The Diablo Water District is considering using treated wastewater from the Ironhouse Sanitation District to replenish local groundwater supplies, according to officials from both agencies. If implemented, both agencies said they hope that replenished groundwater aquifers would strengthen East County’s resilience to water supply changes and meet water reuse goals directed by the state government. Reports from the California Department of Water Resources advise that such an operation can produce safe drinking water provided that significant water quality tests are done before distributing the treated water. The Diablo Water District provides water for residents, parks, and businesses in a 21-square-mile area consisting of Oakley, Cypress Corridor, Hotchkiss Tract, Summer Lakes, and portions of Bethel Island and Knightsen. The Ironhouse Sanitation District provides wastewater treatment for Oakley and Bethel Island.