(a) The commission shall grant to any county, city, or town that is authorized under Subchapter A, Chapter 571, Local Government Code, to build and maintain seawalls a permit for the taking of marl, sand, gravel, shell, or mudshell to be used for the building, extending, protecting, maintaining, or improving any seawall, breakwater, levee, dike, floodway, or drainway.
(b) Permits under this section shall be issued under regulations established by the commission.

(c) A county, city, or town taking marl, sand, gravel, shell, or mudshell under this section is not required to purchase the marl, sand, gravel, shell, or mudshell.