Use of Copper to Control Algae and Aquatic Animal Invasive Species in Lake Casitas


SCH Number
Lead Agency
Casitas Municipal Water District
Document Title
Use of Copper to Control Algae and Aquatic Animal Invasive Species in Lake Casitas
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Drinking Water Reservoir, Recreation Area, Open Space
Document Description
Casitas Municipal Water District proposes to apply copper-containing algaecides and/or molluscicides in compliance with Water Quality Order 2013-0002-DWQ (CAG990005) Statewide General NPDES Permit for Residual Aquatic Pesticide Discharges to Waters of the U.S. from Algae and Aquatic Weed Control Applications & Water Quality Order 2016-XXXX-DWQ (CAG990006) Statewide General NPDES Permit for Biological Pesticides and Residual Chemical Pesticide Discharges to Waters of the U.S. from Aquatic Animal Invasive Species Control Applications to control algae and invasive mussels that threaten to degrade Lake Casitas' existing and potential beneficial uses. Nuisance algae growth can degrade aesthetic and recreational functions of the lake and present operational challenges to reservoir and water treatment facility managers. In addition, cyanobacteria (blue-green algae) blooms can produce cyanotoxins which impart undesirable taste and odors to lake water and drinking water and can be harmful to humans, domesticated animals, and wildlife. Dreissenid mussels have been identified in nearby waterbodies and pose an immediate threat due to their ability to colonize in and block water delivery infrastructure and strip food from the water that is necessary to sustain other aquatic life.

Contact Information

Stephen Burkholder
Agency Name
Blankinship & Associates, Inc.
Job Title
Senior Biologist
Contact Types
Consulting Firm

Jordan Switzer
Agency Name
Casitas Municipal Water District
Job Title
Water Quality Supervisor
Contact Types
Lead/Public Agency


Casitas Springs, Oak View
Other Location Info
Lake Casitas

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Department of Pesticide Regulation (DPR), California Department of State Parks, Division of Boating and Waterways, California Department of Transportation, District 7 (DOT), 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, Los Angeles Region 4 (RWQCB), California State Lands Commission (SLC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality
Development Types
Other (No development nor ground disturbance will occur)
Local Actions
NPDES Permit for Algae and Aquatic Animal Invasive Species Control
Project Issues
Biological Resources, Hydrology/Water Quality
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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