North Basin Groundwater Remedial Investigation and Feasibility Study

The North Basin Groundwater Remedial Investigation and Feasibility Study focuses on a five-square-mile portion of the groundwater aquifer located under Fullerton, Anaheim and Placentia.

Manufacturing industries operating primarily in the 1950s, 60s and 70s left a legacy of industrial pollutants at their former factories. The pollutants, mostly volatile organic compounds (VOCs) including solvents and degreasers, have migrated through the soils and are now leaching into the underlying groundwater. These VOCs have impacted nearby water supply wells causing four of them to be taken out of service. 

OCWD has been conducting a remedial investigation and feasibility study (RI/FS) under EPA oversight. OCWD has completed the installation of 25 new monitoring wells at 13 locations as part of the RI/FS. These wells complement the extensive network of 80 existing monitoring wells OCWD previously installed to characterize groundwater contamination in the North Basin area. Monitoring wells were sampled in January and July 2019. The RI is scheduled to be completed in January 2020 and the FS is scheduled to be completed in Fall 2020.

OCWD and select potentially responsible parties are engaged with regulators and are working toward a long-term solution. The District will be looking to potentially responsible parties to fund clean up operations either through collaboration, litigation or by order of the EPA.

North basin plume map

Please click on the graphic below to view the plume map full screen.