All wells shall be maintained in a proper condition to conserve and protect groundwater resources and shall not be a source or cause of contamination or pollution of the water supply of any aquifer. All materials and construction practices used in the construction of a new well or new pump installation or in the maintenance, repair, or replacement of any well or pump installation shall conform with rules adopted by the board. All maintenance and repair work shall be done only by a licensed water well contractor, licensed pump installer, licensed plumber or licensed electrician.