San Diego’s biggest water seller will sue the boundary referees that allowed two of its buyers to leave its business territory.

After hours of deliberation in a closed meeting last week, the board of the San Diego County Water Authority voted to sue the Local Agency Formation Commission, or LAFCO. That’s because LAFCO’s board agreed to let Rainbow Municipal Water District and the Fallbrook Public Utilities District divorce from the Water Authority last month so they could buy cheaper water from Riverside County.