The legal standard of legitimate government interest is a surprisingly high bar because it's very subjective and courts traditionally preume that all legislative acts are rational, placing the burden on the plaintiff to show that it's not. (law.stackexchange.com)
Most courts considering laws that state governmental agencies have claimed are necessary for fiscal responsibility, which Chelan County claims is the purpose of this rate increase, have concluded that the laws are rationally related to a legitimate government interest. (ethnews.com)
Rational basis review means that a court will uphold a law «if it is rationally related to a legitimate government interest.» (ethnews.com)