The attached map serves as an interactive catalog of all of the reported blooms on Cayuga Lake in 2018. Click on an icon to see important information including a picture of the bloom, location, and results when/if they become available. Yellow icons represent “suspicious” blooms, orange icons represent “confirmed” blooms, and red icons represent “confirmed with high toxins” blooms. Map results are cumulative. It’s important to note the date of sampling because blooms are transient by nature and can disappear in as little as a day. We do not track bloom duration.
Cyanobacteria (blue-green algae) may produce a variety of chemicals that are harmful to other species, including humans. The most common harmful chemical found in New York is microcystin. Detailed toxicity studies have not been performed, and there is not yet a consensus on acceptable exposure levels. The New York State Department of Health (NYSDOH) has set upper limits for public drinking water supplies at 0.3 ug/L or parts per billion (ppb) and for public swimming beaches at 4.0 ppb (EPA, 2017). The New York State Department of Environmental Conservation (NYSDEC) defines a “bloom with high toxin” as 20 ppb near the lake shore and 10 ppb in open water (NYSDEC HABs Program Guide, Section 3).