Zostera japonica management on commercial clam beds in Willapa Bay General Permit

We issue coverage under this general permit when shellfish growers decide that using an herbicide (imazamox) to control the non-native eelgrass Zostera japonica on their commercial clam beds (excluding geoduck and oysters) is the method of managing this class C noxious weed that they would like to use. Physical and mechanical methods of Zostera japonica control are not regulated by this permit.

This permit is a combined National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit. The permit was last modified on April 5, 2017, and expired on May 2, 2019.

Permit Reissuance

We are pleased to announce that the draft Zostera japonica Management on Commercial Clam Beds in Willapa Bay General Permit (permit) is available for public comment. We invite comments on the draft permit documents beginning Sept.18, 2019 until 11:59 p.m. on Nov. 4, 2019​. We will publish a Response to Comments as an appendix to the fact sheet to address comments submitted during the public comment period.​

In addition, we have a blog post that explains more about this permit.

​How to provide comments

We will accept written comments from Sept.18, 2019, until 11:59 p.m. on Nov. 4, 2019. Comments should reference specific permit text when possible. You may submit written comments:

  • Online: Submit your comments through our online comments form (preferred method)
  • By mail: Jon Jenning​s, Washington State Department of Ecology, PO Box 47696, Olympia, WA 98504-7696
  • In person: We held public hearings Oct. 21 and 22 to provide the opportunity for in-person public testimony

Workshops and hearings

We hosted workshops immediately followed by a public hearing at the following dates and locations:

During the workshops, we explained changes proposed and answered questions. The hearing began after the public workshop and ended when all individuals who wanted to had provided their oral testimony. Written comments will receive the same consideration as oral testimony.

Permit documents

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Annual reports and pre-treatment plans

NOTE: The following information provides annual operations report information. We have recently re-developed our Water Quality permit database (PARIS). Soon, these reports will be transitioned over and only available through PARIS, they will no longer be posted here. Reports posted here will be removed once they are available through PARIS.