For purposes of this section, the term “premise plumbing” means the water distribution system located within the property lines of a property, including all buildings and permanent structures on such property. Such term includes building supply and distribution pipes, fixtures, fittings, water heaters, water-treating and water-using equipment, and all respective joints, connections, devices, and appurtenances.
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42 U.S. Code § 18939 - Premise plumbing research
(a) In generalThe Secretary, acting through the Director, shall create a program, in consultation with the Environmental Protection Agency, for premise plumbing research, including to—
conduct metrology research on premise plumbing in relation to water safety, security, efficiency, sustainability, and resilience; and