We issue this permit to allow the use of imazamox and marker dyes on commercial clam beds (excluding geoduck) only in Willapa Bay for control of the non-native eelgrass Zostera japonica, which is a class C noxious weed.
Willlapa Bay commercial shellfish beds were historically sand/mud flats. The plant has colonized these beds, making it difficult to grow and harvest clams.
This permit is a combined National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit.
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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 available through PARIS.