; and (2) in subparagraph (C), by inserting maximum before 30-day period . IV Protecting consumers and individuals through improved mitigation 401. Provision of Community Rating System premium credits to maximum number of communities practicable Subsection (b) of section 1315 of the National Flood Insurance Act of 1968 ( 42 U.S.C. 4022(b) ) is amended— (1) in paragraph (2), by striking may and inserting shall