Traditional water quality metrics like chlorophyll A and fluorometer readings are unreliable for detecting toxic cyanobacteria, as demonstrated by EPA-affiliated scientists who analyzed 10 years of data from 72 monitoring stations across the five Great Lakes, finding that these methods fail to accurately identify phytoplankton species and quantities, creating a false sense of security about water quality.
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Deep Dive
Is your scientific data actually garbageAdded:
Now, you might be thinking, this guy sounds like he's talking sense, but is there any independent scientific proof?
Absolutely.
And it comes from the most authoritative source possible.
In January 2026, a group of EPA affiliated and funded scientists published a landmark paper in the Journal of Limnology and Oceanography Methods.
They analyzed 10 years of data from 72 monitoring stations across all five Great Lakes.
978 samples in total.
Comparing fluorometer readings to actual microscopy-based identification of what phytoplankton were present and in what quantities.
What they found was unequivocal.
Now, scientists have known for a while that fluorometers are not particularly reliable. And chlorophyll A is not a reliable metric. And so have the manufacturers of these devices.
They know about the flaws I've told you about. So, they've made every effort to try to develop more sophisticated equipment to overcome these limitations.
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