; (C) a decentralized wastewater treatment system for domestic sewage; (D) a groundwater storage and replenishment system; (E) a system for conservation of water or for transport and delivery of water for irrigation; or (F) a natural or engineered system that manages floodwaters. (b) Program The Administrator shall establish and implement a program, to be known as the Water Infrastructure Resiliency and Sustainability Program, under which the Administrator awards grants in each of fiscal years 2018 through 2022 to owners or operators of water systems for the purpose of increasing the resiliency or adaptability of the systems to any ongoing or forecasted changes (based on the best available research and data) to the hydrologic conditions of a region of the United States. (c) Use of funds As a condition on receipt of a grant under this section, an owner or operator of a water system shall agree to use the grant funds exclusively to assist in the planning, design, construction, implementation, operation, or maintenance of a program or project that meets the purpose described in subsection (b) by— (1) conserving water or enhancing water use efficiency, including through the use of water metering and electronic sensing and control systems to measure the effectiveness of a water efficiency program; (2) modifying or relocating existing water system infrastructure made or projected to be significantly impaired by changing hydrologic conditions; (3) preserving or improving water quality, including through measures to manage, reduce, treat, or reuse municipal stormwater, wastewater, or drinking water; (4) investigating, designing, or constructing groundwater remediation, recycled water, or desalination facilities or systems to serve existing communities; (5) enhancing water management by increasing watershed preservation and protection, including through the use of natural or engineered green infrastructure in the management, conveyance, or treatment of water, wastewater, or stormwater