The authority shall have the power:
Such plan shall not be adopted until a public hearing on such plan shall have been held, upon not less than fourteen days' notice thereof to each customer, either by mail or by publication once in a newspaper having general circulation within the district; every five years, such plan shall be reviewed and revised if necessary after a public hearing, with notice to each customer as aforesaid;
N.Y. Pub. Auth. Law § 1199-EE