Endothall Treatment

⚠️ In an effort to control aquatic growth during the upcoming warmer temperatures, Kennewick Irrigation District will be applying an Endothall treatment to our canal system on June 18th.

Endothall specifically targets aquatic plants and algae so it is not harmful to yard grass, plants and trees.

What is Endothall?

Endothall is a contact herbicide that prevents certain plants from making the proteins they need. Factors such as density and size of the plants present, water movement, and water
temperature determine how quickly endothall works. Under favorable conditions, plants begin to weaken and die within a few days after application.

KID Aquatic Herbicide and Algaecide Application Notice:

The Kennewick Irrigation District (KID) will apply aquatic herbicides and algaecides to the entire irrigation canal and lateral system for the control of aquatic weeds and algae. The products to be used are Nautique (Copper Ethylenediamine Complex and Copper Triethanolamine Complex), Captain and Captain XTR (Copper Ethanolamine Complex), Copper Sulfate Crystals (Copper Sulfate Pentahydrate), Cascade (Dipotassium Salt of Endothall), Teton (Mono Salt of Endothall), Argos (Copper Ethanolamine Complex), SeClear (Copper Sulfate Pentahydrate), F-30 (Copper Sulfate Pentahydrate), and Green Clean Pro (Sodium Carbonate Peroxyhydrate). All herbicide applications will take place between the dates of 01/01/2021 and 12/31/2021 under the Washington State Department of Ecology Permit WAG-991002A. Applications will be at the inlet to each canal and lateral, as well as applicable locations within the canal and lateral system. Application sites will be posted in accordance with Permit WAG-99102A. Irrigation water within the delivery system is intended for agriculture purposes only and is not intended for recreation, aquaculture, human and/or animal consumption or use. Aquatic Herbicides will be applied under the direction of Jason McShane, P.E., KID Engineering/ Operations Manager, (509) 586-6012, and Danielle Edelman, Washington State Department of Ecology Water Quality Program, PO Box 47600, Olympia, WA 98504, (360) 407-7118.

Source: https://www.kid.org/2021/06/10504/