News

Water Quality Update: August 21, 2026

August 21, 2026
LaBarr Farms

GENEVA, N.Y. – As we head into the second half of August, Seneca Lake continues to have no confirmed harmful algal bloom (HAB) reports, while low lake levels remain an area of concern. Pure Waters continues to monitor these conditions closely as we move into late summer.

Read the full interactive Water Quality Update for additional lake conditions, watershed news, upcoming events, and helpful resources, or view the PDF below.

Current conditions include:

  • Surface Temperature (Aug. 20): 74.4°F at 3.3 ft
  • Dissolved Oxygen (Aug. 20): 120% in the top 10 ft, dropping to well below 100% below that depth
  • Lake Level (Aug. 21): 445.43 ft
  • HAB Reports (Aug. 15–21): None reported

Monitoring data is provided through a partnership with the Finger Lakes Institute, NOAA, and Seneca Lake Pure Waters Association’s dedicated volunteer monitoring network.

Here’s What You Need to Know

While water temperatures have been cooler this year, we are entering the time of year when HAB activity has historically increased, particularly around Labor Day and into September. Lake users should continue watching for and reporting suspected blooms.

Low lake levels also remain a concern. The lake is now at essentially the same level it was at this time last year, before levels continued to decline into the fall. Dry conditions and the ongoing leak at the Seneca Falls dam could contribute to additional water loss. Boaters and shoreline property owners should be prepared for the possibility of continued low levels.

If you see water resembling pea soup, spilled paint, surface scum, or bright green streaks, avoid contact, keep pets away, and report the suspected bloom to NYSDEC and Seneca Lake Pure Waters.

Learn more about Pure Waters

To learn more about volunteering: https://senecalake.org/volunteer-opportunities/
To learn more about donating: https://senecalake.org/giving/

Seneca Lake Pure Waters Association is a 501(c)3 organization committed to preserving, protecting, and promoting the abundant resources of the largest Finger Lake. Seneca Lake is a source of drinking water, recreation, and economic opportunity for the greater community and its visitors. Our programs and partnerships make it possible to monitor water quality, educate the public, and evaluate threats to ensure the a healthy future for Seneca Lake and those who depend on it.