La. Stat. tit. 33 § 4780.49
Whenever the regulations made under authority of this Subpart impose higher standards than are required in any other statute or local ordinance or regulation, the provisions of the regulations made under authority of this Subpart shall govern. Whenever the provisions of any other statute, local ordinance, or regulation impose higher standards than are required by the regulations made under authority of this Subpart, the provisions of such statute, local ordinance, or regulation shall govern. However, no local governing authority shall restrict, conflict with, interfere with, or supersede the powers of the state through its agencies to regulate, permit, or enforce environmental laws and regulations nor shall they restrict, conflict with, interfere with, or supersede activities operating in accordance with authorized state or federal permits, laws, or regulations. Nothing in this Subpart shall supersede the provisions of R.S. 3:3607.
La. R.S. § 33:4780.49