To provide solid waste collection companies with sufficient time to prepare and submit tariffs and rate filings for public comment and commission approval, the owner or operator of a transfer station, landfill, or facility used to burn solid waste shall provide seventy-five days' notice to solid waste collection companies of any change in tipping fees and disposal rate schedules. The notice period shall begin on the date individual notice to a collection company is delivered to the company or is postmarked.

A collection company may agree to a shorter notice period: PROVIDED, That such agreement by a company shall not affect the notice requirements for rate filings under RCW 81.28.050.

The owner of a transfer station, landfill or facility used to burn solid waste may agree to provide companies with a longer notice period.

"Solid waste collection companies" as used in this section means the companies regulated by the commission pursuant to chapter 81.77 RCW.