Water Filtration, Well Drilling, and Pump Installer License Pump installer is a person who is employed in the placement and preparation for operation of pumps and pumping equipment and materials utilized in withdrawing or obtaining water for water-supply distribution lines. Residential water-filtration/treatment-system contractor engages of the placement and preparation for operation and service of residential water-filtration and water-treatment systems, equipment, devices, materials, and safeguards as may be necessary to protect such water from contamination and all construction Residential water-filtration/treatment-system installer is a person who engages in the placement and preparation for operation of residential water-filtration and water-treatment systems, equipment, devices, materials, and safeguards as may be necessary to protect such water from contamination and all construction. Well-drilling contractor is a person who engages in well drilling, including the installation, alteration, removal, or repair of water-supply systems. R.I. Gen. Laws § 5-65.2-2