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Most Poisonous Lake World Record
Anderson Lake, located in Port Townsend, Washington has the unpleasant distinction to be known as the most poisonous lake.

Since 2008, Anderson Lake has been plagued with soaring levels of anatoxin-a, a potent nerve toxin produced by blue-green algae. The safety threshold for the toxin, which can kill in four minutes after ingestion, is one microgram per liter; Anderson Lake readings were at 172,640 micrograms per liter.

Blue-green algae occurs naturally and is usually benign, but at times, certain types will begin pumping out toxins. Researchers at Oregon State University are securitizing types of blue-green algae that live in Anderson Lake to see if the cyanobacteria contains the same DNA as those commonly found in similar freshwater lakes.

 
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Impaired Waterway Status Helps Big Green Lake Gain Funding - The deepest lake in the state and one of the most fruitful and diverse is "impaired." With exotic species' being introduced to the lake in the mid 2000s and Green Lake struggling to improve, the paperwork was filed for the lake to be designated an impaired waterway in an effort to gain funding so improvements can be made.


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