1. Short title This Act may be cited as the Water Infrastructure Resiliency and Sustainability Act of 2018 . 2. Water infrastructure resiliency and sustainability (a) Definitions In this section: (1) Administrator The term Administrator means the Administrator of the Environmental Protection Agency. (2) Hydrologic conditions The term hydrologic conditions means the quality, quantity, or reliability of the water resources of a region of the United States. (3) Owner or operator of a water system (A) In general The term owner or operator of a water system means an entity (including a regional, State, interstate, Tribal, local, municipal, intermunicipal, or private entity) that owns or operates a water system. (B) Inclusion The term owner or operator of a water system includes— (i) a non-Federal entity that has operational responsibilities for a federally, tribally, or State-owned water system; and (ii) an entity established by an agreement between— (I) an entity that owns or operates a water system; and (II) at least one other entity. (4) Water system The term water system means— (A) a community water system (as defined in section 1401 of the Safe Drinking Water Act ( 42 U.S.C. 300f )); (B) a treatment works (as defined in section 212 of the Federal Water Pollution Control Act ( 33 U.S.C. 1292 )), including a municipal separate storm sewer system (as such term is used in the Federal Water Pollution Control Act ( 33 U.S.C. 1251 et seq.)); (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