The following connections are prohibited, except as provided in §
308-43C above:
A. Any drain or conveyance, whether on the surface or subsurface, that
allows any nonstormwater discharge, including sewage, process wastewater,
wash water entering the separate storm sewer system, and any connections
to the storm drain system from indoor drains and sinks. Any drain
or conveyance that delivers nonstormwater discharges directly into
wetlands, riparian buffers, or other waters of the commonwealth is
prohibited.