A. 
Any drain or conveyance, whether on the surface or subsurface, that allows any nonstormwater discharge, including sewage, process wastewater, and wash water to enter a regulated small MS4 or to enter the surface waters of this commonwealth is prohibited.
B. 
No person shall allow, or cause to allow, discharges into a regulated small MS4, or discharges into waters of this commonwealth, which are not composed entirely of stormwater, except as provided in Subsection C below and discharges authorized under a state or federal permit.
C. 
The following discharges are authorized unless they are determined to be significant contributors to pollution of a regulated small MS4 or to the waters of this commonwealth:
(1) 
Discharges or flows from firefighting activities.
(2) 
Discharges from potable water sources, including water line flushing and fire hydrant flushing, if such discharges do not contain detectable concentrations of Total Residual Chlorine (TRC).
(3) 
Noncontaminated irrigation water, water from lawn maintenance, landscape drainage and flows from riparian habitats and wetlands.
(4) 
Diverted stream flows and springs.
(5) 
Noncontaminated pumped groundwater and water from foundation and footing drains and crawl space pumps.
(6) 
Noncontaminated HVAC condensation and water from geothermal systems.
(7) 
Residential (i.e., not commercial) vehicle wash water where cleaning agents are not utilized.
(8) 
Noncontaminated hydrostatic test water discharges, if such discharges do not contain detectable concentrations of TRC.
D. 
In the event that the municipality or DEP determines that any of the discharges identified in Subsection C significantly contribute pollutants to a regulated small MS4 or to the waters of this commonwealth, the municipality or DEP will notify the responsible person(s) to cease the discharge.
Roof drains and sump pumps shall discharge to infiltration or vegetative BMPs wherever feasible.
No person shall modify, remove, fill, landscape, or alter any SWM BMPs, facilities, areas, drainage easements, or structures that were installed as a requirement of this chapter without the written approval of the municipality.