11 Miss. Code. R. 2-2.14
Concentrated animal feeding operations (CAFOs) are not excluded from the requirements for a permit or any other provisions of these regulations. CAFOs issued a National Pollutant Discharge Elimination System permit or a state water pollution control permit prior to January 18, 2000, are required to submit an application for a permit to construct and/or operate or a multimedia permit in compliance with the provisions of these regulations at least 180 days prior to the expiration of the facility's NPDES permit or state water pollution control permit that was issued prior to the effective date of these regulations. Multimedia permits may be issued by the Permit Board as new permits or as a modification of an existing National Pollutant Discharge Elimination System or state water pollution control permit but all provisions and procedures of these regulations are applicable. The Permit Board on its own initiative or at the request of DEQ, may require any existing or new animal feeding operation or concentrated animal feeding operation to obtain a multimedia permit, including provisions regarding air emissions and/or odor control.
11 Miss. Code. R. 2-2.14