvious signs of cross connections, but it is not proposed to go into in-depth inspections for these types of connections. These connections used to be a standard practice in house construction, but are no longer permitted. Many older homes are hooked up to old tile lines that may have collapsed or been disconnected.
There is not a clear cost-benefit to the City in identifying and/or correcting these illegal connections, however people who have had problems with back-ups from these types of connections should strongly consider correcting the problem. The City does periodic televising of sewer lines, and may do smoke and dye testing to identify some of these problem systems that affect the municipal sewer system in the future.