No gas company, electrical company, wastewater company, water company, or thermal energy company may make or grant any undue or unreasonable preference or advantage to any person, corporation, or locality, or to any particular description of service in any respect whatsoever, or subject any particular person, corporation or locality or any particular description of service to any undue or unreasonable prejudice or disadvantage in any respect whatsoever.
RCW 80.28.090
Unreasonable preference prohibited.
Applied in 8 court decisions — leading case Okeson v. City of Seattle (2003)
Most recently applied in Willman v. Washington Utilities & Transportation Commission (August 2005)
2025 c 263 s 15; 2011 c 214 s 18; 1961 c 14 s 80.28.090
How often courts cite this section
Court decisions citing this, by year. The dip in the last several years is a data-coverage gap, not a real trend — our corpus holds fewer opinions from the most recent years, so recent citations are undercounted.
Official source: Washington State Legislature. Reproduced from public-domain Washington statutes; confirm against the official source for the current text. Not legal advice.