Aquatic herbicide application is scheduled to be carried out in specific management areas of Payette Lake for the control of Eurasian watermilfoil between September 10-11, 2026, based on water and weather conditions.
Applications are anticipated to start September 10, 2026 See below map.
There will be no restrictions for potable water use, swimming or fishing.
There will be no restrictions for irrigation of turf.
There will be food crop and non-food crop irrigation
water use restrictions in effect after treatment.
Additional updates will be provided.
Please see below for additional information.
NOTICE OF 2026 PAYETTE LAKE, IDAHO
EURASIAN WATERMILFOIL TREATMENT
Dear property owners and lake users,
Eurasian watermilfoil has been identified as a significant invasive species within Payette Lake, Idaho and is known to negatively affect the beneficial use of a waterbody. As such, an aquatic herbicide treatment is planned for specific areas of Payette Lake between September 10-11, 2026 based on water and weather conditions. The treatment timing was selected to maximize treatment efficacy when Eurasian watermilfoil is actively growing. Specific areas of the lake will be treated with liquid florpyrauxifen-benzyl (ProcellaCOR EC, USEPA Registration # 67690-80). This notice is being posted to Eurasian watermilfoil management areas and within 1/4 mile of management areas.
The following water use restrictions will apply:
Irrigation Use of Water: Do not irrigate established food crops until water use restrictions are lifted. Do not irrigate other non-food crops, such as landscape ornamentals, until water use restrictions are lifted. There is no restriction for irrigation of turf.
Recreational Use of Water in Treatment Areas: There are no swimming or fishing restrictions within the treatment areas.
Potable Water in Treatment Area: There are no restrictions on consumption of treated water for potable use or by pets or other animals.
For up to date information on water use restrictions during and after treatment, treatment date and treatment location, please visit the Idaho State Department of Agriculture's and the applicator's websites:
Please contact Tom Moorhouse, Aquatic Pest Control Adviser with Clean Lakes, Inc., (208-929-2757) or Noxious Weeds, Idaho State Department of Agriculture (208-332-8667), with any questions.
For information related to the aquatic herbicide ProcellaCOR® that will be used, please go to the following link where the herbicide label and Safety Data Sheet are available for review:
Additional location information is available at the Idaho State Department of Agriculture website that provides an interactive map at the following link.
