(A) Illicit discharges. Except as provided in subsection (B) of this section, a person shall not discharge an illicit discharge into an MS4, nor cause or allow an illicit discharge to be introduced or discharged into an MS4.
(B) Exceptions. The following discharges are exempt from the prohibitions set forth in subsection (A) of this section:
(1) Waterline flushing; landscape irrigation; diverted stream flows; rising ground waters; uncontaminated ground water infiltration to separate storm sewers; uncontaminated pumped ground water; discharges from potable water sources; foundation drains; air conditioning condensation; irrigation waters; springs; footing drains; lawn watering; individual residential car washing; flows from riparian habitats and wetlands; de-chlorinated swimming pool discharges (not including filter backwash); street wash water; and firefighting activities; or
(2) Discharges permitted under an NPDES stormwater discharge permit or a non-stormwater discharge permitted under an NPDES discharge permit.
In the event of any questions or complaints concerning the exceptions listed in subsection (B)(1) above, the Manager may take steps to determine if they are properly managed, and if not, may require mitigation measures necessary for proper management of these discharges.
(C) Illicit connections. A person shall not construct, use, maintain, or allow the continued existence of an illicit connection.
(D) Interference. A person shall not take or permit any action that interferes with, or is likely to interfere with, the proper operation of an MS4, including having or maintaining a prohibited material.
(E) Reporting to Maryland Department of the Environment (MDE). The county may report illicit connections and illicit discharges to MDE for enforcement and/or permitting in accordance with applicable law.