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2026 Public Notice:
The Columbia Irrigation District applies aquatic herbicides and algaecides to the entire irrigation canal system in accordance with the Washington State Department of Ecology Irrigation System Aquatic Weed Control General Permit. The purpose is to minimize aquatic weed and algae growth to maintain unrestricted water flow within the delivery system. Products used will be Cascade (Dipotassium Salt of Endothall), Nautique (Copper Ethylenediamine Complex and Copper Triethanolamine Complex), Captain and Captain XTR (Copper Ethanolamine Complex), Copper Sulfate Crystals (Copper Sulfate Pentahydrate), Green Clean Pro (Sodium Carbonate Peroxyhydrate), Sonar H4C (Fluridone) and Sonar A.S. (Fluridone).
Treatments will be posted no later than 5pm one day prior to any treatment. Treatment will be under the direction of Joe Amend, CID Assistant Manager and the Washington State Department of Ecology Water Quality Program Central Regional Office at 1250 West Alder Street, Union Gap, WA 98903 (509)-575-2490.
Please contact CID for further information at (509) 586-6118.
Canal Treatment Calendar
The application sites will be at various sites along our canal starting at Wanawish Dam, West Richland. Waters within the Columbia Irrigation District’s delivery system shall be used for irrigation purposes only.
Canal Abbreviations:
MC- Main Canal
L1- Lateral 1 Canal
L2- Lateral 2 Canal
** Canals receive treated water from a Main Canal treatment.
Treatment(s):
Aquatic Pesticides Use:
Endothall- Herbicide and/or Algaecide
Copper- Copper Based Herbicide and/or Algaecide
Sodium Carbonate Peroxyhydrate (SCP) - Algaecide
Fluridone- Herbicide
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