Harmful Algal Bloom Report

Bloom Code 25-3489-B1

Where

Water Body Cayuga Lake
Latitude and Longitude 42.69531, -76.74064
Segment Lakeshore Segment Northwest 1: Sheldrake Point to Deans Cove
County Seneca
Extent Widespread or Lake-wide: The HAB is as far as you can see, and seems to affect the entire waterbody, or most or all of the shoreline.

When

Bloom Reported September 23, 2025 08:42 PM
Bloom Sampled September 23, 2025 08:42 PM
Microscopic Examination September 26, 2025

What

Bloom Genera [1]

Microscopy Present Dominant
Dolichospermum
Microcystis

Bloom Chemistry

Total Chlorophyll a 720.0 ug/L
Total Microcystin and Nodularins (EPA 546) [2] 455.0 ug/L
[1] Genera - plural of genus, a category of classification in biology that ranks between the family level and the species level. Because there are many different species of bacteria that are difficult to distinguish, it is more useful to classify bacteria by genus rather than species.
[2] Microcystin

Bloom Description

2025 PRIORITY SITE: Thirsty Owl Wine Company- identified by Seneca County Health Department as a sample-collection site. Volunteer Reports: Looked like mostly south of the zone. Calm, 69 degrees