South Basin Groundwater Remedial Investigation and Feasibility Study

The South Basin Groundwater Remedial Investigation and Feasibility Study focuses on a two-square-mile portion of the groundwater aquifer located under Irvine, Santa Ana and Tustin.

The South Basin is contaminated near the surface with volatile organic compounds (VOCs) left behind from decades old manufacturing. In this area, the geology is different and the migration rates of the pollutants are a little slower than in the North BasinOne water supply well has been removed from service because contaminants reached elevated levels. OCWD is embarking on a comprehensive plan to control the spread and eventually remove these chemicals that have migrated beyond their original pollution sources and now threaten the deeper aquifers from where drinking water is drawn. Regulatory oversight is provided by the Department of Toxic Substance Control (DTSC) and the Regional Water Quality Control Board (RWQCB). These two state agencies are working closely with OCWD and some cooperative potentially responsible parties to map the occurrence of the contaminants, identify appropriate remedies and implement groundwater cleanup. 

Updates

Agenda items

For all items pertaining to the project, please search our meetings and agendas page.

Additional information