2019 Milfoil Treatment Plan

Cascade Water Alliance, which owns and operates the Lake Tapps Reservoir, conducted two milfoil surveys this spring. Based on these surveys, Cascade is announcing its 2019 planned milfoil treatment.

The areas designated to receive treatment are marked on the map below. Treatment will occur during July. Residents in planned treatment areas will be notified regarding time and dates of treatment prior to actual application. There will be some chemical treatment as well as divers pulling milfoil.

Treatments will include one or more of the following: aquatic herbicides RenovateOTF (triclopyr), Littora (diquat), and florpyrauxifen-benzyl (ProcellaCOR). The Washington Department of Ecology recommends: not swimming in the area treated by Renovate OTF for at least 12 hours post treatment and for 24 hours where Littora has been used; and no irrigation for 24 hours where florpyrauxifen-benzyl (ProcellaCOR) is used (As a reminder, pumping or drawing irrigation water from Lake Tapps is never permitted).

For aquatic plant management options for lakefront property owners at Lake Tapps, see Aquatic Plant Removal or Control, which includes the Washington Department of Fish and Wildlife’s Aquatic Plants & Fish Pamphlet.

Milfoil is found in most Northwest lakes. It has been in Lake Tapps on and off for years. Milfoil is no longer classified as a noxious weed, and therefore, Cascade has no legal obligation to address milfoil. However, Cascade is as interested as residents and recreation enthusiasts in keeping the reservoir clean and safe. This is why, over the past decade, Cascade has treated and addressed milfoil management on a regular basis at its own cost. Cascade does not manage natural vegetation.

In addition, Cascade has teamed up with the Tacoma-Pierce County Health Department to offer residents Tappswise, a natural yard care and septic system maintenance program to keep Lake Tapps clean and healthy. For more information visit www.cascadewater.org

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