In this section, “basic main facility”: Includes: A sewage treatment plant; An intercepting sewer; An outfall sewer; A pumping station; and A force main that is connected with a sewage treatment plant, intercepting sewer, outfall sewer, or pumping station; and Does not include a lateral or collector pipe that serves individual properties or developments. The Secretary shall help counties and municipal corporations of this State and the Washington Suburban Sanitary Commission to develop comprehensive master plans for constructing the basic main facilities of sewerage systems for collecting and disposing of sewage or industrial waste from lateral or collector pipes. If the Secretary considers that regional planning is advisable, the Secretary shall attempt to coordinate on a regional basis: The development of master plans under subsection (b) of this section; and Approval of the construction of sanitary facilities under this subtitle. This section does not take away any power of the Washington Suburban Sanitary Commission.