The county of LOS angeles will construct four new injection wells and two monitoring wells to modernize the dominguez GAP barrier project, which protects the west coast basin aquifers from seawater…

The Department of the Interior Bureau of Reclamation awarded $6 million to the County of Los Angeles Department of Public Works on December 23, 2025, under the Reclamation States Emergency Drought Relief program (CFDA 15.514) to modernize the Dominguez Gap Barrier Project.

The County will construct four new injection wells and two monitoring wells to strengthen the freshwater pressure ridge that blocks seawater intrusion into the West Coast Basin aquifers, which supply drinking water to over four million residents. The project will decommission three aging injection wells to prevent groundwater cross-contamination and will recharge up to 579 acre-feet of water annually by integrating advanced treated recycled water injection. Work is performed in Alhambra, California, with completion targeted for September 30, 2028. The assistance type is a project grant. This award supports infrastructure improvements for increased water supply and drought resilience as part of Reclamation's cooperative effort with states and other entities to implement actions that increase water supply and hydropower reliability.

The county of LOS angeles will construct four new injection wells and two monitoring wells to modernize the dominguez GAP barrier project, which protects the west coast basin aquifers from seawater intrusion. These aquifers supply drinking water to over four million residents and support regional water supply reliability. The county will decommission three aging injection wells to prevent groundwater cross-contamination. The new injection wells will strengthen the barrier by forming a freshwater pressure ridge to block seawater inflow and will recharge up to 579 acre-feet of water annually. This project promotes sustainable water management by integrating the injection of advanced treated recycled water, ensuring the long-term reliability of water supplies for the region.