Pesticides Currently Allowed for Use in Washington State Waters

Alum (Note: alum is not registered as an algaecide, rather it works as an algaestat, helping to suppress algae blooms by inhibiting the nutrient phosphorous.)
Barley Straw
Biological Water Clarifiers
Calcium Hydroxide and Carbon Dioxide (PDF) (Note: calcium hydroxide and carbon dioxide is not registered as an algaecide, rather it works as an algaestat, helping to suppress algae blooms by inhibiting the nutrient phosphorous.)
Green Clean™ and Green Clean Pro™
Hydrothall 191
PAK 27™ (PDF)
Shading Products

Example Pesticide Labels for Irrigation Permit Pesticides:

Chemical Name	Example Labels (PDF)*
Acrolein	Magnacide H® Herbicide 2008 Special Local Needs Label
Copper	K-Tea Algaecide Cutrine® Plus Alaecide/Herbicide Cutrine® Ultra Algaecide / Herbicide / Cyanobacteriocide
Fluridone (not included in current permit, but may be included in future permit)	Sonar PR Herbicide Sonar SRP Herbicide Sonar Q Herbicide Sonar A.S. Herbicide
Imazapyr (not included in current permit, but may be included in future permit)	Habitat Herbicide
Sodium Carbonate Peroxyhydrate (not included in current permit, but may be included in future permit)	GreenClean Pro Algaecide
Xylene	Chem T Aquatic Weed Killer

* Please be aware that the electronic copies of these example labels are provided here for information only.