Application Date:  July 8, 2026

Sylvia Lake was treated with aquatic herbicide/algaecide 

Product(s) used: Hydrothol 191

Active ingredient(s): DMA Endothall: 53.0%

Plants/Algae targeted: Plants and algae 

Location of treatment(s): Alternating areas of the shoreline

The applicator will post signs in the treated and potentially affected areas. The signs will describe any water use restrictions or advisories. No swimming restrictions, but please wait 2 hours after treatment time (11am)

If you have further questions, please contact:  Northwest Lake Cleaning LLC, Mike White (425-941-8083) 

This herbicide treatment is regulated under a permit issued by the Washington State Department of Ecology.  Permit No. WAG994004 

Scan with QR reader to go to permit web page