; and (bb) ends on the date that is 180 days after the date on which the community water system submits the letter of intent described in item (aa). (ii) Exceptions During the time period described in clause (i)(II)— (I) the State or the Administrator, as applicable, may take or pursue an action against a community water system that receives a notice under subparagraph (A) to address an imminent and substantial public health risk; (II) any person may take or pursue an action against a community water system that receives a notice under subparagraph (A) with respect to any requirement relating to monitoring or public notification under this title; and (III) the Administrator may take or pursue an action under section 1431 against a community water system that receives a notice under subparagraph (A). ; (2) in subsection (d)— (A) by redesignating paragraphs (3) through (5) as paragraphs (7) through (9), respectively; (B) by inserting after paragraph (2) the following: (3) Partnerships (A) Definition of partnership In this paragraph and paragraphs (4) through (7), the term partnership means, as applicable— (i) a community water system resulting from a joint enterprise between, or the combined operations of— (I) one or more community water systems that receives a notice under subsection (b)(4)(A); and (II) one or more community water systems that has not received a notice under subsection (b)(4)(A); (ii) a community water system that, after receiving a notice under subsection (b)(4)(A), enters into a contractual agreement with another entity to oversee the financial, technical, or operational management of the system; (iii) a community water system resulting from a joint enterprise between, or the combined operations of, one or more community water systems that receives a notice under subsection (b)(4)(A)