Eurasian Milfoil Treatment Tomorrow Tuesday June 28th

Aquatechnex biologists will be treating portions of Loon Lake tomorrow Tuesday June 28th with aquatic herbicides to target Eurasian Milfoil.  Areas that have been identified with milfoil infestations are shown on the map page you can access by clicking on that link above.  There are water use restrictions that will be in place as the treatment is performed.  Renovate herbicide will be used, it is a granular product.  There is a 24 swimming precaution that applies only to those areas mapped.  There is also a short restriction on use of the water from these treatment areas for irrigation or potable uses that generally last 3-5 days.  We will post the all clear here when sampling shows levels down.

The team will be posting signs on affected properties tomorrow morning at your shoreline or dock and treatment will begin shortly after that.  They should be clear of the lake by mid afternoon if all goes well.

Please note that water use restrictions only apply within the areas on the map, please review that map to see if your property is affected.  We will not be posting properties that are outside the treatment area.




Treatment Update

Portions of Loon Lake will be treated with Aquatic Herbicides to combat Eurasian Milfoil early this week.  At this point the plan is to travel to Loon Lake on Monday afternoon, posting of the lake will be performed Monday evening or Tuesday morning depending on the team’s arrival.  Please refer to the treatment map link on this page to locate your home and determine if you are in the treatment area.  We will update this site tomorrow but treatments are expected to occur on Tuesday.

Public Notices Arriving at Your Home

You will in short order be receiving a notice from Aquatechnex regarding this year’s Loon Lake Eurasian Milfoil Control Program.  This notice is a form that the Washington Department of Ecology Permit requires and it provides information that they specify.

We have just completed the early summer survey of the lake, and we will be posting an interactive map here in the next day or so.  The purpose of this map will be to allow you to see where the actual treatments are in relationship to your home or cabin on the lake.  The treatment polygons will also have a “buffer” around them, this will visibly show you where the water use restrictions are in place after the treatment.

We will be using a Color Code system to help you understand treatment restrictions.  Prior to treatment, the polygons where the herbicide will be placed will be colored yellow.  On the day of treatment, the color will change to red signifying that treatment has occurred and restrictions are in place.  When the sampling shows restrictions can be lifted, we will change the color again to green.

You will be able to zoom in and out, locate your property and see where you are in relationship to actual treatments.  We will also be posting signs on your shoreline just before treatment.

Update on Summer Work, 2016

Aquatechnex biologists visited the lake and toured the shoreline to determine if the aquatic plant growth in the lake was ready to perform a full blown aquatic vegetation survey.  We observed areas of fairly dense Eurasian Milfoil and expanding populations of Curly Leaf Pondweed, another invasive aquatic weed that seems to be on the march in the lake. Based on this evaluation we intent to complete a survey of the lake in the next two weeks and report this to the Loon Lake LMD Board.

We will be using a hydro-acoustic mapping system initially to detect and map the shapes and density of the aquatic plant communities present in the lake.  We will then visit these zones and determine if there are noxious aquatic weeds present at densities that required treatment.  We anticipate performing the first treatments before Fourth of July weekend and we will have maps available here as well as additional information on the treatments.

Two Washington Lakes Freed From Eurasian Milfoil

Over the past three years, Aquatechnex biologists have been assisting agencies in Washington State management the invasive aquatic weed Eurasian Milfoil.  Two of these major projects have reduced the Eurasian Milfoil populations from in excess of hundreds of acres to scattered plants that divers can easily remove.

Lake Tapps is a 22oo acre reservoir off the White River in suburban Seattle Washington.  This shallow system was established to produce hydro power, but relicensing costs prompted the utility to sell the system to the Cascade Water Alliance.  The lake has for years been fully developed with lake front homes.  Eurasian Milfoil had been introduced and expanded to the point of dominating the entire littoral area of the lake.

The key to targeting this infestation was to develop and implement a plan using two aquatic herbicide formulations that focus on Eurasian Milfoil.  In 2010, our team implemented a treatment program with Sonar Precision Release aquatic herbicide.  We made three applications at two week intervals and monitored the levels present to ensure exposure over 6-8 weeks.  That treatment focused on all of the infested bays on the lake system. provides a summary of this program.  In 2011, our team switched our focus to areas that were smaller and more exposed to dilution.  We selected Renovate OTF, a granular controlled release formation of Triclopyr, this product is selective for Eurasian Milfoil.  At the start of 2012, the lake is free of this noxious weed, levels are so low that diver removal will be adequate to move forward. provides more background.

The second system is Lake Stevens north of Seattle.  This 1200 acre lake system had approximately 135 acres of solid Eurasian milfoil at the start of the 2011 summer season.  The plan developed for this project called for the use of Renovate OTF.  Aquatechnex team targeted this growth using precision application systems.  At the mid point in the 2012 season, survey efforts have shown that only scattered plants remain and diver actions again will be used to remove the remaining plants.

These technologies were used by our firm on Lake Pend Oreille through work performed for Bonner County and funded by the ISDA program.  Many Sonar areas treated in 2006 remain free of Eurasian Milfoil to this day, and other sites are just now starting to show signs of increased impact.  Renovate OTF is also a preferred formulation of triclopyr herbicide because it can control Eurasian Milfoil using lower amounts of herbicide, something that new NPDES permits require

New Techology for Phosphorus Control in Lakes

Aquatechnex biologists have deployed a new technology to combat phosphorus pollution in lake and river systems in the Western United States.  Phosphorus is the limiting nutrient and excessive phosphorus loading in lake systems can lead to toxic algae blooms.  Phoslock is a technology that allows us to remove and sequester phosphorus.  See