Summary: Petition for de-regulation of Monterra, Inc. (Monterra). In February of 2019 the company sold its assets to Cascadia Water, LLC in a joint sale and transfer application (UW-190116). Monterra (Department of Health ID # 55990Y) is now seeking to be removed from regulation and cancel their former tariff WN U-3. Cascadia Water, LLC, filed tariff updates to the company's service area and rate page reflecting the addition of Monterra water system serving 185 customers near Sequim in Clallam County.