Water Quality Update for October 1, 2021

WATER QUALITY UPDATE For Friday, October 1 2021


HAB Reports this week: · 22 surveys performed · 2 Confirmed Blooms

Welcome to the 14th edition of your Friday Water Quality Update! These updates are crafted in partnership with CLWA and the Canandaigua Lake Watershed Council (intermunicipal watershed organization consisting of the fourteen watershed and water purveying municipalities). We are in the final days of the Volunteer Shoreline Harmful Algae Bloom Program, with an official end date of Sunday, October 3rd. Next Friday will be our last weekly water quality update. We hope you have found these weekly reports to be helpful throughout the season.

Current Water Quality

So far this week, two blooms have been reported. The first report of a small, localized bloom came in last weekend on Saturday 9/25 in Crystal Beach. While this bloom was officially logged on last week’s reporting week, we received the results this week confirming the bloom was above the DEC threshold. See table results below, as well as well as our "Observations from a HABs Sampler" article. On Wednesday, October 29th, another small, localized bloom was observed along the waterfront of the Canandaigua Yacht Club. The volunteer reported one small isolated area of heavy "dots in the water" and surface streaking. The remainder of the shoreline was clear and free of blooms. A sample was collected and sent to the Finger Lakes Institute for analysis (See table results, below). We had one other bloom reported on Monday 9/27 by the boat houses, but upon further investigation of the photos it appeared to be a mixture of duckweed/watermeal and aquatic plant fragments, not a bloom.




Municipal Drinking Water Test Results

For the first time this year, two municipal water treatment systems - the City of Canandaigua and the Village of Palmyra - had low but detectable levels of microcystin (the toxin produced by cyanobacteria / blue green algae) show up in the raw (untreated) water samples collected on Monday, 9/27. Samples of the finished drinking water (after treatment was applied) had non detectable levels of microcystin. This sampling was part of the proactive routine microcystin testing that all six Canandaigua Lake water purveyors (the City of Canandaigua, the Village of Newark, the Village of Palmyra, the Village of Rushville, the Town of Gorham, and Bristol Harbour) participate in for both raw (untreated) and finished (treated) drinking water. It's important to reiterate that the finished drinking water was reported as non-detectable in all drinking water systems, indicating that municipal water continues to be safe to drink. Results for the season are as follows:





Routine testing for microcystin in the municipal water systems on Canandaigua Lake is scheduled for a few more weeks. The State Department of Health will continue to work closely with the water purveyors to assess sampling needs moving forward. For more information, check out the HABs and Drinking water page on the CLWA website. As always, we encourage you to follow our reports on our website, and on the facebook page for further information.

More Information on Blue Green Algae

Click below for our Harmful Algae Bloom brochure.

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