WA less toxic than some others http://www.ecy.wa.gov/programs/wq/pl...t/aqua028.html Aquatic Plant Management: Aquatic Herbicides less toxic than some others http://www.ecy.wa.gov/programs/wq/pl...t/aqua028.html http://www.ecy.wa.gov/programs/wq/pl...t/aqua028.html http://www.ecy.wa.gov/programs/wq/pl...t/aqua028.html