(1) The statutory notice periods for tariff changes are:

(a) The commission must receive tariff changes not less than thirty days in advance of the requested effective date as required by RCW 80.28.060 and 80.36.110 (1)(a);

(b) The commission must receive telecommunications tariff changes that reduce rates with no offsetting rate increases not less than ten days in advance of the requested effective date, as required by RCW 80.36.110 (2)(a). If a company makes a filing pursuant to this subsection, it may not file for an increase to any rate, charge, rental, or toll to recover the revenue deficit that results from the decrease for a period of one year.

(2) The statutory notice period begins on the date the commission receives the tariff filing, in accordance with WAC 480-80-031.