(a) In this part the following words have the meanings indicated. (b) (1) "Industrial user" means: (i) A person who is engaged in manufacturing, fabricating, or assembling goods; or (ii) A member of any class of significant producers of pollutants identified under regulations adopted by: 1. The Secretary; or 2. The Administrator of the U.S. Environmental Protection Agency. (2) "Industrial user" does not include the federal, State, and local governments. (c) "PFAS chemicals" means a class of fluorinated organic chemicals that contain at least one fully fluorinated carbon atom, including perfluoroalkyl and polyfluoroalkyl substances. (d) "Pretreatment permit" means a document issued by the Department or the Department's designee that authorizes a significant industrial user to introduce industrial wastes into a publicly owned treatment works in compliance with the pretreatment requirements under COMAR 26.08.01.01B(69). (e) (1) "Significant industrial user" means an industrial user that: (i) Is subject to categorical pretreatment standards under 40 C.F.R. Part 403.6; (ii) Discharges an average of 25,000 gallons per day or more of processed wastewater to a publicly owned treatment works, not including sanitary, noncontact cooling, and boiler blowdown wastewater; (iii) Contributes processed wastewater that makes up 5% or more of the average dry-weather hydraulic or organic capacity of the publicly owned treatment works; or (iv) Is designated as a significant industrial user by the publicly owned treatment works on the basis that the industrial user has: 1. A reasonable potential for adversely affecting the wastewater treatment plant's operations and sewer system; or 2. Violated a pretreatment standard or requirement. (2) "Significant industrial user" does not include the federal, State, and local governments. (f) "Waters of the State" includes: (1) Both surface and underground waters within the boundaries of the State subject to its jurisdiction; (2) That portion of the Atlantic Ocean within the boundaries of the State; (3) The Chesapeake Bay and its tributaries; (4) All ponds, lakes, rivers, streams, public ditches, tax ditches, and public drainage systems within the State, other than those designed and used to collect, convey, or dispose of sanitary sewage; and (5) The floodplain of free-flowing waters determined by the Department on the basis of the 100-year flood frequency.
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