Louisiana Revised Statutes Tit. 30, § 2379. Preemption

A. No local governing authority, municipality, parish, or other local governmental entity may enact, adopt, or enforce an ordinance, law, or regulation relative to hazardous materials reporting or any other provisions of this Chapter, except as otherwise specifically authorized by state law. However, if reporting requirements to agencies in the federal government under federal law conflict with reporting requirements under this Chapter, the affected entities shall file those reports. This Chapter shall have prospective effect only.

B. The commission and the department shall, where practical and feasible, incorporate local purposes into the state information system and provide local access to such information, subject to the qualifications provided for in R.S. 30:2368(B)(1).