Seaport stormwater permitting and mitigation.

(1) A seaport listed in s. 403.021(9)(b) is authorized to provide for onsite or offsite stormwater treatment for water quality impacts caused by a proposed port activity that requires a permit and that causes or contributes to pollution from stormwater runoff. Offsite stormwater treatment may occur outside of the established boundaries of the port, but must be within the same drainage basin in which the port activity occurs. A port offsite stormwater treatment project must be constructed and maintained by the seaport or by the seaport in conjunction with an adjacent local government. In order to limit stormwater treatment from individual parcels within a port, a seaport may provide for a regional stormwater treatment facility that must be constructed and maintained by the seaport or by the seaport in conjunction with an adjacent local government.

(2) For a proposed port activity with water quality impacts that causes or contributes to pollution from stormwater runoff from a seaport not listed in s. 403.021(9)(b), and not including ports in Citrus County or Putnam County, a regional stormwater management system, as defined in s. 373.413(7)(a), operated by a nonlocal governmental entity independently or under contract with a seaport or local government, may not provide stormwater treatment or achieve net improvement under s. 373.414(1)(b)3. For a proposed port activity with water quality impacts that causes or contributes to pollution from stormwater runoff from a seaport not listed in s. 403.021(9)(b), and not including ports in Citrus County or Putnam County, a water quality enhancement area as defined in s. 373.4134 and operated by a nonlocal governmental entity independently or under contract with a seaport or local government may not convey enhancement credits to provide stormwater treatment or achieve net improvement under s. 373.414(1)(b)3.