San Joaquin Reservoir Filtration Facility Project

2 Documents in Project


SCH Number
Lead Agency
Irvine Ranch Water District
Document Title
San Joaquin Reservoir Filtration Facility Project
Document Type
MND - Mitigated Negative Declaration
Project Applicant
Irvine Ranch Water District
Present Land Use
San Joaquin Reservoir

Document Description
IRWD is proposing to construct a new filtration facility that will improve the quality of the recycled water transmitted from the San Joaquin Reservoir (SJR) by reducing algae/detritus concentrations. The San Joaquin Reservoir Filtration Facility IS/MND was originally circulated for public review from June 3, 2020 through July 2, 2020. During the public review period, IRWD determined that a new pad would need to be constructed for the 1,500-kilovolt ampere (kVA) transformer, required by Southern California Edison (SCE) for electrical service. Construction of the new transformer pad would require notching of the adjacent hillside to install a retaining wall. The existing 300-kVA transformer would be removed, but the existing pad would remain after Project implementation. The new filtration facility would be constructed on an existing concrete pad that is north of the existing Flow Control Facility, which is on the north side of the SJR. The proposed filtration facility would be a single-level, above-grade structure that would total approximately 4,000 square feet. Two new filtration pumps would be installed within the filtration building to pump waste washwater from the filtration building to the southern end of the SJR for disposal. The pumps would connect with a proposed concrete at-grade equalization basin, which will be located outside the proposed filtration building. A pipeline would be installed from the equalization basin into the southern end of the SJR to return the filter waste washwater. The new filtration facility will also include an enlarged electrical room, along with a hose, sink/wash basin, emergency shower, and eye-wash station. In addition to the new filtration facility and associated pipeline, the proposed Project includes replacing the booster pumps, located in the existing pump room of the Flow Control Facility on the southern end of the concrete pad, to accommodate the new filters. The operation of the proposed Project would be conducted remotely, and there would not be any full-time dedicated staff at the SJR site.

Contact Information
Jo Ann Corey
Irvine Ranch Water District
15600 Sand Canyon Avenue
Irvine, CA 92618

Phone : (949) 453-5326


Newport Beach
Citywide Countywide Southern California
Cross Streets
Ford Road & Prairie Road
Total Acres
Parcel #
State Highways
Anderson Elementary
San Joaquin Reservoir

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (Filtration Facility)(Filtration Type)
Local Action
Other Action
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Greenhouse Gas Emissions Housing Job Generation Minerals Noise Population/Housing Balance Public Services Recreation/Parks Schools/Universities Septic System Sewer Capacity Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Tribal Cultural Resources Vegetation Water Quality Water Supply Wetland/Riparian Wildlife Growth Inducing Land Use Cumulative Effects
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, South Coast Region 5 California Department of Parks and Recreation California Department of Transportation, District 12 California Department of Water Resources California Governor's Office of Emergency Services California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Regional Water Quality Control Board, Santa Ana Region 8 Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Division of Drinking Water, District 8 State Water Resources Control Board, Division of Water Rights State Water Resources Control Board, Divison of Financial Assistance


Environmental Document
Recirculated ISMND PUBLIC DRAFT+NOI   PDF 13101 K Summary Form Recirculated 2020069004   PDF 832 K
NOC Recirculated 2020069004   PDF 450 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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