A California state appeals court upheld a $17 million decision Friday awarding refunds to customers of the Coachella Valley Water District after a panel of judges ruled the government utility agency unconstitutionally charged non-agricultural customers more than agricultural ones. In its 55-page ruling, a panel of judges of California’s Fourth District Court of Appeal affirmed a lower court decision in favor of the Howard Jarvis Taxpayers Association, the nonprofit that brought the case. The court said that the difference in water rates violated state law because the rates are property taxes under the California constitution — taxes that were not approved by voters.