; (ii) the violation occurred on a date before the community water system described in clause (i) entered into the partnership or after the community water system entered into the partnership but before the applicable deadline for compliance, as determined under paragraph (3)(C); and (iii) prior to entering into the partnership, a community water system or entity that did not receive a notice under subsection (b)(4)(A) discloses, in a form and manner prescribed by the Administrator, the violation to the head of the State agency with primary enforcement responsibility under section 1413, or the Administrator, if the State does not have such primary enforcement responsibility. (B) Failure to comply Subparagraph (A) shall not apply with respect to a partnership after the applicable deadline under paragraph (3)(C) if the partnership fails— (i) to correct any significant noncompliance that resulted in a notice under subsection (b)(4)(A); and (ii) to comply with this title by the applicable deadline. (6) Reciprocity The Administrator, in collaboration with the heads of State agencies with primary enforcement responsibility under section 1413, may provide incentives for States to provide greater flexibility in certification, licensing, or other requirements, to facilitate the provision of services to community water systems by professionals from other jurisdictions, with a focus on rural and disadvantaged communities. (7) Voluntary partnership decision The decision to undertake a partnership by a community water system receiving notice under subsection (b)(4)(A)— (A) is voluntary on the part of the community water system; and (B) shall not require any particular type of partnership agreement.