Aquatic Plant & Algae Management General Permit
We issue the Aquatic Plant and Algae Management (APAM) General Permit to allow chemical treatments for the management of aquatic noxious weeds, native nuisance plants, and algae. These chemicals are limited to a specific list of aquatic-labeled herbicides, algaecides, biological water clarifiers, adjuvants, marker dyes, shading products, and phosphorus sequestration products. They can be used directly into fresh water (lakes, streams, and rivers) or along shorelines, roadsides, dikes/levees, and ditch banks.
The current permit went into effect on April 21, 2021, and expires on March 21, 2026.
Join our email list to receive email updates about this permit.
We've updated our sign template to use more icons to help applicators warn people about any restrictions.
Map shows specific locations where use of aquatic herbicides is subject to different timing restrictions to protect fish and other priority species. Click image to go to WDFW's map.
Related links
• Ecology Grant Programs for Aquatic Invasive Plants and Freshwater Algae Control
• Ecology Aquatic Weed Technical Assistance
• Department of Health Harmful Algae Bloom Toolkit
• Washington State Toxic Algae Data
• Ecology Permit and Reporting Information System (PARIS)
Contact information
Questions about the permit and implementation:
Shawn Ultican
Aquatic Pesticide Permit Specialist
shawn.ultican@ecy.wa.gov
360-870-3492
For assistance with applications, transfers, termination, and WQWebPortal:
Eman Jabali
General Permit Administrator
aquaticpesticideperm@ecy.wa.gov
564-233-9135