First Aqueduct Treated Water Tunnels Rehabilitation

2 Documents in Project


SCH Number
Lead Agency
San Diego County Water Authority
Document Title
First Aqueduct Treated Water Tunnels Rehabilitation
Document Type
MND - Mitigated Negative Declaration
Present Land Use
General Plan: Rural Lands (RL-20) and Semi-Rural Residential (SR-4); Zoning: Agriculture (A70)
Document Description
The Water Authority has determined that rehabilitation of three existing treated water tunnels is required to prevent additional structure deterioration and ensure system reliability for continued delivery of drinking water to its member agencies. The project entails maintenance, improvement, and replacement of existing First Aqueduct infrastructure, including segments of three treated water tunnels and the bifurcation structures positioned at the upstream and downstream ends of each tunnel. The project would also develop new access manways along the tunnels to improve access into the tunnels for inspection and maintenance. No changes to the existing water supply or capacity would occur.

Contact Information

Sean Paver
Agency Name
San Diego County Water Authority
Contact Types
Lead/Public Agency


Escondido, Valley Center
San Diego
Cross Streets
Couser Canyon Road, Mystery Mountain Road, N. Broadway
see below
Total Acres
Other Information
Zip Codes: 92082, 92026

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, San Diego Region 9 (RWQCB), 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 Water Rights, California Department of Transportation, District 11 (DOT)
State Reviewing Agency Comments
California Department of Transportation, District 11 (DOT)
Development Types
Water Facilities (Existing facility rehabilitation (EFR))(Type EFR, MGD 0.000001)
Local Actions
Construction Contract
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Sewer Capacity, Solid Waste, Transportation, Vegetation, Wetland/Riparian, Soil Erosion; Forest Land/Fire Hazard; Water Supply/Groundwater


Notice of Completion [NOC] Transmittal form

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