Over the last two weeks we have seen a gradual diminishing of blooms around the lake. However, we did have three reports of potential blooms yesterday with the 87 degree weather. We also went out on Sunday September 22nd after the bloom conditions of the previous two days and sampled for toxins and blue green algae concentrations in several different locations and depths to better understand the ambient (general levels) of both BGA and the associated toxin. The good news is that the toxin levels at each of the locations were below the 4 ug/L level that would cause the DOH to close a public swimming beach. The other good news was that the BGA levels were low: 1-2 ug/L. However, the concerning part was that we had detectable levels of toxin in the water even though the BGA levels were low. There were dots in the water in each location that we sampled. We are seeing a little more algae diversity in the water with harmless green algae and diatoms starting to show quantifiable levels.
Based on this information - please continue to use your visual indicators before entering the water. Please do the same for your pets. We are finally starting to see some of the results from the DEC sponsored toxin testing that occurred earlier this season and it is confirming that when we have bloom level concentrations we are seeing high toxin levels in those samples.
Our public water supplies continue to show nondetectable levels of the toxin in the finished water indicating that they are adequately treating the water for human consumption. Users of private water systems (those not on municipal water, who are using their own surface water intake or nearshore well) need to continue to use caution and make sure their treatment system can adequately treat for the toxin. If you are seeing blooms in the water, it is recommended that you do not use your private water system. We did sample for toxins at an approximate 12 ft water depth because private water supplies intake lines are typically at that depth. Each sample came back showing toxin levels in the 1-3 ug/L range. Work with your private water treatment system provider to make sure the system is functioning adequately.
Questions? Send to HABS@canandaigualakeassoc.org.
Kevin Olvany Lindsay McMillan Watershed Program Manager Association Director Canandaigua Lake Watershed Council Canandaigua Lake Watershed Council
After a “quiet” week with minimal harmful algal bloom reports from volunteers and the public, activity picked back up again today, with several reports and samples collected from the west side of the lake. Photos coming in showed areas of surface streaking and shoreline accumulations of algae from several spots around the lake. We are starting to get more algae bloom reports from the southern half of the lake.
And while the sunny, calm, warm weather forecasted for the next several days will be great for getting in those end-of-summer activities, it is also ideal conditions for blue green algae (cyanobacteria) to pop up. As we cannot predict when or where blooms may appear, please continue to use your visual indicators before recreating in the lake.
September has been the month when we have experienced our most significant bloom events, and last year was no exception, with many blooms being designated as “Confirmed with High Toxins”. This year, the DEC will not be releasing toxin (microcystin) values associated with the samples collected until the end of the season, but is updating their NYHABS webpage when a bloom is confirmed with high toxins.
What does this mean for our drinking water?
The 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) are working alongside the Geneva District Office of the Health Department and the New York State Department of Health to monitor the public drinking water for the presence of toxins associated with harmful algal blooms. Samples of the public drinking water are collected twice a week and sent to a State approved laboratory to determine if toxins are present. To date, all finished water samples have been non-detectable for the microcystin toxin. If there is a detectable value in the finished drinking water (above 0.3 micrograms per liter), the DOH, in cooperation with the affected public water system, will notify the public when alternative water should be used for drinking, making infant formula, making ice, brushing teeth and preparing food. CLWA and the Canandaigua Lake Watershed Council will strive to assist in getting the word out from the DOH in the event that this situation arises.
Users of private water systems (those not on municipal water, who are using a surface water intake or nearshore well) face further challenges when there are high levels of blue green algae and cyanotoxins present in the lake due to the varying capabilities of household treatment units to remove cyanotoxins. Private system users are encouraged to actively monitor their waterfront and pay close attention to the HAB reports in their area in an effort to make informed decisions on their drinking water source. With the increased reports of algae in the southern half of the lake, where there are private water supply systems- individuals need to be cautious and work with their water treatment system company to determine if their system will be sufficient.
Check out the following resources for more information:
On another note…. What about that lake foam?
If you spent any time on the lake over the last week, you may have noticed that we’ve had some significant lake foam! The foam is something we get asked about a lot, and studies over the years have contributed the foam to a breakdown in organic material (a die-off of plants, algae, zebra/ quagga mussels) which releases a surfactant in the water that is agitated by wave and wind action, causing the foam. More information can be found here.
Recently, CLWA launched a new lake foam research and we are actively working with a pair of researchers to further examine the composition of the foam being seen on the lake after HAB events. As a part of this study, several foam events will be sampled over the next few months, and we can use your help! We now have an online portal for the public to report foam observations, and we are beginning to log the frequency and extent of the foam. If you see a significant foam event and are able to take a photo, please consider uploading a report using the following link: https://www.canandaigualakeassoc.org/foam-reporting/. Foam observations will be recorded for research purposes and the images coming in are being used to determine our sampling schedule.
As always, we appreciate all your eyes on the lake! Thanks for sending in reports and being an active part of our watershed community.
As we transition through September and into October, please continue to follow the recommendations of the NYS DEC and NYS Department of Health before recreating in the lake. Please remember that pets are especially vulnerable to harmful algae blooms. Check out the DEC photo gallery for examples of what to look for with blue green algae.
The maps that are generated from the shoreline monitoring program and the DEC’s NYHABS page show the most current HABs reports.
Questions? Send to HABS@canandaigualakeassoc.org.
Kevin Olvany Lindsay McMillan Watershed Program Manager Association Director Canandaigua Lake Watershed Council Canandaigua Lake Watershed Council
Yesterday we experienced significant streaking and surface scum accumulations of blue green algae (cyanobacteria) along several shoreline areas. Twelve samples were collected as part of the shoreline HABs network and were brought to the Finger Lakes Institute for screening with the Fluoroprobe. If samples come back with high levels of blue-green chlorophyll a through this screening process (confirming bloom status), they will be sent on to the DEC’s designated lab for toxin analysis. While FLI results should be forthcoming in a few days, the toxin analysis can take much longer. This emphasizes the need to use extreme caution when recreating in the lake.
Although yesterday’s blooms were not experienced lake-wide, the areas they were observed were severe in some cases. Reported blooms were seen in coves, shallow beach areas, by docks, or trapped in corners of a break wall – all areas where blooms get pushed by wave and wind action. Unfortunately, these easy-access areas are also where people are most likely to enter the water or have their pets swim. This time of year, it may not be worth the risk of having pets swim in the lake. Even areas that look clear may not be low-risk.
With the cooler weather and periods of rain forecasted the next week to ten days, it may alleviate some of the chances of HABs – or it may not. We are still learning what triggers blooms, and we cannot predict when or where there will occur. However, we do know that they seem to pop on the calmest of days – days with no wind, and very little water movement to mix surface layers.
Please continue to follow the recommendations of the NYS DEC and NYS Department of Health before recreating in the lake. Please remember that pets are especially vulnerable to harmful algae blooms. Check out the DEC photo gallery for examples of what to look for with blue green algae.
As always, you can visit the maps that are generated from our shoreline monitoring program and the NYS DEC NYHABS page to see the most current HABs reports.
Each of the public water suppliers continue to sample their water and the treated water results are all non-detectable for the microcystin toxin.
Questions? Send to HABS@canandaigualakeassoc.org.
Kevin Olvany Lindsay McMillan Watershed Program Manager Association Director Canandaigua Lake Watershed Council Canandaigua Lake Watershed Council
