Customer Notice

For the latest information, resources, and guidance related to COVID-19, please visit our COVID-19 information page or visit our COVID-19 Utility Bill Assistance page.


The UTC regulates private water companies operating within Washington state that have 100 or more connections or if the utility charges more than $557 a year per customer.

About the Companies

Information for Companies

Affiliated Interest Rule


General Rate Case Workbook – Comprehensive Template

Standalone Template

Electronic Filing

Information for Consumers