(a) There are hereby established 12 regional assessment districts, whose member municipalities shall fully and jointly reappraise their grand lists every six years pursuant to subsection 3417(b) of this subchapter. Member municipalities shall contract jointly with one or more third parties to conduct reappraisals.
(b) Each county shall constitute one regional assessment district, except that Franklin and Grand Isle Counties shall constitute one district and Essex and Orleans Counties shall constitute one district.