Aquatic Herbicide Applications for the control of Eurasian watermilfoil (EWM) were conducted June 3, 2016.
Potable water and irrigation water use restrictions are no longer in effect.
No further water use restriction information will be updated on this site. Please see maps below for additional details.
An aquatic herbicide application to treat the aquatic noxious weed Eurasian watermilfoil is planned for Cocolalla Lake (Bonner County, Idaho) the week of May 30, 2016. The aquatic herbicide DMA 4 IVM (a liquid 2,4-D, EPA Registration # 62719-3) will be applied to up to 89 acres in Cocolalla Lake to control Eurasian watermilfoil. Irrigation and drinking water restrictions will be in effect lake-wide until herbicide residue levels in the water are within levels specified by the herbicide label. Homeowners who use water from the lake for drinking or irrigation are advised to not use lake water until herbicide residue samples indicate it is acceptable to do so. Restrictions will be in effect for a minimum of 14 days and possibly more depending on residue results. For up-to-date information about treatment plans and water use restrictions visit the applicator’s website:www.cleanlake.com/2016idahoewmtreatments.html.Contact Tom Woolf, Idaho State Department of Agriculture, Aquatic Plant Program Manager, with any questions: 208-608-3404 or email atthomas.woolf@agri.idaho.gov.
NOTICE
WATER USE RESTRICTION AREA
An aquatic herbicide application is planned for areas of Cocolalla Lake the week of May 30, 2016. DMA 4 IVM (a liquid 2,4-D, EPA Registration # 62719-3) will be applied to up to 89 acres in areas of Cocolalla Lake to control Eurasian watermilfoil.
Water Use restrictions will be in effect lake-wide for households utilizing water from the lake for a minimum of 14 days and possibly more depending on herbicide residues. Refer to the applicator’s website below for up to date water use restriction information. Restrictions on water use will be as follows:
Potable water: Functioning potable water intakes must be turned off until the 2,4-D levels are determined to be 0.07 parts per million (ppm) or less by laboratory analysis.
Irrigation: Treated water may not be used for irrigation until 2,4-D levels are determined to be 0.1 parts per million (ppm) or less by laboratory analysis (immunoassay). There is no restriction on use of water from the treatment area to irrigate established grasses.
Recreational Use of Water in treatment Area: There are no restrictions on use of water in the treatment area for recreational purposes, including swimming and fishing.
Animal Consumption: Do not intentionally use water from the treated area for animalconsumption until laboratory analysis indicates that restrictions are lifted. This does not apply to incidental exposure of animals to treated water.
See the website below for a detailed map indicating where restrictions will be in effect. Home owners near treatment areas who use water from the lake for drinking or irrigation are advised to not use lake water until herbicide residue samples indicate that levels in the water are within acceptable use levels specified by the herbicide label. For up-to-date information about treatment and residue levels visit the applicator’s website at: www.cleanlake.com/2016idahoewmtreatments.html
Contact Tom Woolf, Idaho State Department of Agriculture, Aquatic Plant Program Manager, with any questions: 208-608-3404 or email atthomas.woolf@agri.idaho.gov.
Areas highlighted in green in the map below indicate areas treated on June 3, 2016.
No water use restrictions are in effect at Cocolalla Lake.
Legend
Yellow Polygons - Planned treatment and water use restriction area
Red Polygons - Treated and water use restriction area
Green Polygons - Treated area with no water use restriction
