Section 9-329.1 - Chlorine systems - Publicly or privately owned sewage treatment plants(a) This section does not apply to: (1) A publicly or privately owned sewage treatment plant; or(2) The discharge of any chlorine or chlorine products that are present due to their occurrence as a natural constituent of saline water.(b) A person who has a discharge permit may not discharge chlorine or chlorine products into the Chesapeake Bay or its tributaries during April and May of any year at a level that is greater than the chlorine discharge level that is applicable to a publicly or privately owned sewage treatment plant under § 9-329 of this subtitle.