“Commercial water-filtration/treatment-system work,” as used in this chapter, means any alteration, installation or repair of water-filtration/treatment systems in which the piping exceeds one and one-half inches (1.5") or the flow rate exceeds eighty (80) gallons per minute.
“Commercial water-filtration/treatment-system work” defined
R.I. Gen. Laws § 5-20-5.2., under Chapter 5-20 Plumbers, Irrigators, and Water System Installers.
R.I. Gen. Laws § 5-20-5.2.