No plumber or other person shall turn on the supply of water to any building or premises prior to the installation of a meter on all service lines installed, or shall allow the same to be done, without a permit from the Director of Public Works. However, this section shall not be construed to prevent plumbers from turning on water to test the piping and fixtures and to provide water for construction purposes, in which case the plumber shall turn off the water as soon as these needs are met.