Public Health Advisory: Crystal Lake Update

The E. coli and fecal coliform levels in Crystal Lake are within normal limits, according to the most recent test results collected on July 3, 2020.

A previous water sample taken Wednesday, July 1, exceeded acceptable bacteria levels at a freshwater beach. We test for E. coli and fecal coliform. The accepted level of E. coli for a single sample is 235 cfu/100 ml or below. The accepted level of fecal coliform is 200 cfu/100 ml or below. (CFU stands for colony-forming units, the unit of measure used for samples like this.)



Crystal Lake July 1

Crystal Lake July 3

E. coli

235 cfu/100 ml

Above 1600 cfu/100 ml

72 cfu/100 ml

Fecal Coliform

200 cfu/100 ml

Above 1600 cfu/100 ml

88 cfu/100 ml


As previously determined, the Crystal Lake bathing beach has been closed for the summer this year and will remain closed.

The previous Public Health Advisory issued on July 3 is available here:

( View PDF )

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