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Tumwater lake managers discuss trial of ‘muck biotic’ treatment, defer approval pending cost details
Summary
The Lake Management District steering committee reviewed the contractor's 2026 treatment plan — including herbicide treatments for lilies and a pilot 'muck biotic' product — but deferred formal approval until the contractor supplies cost and frequency estimates; members raised oxygen-depletion and aeration concerns for the biotic trial.
The Lake Management District steering committee in Tumwater spent its March meeting reviewing the contractor's proposed 2026 treatment plan and a proposed pilot of a microbial "muck biotic" product intended to reduce sediment and improve boat access.
Staff summarized the contractor's recommendations: contact herbicides (diquat/endothal) for floating bladderwart, targeted systemic treatment (fluridone/Sonar) for fragrant water lilies and a pilot application of a muck biotic at the boat-launch frontage at Dana Day's property. Committee members said they support testing a small area but repeatedly asked for cost, application frequency and environmental…
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