It's now safe to fall into the Charles past the Longfellow again, at least in terms of cyanobacteria toxins

The Boston Public Health Commission reports the state has lifted its cyanobacteria advisory for the Charles River between the Longfellow Bridge and the Charles River Dam, including the Broad and Lechmere canals in Cambridge.

The state had issued an advisory about the microorganisms, also known as blue-green algae last month, warning the bloom posed a particular threat to dog and small children who might get into the river.

This morning, though, the commission said testing shows the threat has abated:

This advisory was put into place on September 24. Analysis of testing samples taken in the area on September 30 and October 7 demonstrated cyanobacteria levels below the state’s safe limit of 70,000 cells/milliliters (mL) of water.

On October 7 levels showed 35,000, 37,000, and 60,000 cells/mL for Broad Canal, Lechmere Canal, and Lederman Park, respectively. As this is the second consecutive result below the state’s threshold for unsafe conditions, the advisory is now lifted. The toxin microcystin was not detected in any of the three samples.