Agencies to Consider Tahoe Keys Weed Control

January 9, 2022

The Tahoe Regional Planning Agency (TRPA) will host a public hearing January 26 to decide on the next steps for the Tahoe Keys aquatic weeds test project.

This project proposed by the Tahoe Keys Property Owners Association (TKPOA) will analyze which combination of treatment methods best protect Lake Tahoe by most effectively controlling aquatic weeds in the Tahoe Keys lagoons and halting their spread into the lake.

TRPA, as co-lead agency with the Lahontan Water Board, will consider certification of the Final Environmental Impact Statement (EIS), which evaluates the potential environmental impacts of the proposed control methods test and project alternatives, and approval of a permit to begin the tests.

“The aquatic invasive weeds have continued to spread, despite our investments of millions of dollars to contain and remove the plants,” said Greg Hoover, Water Quality Manager for the Tahoe Keys Property Owners Association. “Recent collaborative efforts to slow the spread into Lake Tahoe have shown some promise, but new control methods such as aquatic herbicides shown to be safe and successful in similar settings need to be tested to help prevent widespread infestations around the lake.”

The aquatic weed infestation covers over 90 percent of the Tahoe Keys lagoons in the summer and provides sources of continuing infestations in the lake itself including popular recreation areas like Emerald Bay. The invasive weed growth degrades water quality and clarity, disrupts the natural ecosystem, impedes boating and recreation and releases nutrients that can contribute to harmful algal blooms. Despite considerable investment by property owners, the weeds continue to spread and officials and the scientific community are urging immediate action.

The proposed test project will weigh myriad approaches:

  • Testing EPA-certified aquatic herbicides
  • Innovative methods such as aeration and ultraviolet light. Lake Tahoe was the first location to use ultraviolet light to treat aquatic weeds, but it has only been used on a small scale.
  • Small-scale control methods (such as bottom barriers and diver-assisted suction)

Aquatic weeds affect multiple areas around Lake Tahoe. The Tahoe Keys lagoons encompass over 170 acres (including 900 private docks) and the largest commercial marina on Lake Tahoe supporting private, public recreational, and commercial launching and boating, and therefore accounts for much of Lake Tahoe’s boat traffic.  Due to the sheer size of the infestation and the number of boats leaving the area, the Tahoe Keys are a likely source for new infestations around the lake.

“This is not a TKPOA problem, this is a lake-wide issue,” said Tahoe Regional Planning Agency Executive Director Joanne S. Marchetta. “We’ve seen public and private partners come together to improve and fund elements of this environmental process because everyone understands that we are at a tipping point. The results of this decision will influence the future of Lake Tahoe for years to come.”

The TRPA public hearing will provide an overview of the proposed project, project alternatives, and the analysis of potential environmental impacts. Thousands of public comments have been included in the final analysis and additional opportunity for input will be provided during the virtual meeting. 

TRPA Governing Board Meeting

January 26, 2022

Materials will be available on Wednesday, January 19 here

Learn more about the project at www.tahoekeysweeds.org.

In addition, the Lahontan Water Board will be considering resolutions and orders related to the Tahoe Keys Lagoons Aquatic Weed Control Methods Test during their January 12-13, 2022 meeting. For notices and additional information on the Lahontan Water Board meeting, please visit the Lahontan Water Board website: Lake Tahoe Programs | Lahontan Regional Water Quality Control Board (ca.gov)

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