City of Angels Water Treatment Plant Upgrade


SCH Number
Lead Agency
City of Angels Camp
Document Title
City of Angels Water Treatment Plant Upgrade
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Water Treatment Plant/Unclassified, Resource Production, Highway Service/Resource Production - Rural Residential

Document Description
Water treatment plant and transmission facilities improvements over a two-phase, approximately five-year period including, but not limited to: the addition of a second flocculation basin, repurposing the existing sediment basin, replacing three existing filters with two, demolishing and filling the existing clear well to accommodate a new reclaim tank and reclaim water processing equipment, installing a new water transmission line, culverting the open ditch channel providing Union Ditch water from the Angels Forebay to the property boundary and associated activities. Phase 2 includes expanding the plant’s capacity to meet the projected maximum daily demand flow for the year 2031 and includes demolishing and re-designing the sedimentation basin area to accommodate an additional flocculation basin and two new plate settler structures. Two new filter vessels will replace the existing three vessels to increase production, reduce backwash water by more than 50 percent, and allow the plant to remain online during backwashing. Additional sludge dewatering equipment and drying beds will be added to process the increased sludge volume and associated activities. A complete project description is available at City Hall.

Contact Information
Amy Augustine
City of Angels
Lead/Public Agency
P.O. Box 3117
Sonora, CA 95370

Phone : (209) 532-7376

City of Angels
Project Applicant


38°5'41.7"N 120°32'13.6"W
Angels Camp
Northern California
Cross Streets
Murphys Grade Road
Total Acres
Parcel #
057-011-02, -03, -15, -04, -05, 57-019-01, -03
State Highways
Bret Harte Union High School
Unnamed tributary, Union Ditch
22, 27

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (Type Treatment Plant, MGD 2 (1440 gpm))
Local Action
Project Issues
Aesthetics Air Quality Biological Resources Cultural Resources Cumulative Effects Drainage/Absorption Flood Plain/Flooding Geology/Soils Greenhouse Gas Emissions Hazards & Hazardous Materials Hydrology/Water Quality Land Use/Planning Mineral Resources Noise Recreation Septic System Solid Waste Transportation Tribal Cultural Resources Vegetation Wetland/Riparian Wildfire Wildlife
Reviewing Agencies
California Air Resources Board (ARB) California Department of Conservation (DOC) California Department of Fish and Wildlife, North Central Region 2 (CDFW) California Department of Forestry and Fire Protection (CAL FIRE) California Department of Parks and Recreation California Department of Water Resources (DWR) California Highway Patrol (CHP) California Native American Heritage Commission (NAHC) California Natural Resources Agency Central Valley Flood Protection Board Department of Toxic Substances Control Office of Historic Preservation State Water Resources Control Board State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Division of Drinking Water, District 5 State Water Resources Control Board, Division of Water Rights State Water Resources Control Board, Divison of Financial Assistance California Department of Transportation, District 10 (DOT) California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)


Environmental Document
Angels Water Treatment Plant MMRP   PDF 756 K Draft IS MND Angels Water Treatment Plant2   PDF 8085 K NOI_20200120 Angels Water Treatment Plant   PDF 102 K Summary Form Anels Water Treatment Plant   PDF 581 K
NOC Angels Water Treatment Plant   PDF 241 K
State Comments
2020110289_DOT Comment   PDF 203 K 2020110289_RWQCB Comment   PDF 298 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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