Influences and authorities relating to Local Laws are:
The Act enables Western Australian local governments to make local laws considered necessary for the good government of their districts. Local Laws cannot be contrary to any State or Federal Law. They can only be made when sanctioned by the Act or other written laws. Local Laws can cover many different areas such as cats & dogs, public places, cemeteries, etc.
Further information is available on Local Laws on the Department of Local Government & Communities website at:
https://www.dlgc.wa.gov.au/LegislationCompliance/Pages/Local-Laws.aspx#sthash.O17kb7G6.dpuf