After permits have been issued, it shall then be the duty of the city, upon due notice, to tap the sewage collection pipe or inspect a tee or wye that was installed for the purpose of providing a connection point for a sewer service, as provided in this chapter. A permit holder may furnish and install tees and wyes for the purpose of providing a connection point for a sewer service in compliance with the city’s Standard Specifications. No person shall tap or make connections, either directly or indirectly, to any of the collection systems of the sewer works of the city, including private sewer collection systems, except through the city.