Irrigation System Aquatic Weed Control Permit

The permit allows the regulated use of aquatic pesticides, marker dyes, and nutrient inactivation products to control the growth of aquatic plants and algae within irrigation systems, helping them maintain the capacity to convey water.

The Irrigation System Aquatic Weed Control (ISAWC) permit was last issued in 2012 and is currently under administrative extension.

The current administrative extension will allow us to develop an environmental impact statement to assess permitted chemicals allowed for use within irrigation systems and identify mitigation actions to reduce the potential of adverse environmental impacts. We plan to reissue the ISAWC permit in 2019.

Current permit documents

Apply for coverage

Due to the current administrative extension of the ISAWC permit, no new applications for coverage will be accepted until the permit is reissued.

Reissuance process

We are in the process of reissuing the ISAWC permit and developing an Environmental Impact Statement (EIS) to help inform the process. Opportunities for public participation will be provided during both the reissuance process and EIS development.

To stay informed on when these opportunities for public participation will take place, please sign up for the irrigation system aquatic weed control listserv. We currently expect to have a draft ISAWC general permit available for public review in the spring of 2019.