Irvine Ranch Water District San Diego Creek Watershed Natural Treatment System (NTS)

10 Documents in Project


SCH Number
Lead Agency
Irvine Ranch Water District
Document Title
Irvine Ranch Water District San Diego Creek Watershed Natural Treatment System (NTS)
Document Type
EIR - Draft EIR
Present Land Use
Varies depending on location of 31 proposed NTS Plan Facilities

Document Description
The NTS plan is a watershed-wide system for the natural treatment of storm runoff and dry weather flows generated within the 122 square mile San Diego Creek Watershed and approximately 1.3 square miles of the Santiago Creek Watershed. The Santiago Creek Watershed is a tributary of the Santa Ana River. The NTS plan consists of a system of 31 constructed water quality treatment wetlands. These facilities use wetlands vegetation and take advantage of naturally occuring physical, chemical, and biological processes to treat the runoff and dry weather flows. The natural and man-made drainage features within the San Diego Creek Watershed all drain via San Diego Creek and its tributaries into Upper Newport Bay. These flows then enter Lower Newport Bay on their way to the Pacific Ocean.

Contact Information
Norris Brandt
Irvine Ranch Water District
Lead/Public Agency
P.O. Box 57000
Irvine, CA 92619

Phone : (949) 453-5590


Irvine Irvine, Tustin, Lake Forest, Laguna Hills, Laguna Woods, ... Laguna Hills Laguna Woods Lake Forest Newport Beach Orange Santa Ana Tustin
State Highways
John Wayne

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Natural Treatment System Constructed Wetlands)
Local Action
Master Plan
Project Issues
Aesthetics Agriculture and Forestry Resources Air Quality Cultural Resources Cumulative Effects Drainage/Absorption Flood Plain/Flooding Geology/Soils Growth Inducement Hydrology/Water Quality Land Use/Planning Noise Public Services Recreation Vegetation Wetland/Riparian Wildlife
Reviewing Agencies
California Coastal Commission (CCC) California Department of Conservation (DOC) California Department of Fish and Wildlife, South Coast Region 5 (CDFW) California Department of Health Care Services (DHCS) California Department of Parks and Recreation California Department of Transportation, District 12 (DOT) California Native American Heritage Commission (NAHC) California State Lands Commission (SLC) Department of Fish and Wildlife, Marine Region Department of Water Resources Resources Agency State Water Resources Control Board, Division of Water Quality State Water Resources Control Board, Division of Water Rights California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB)

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

Download CSV New Search Print