The Metropolitan Water District of California has authorized the preliminary design to replace the wastewater system at Lake Mathews. A May 9 MWD board vote authorized the preliminary design process, appropriated $350,000 for that phase, and found the preliminary design phase to be categorically exempt from California Environmental Quality Act review. The preliminary design activity will include data collection, resource evaluation activities, and potential inspections. In the late 1930s MWD built the Colorado River Aqueduct which runs from Parker to Lake Mathews, and MWD’s Colorado River supply is distributed from Lake Mathews.