Implementation of regional plans.

All comprehensive regional plans, as well as subdivisions and platting regulations, shall be approved by the regional planning commission after public hearing and certified by the commission to all local governments and special districts within the region. Notice of the public hearing by the regional planning commission shall be published in a newspaper or newspapers of general circulation within the region, not more than fifteen nor less than ten days before the date set for the public hearing. Parties to the agreement shall be the constituent agencies for implementing the plan.