To effect economy of operation, any two or more districts may combine the use of administrative and operative personnel and equipment upon such basis of compensation therefor as is mutually agreed to by all such boards of commissioners participating. The methods to be used in the eradication, abatement, and control of mosquitoes and other arthropods shall be submitted to the division of health of the Louisiana Health and Human Resources Administration annually for approval by the state health officer or his successor, and the ordinances of any such board of commissioners hereinabove referred to shall not be legally effective without such approval.
La. R.S. § 33:7725