Maryland Code, Environment § 9-332

(a) A person may not introduce any pollutant, either directly or indirectly, into a publicly owned treatment works, or into any conveyance leading to a publicly owned treatment works, in violation of any applicable pretreatment requirements including federal pretreatment standards, State requirements, local ordinances, or any pretreatment agreement.

(b) The Secretary may delegate to owners of publicly owned treatment works the authority to apply and enforce State pretreatment requirements against industrial users.

(c) The Secretary may determine which publicly owned treatment works are or may be adversely impacted by industrial users and may require the owners of those publicly owned treatment works to develop and maintain programs which meet State pretreatment requirements.

(d) This section shall not be construed to limit any other provision of law imposing any restriction or prohibition relating to the discharge or disposal of pollutants or controlled hazardous wastes.