06/20/2026
Our partners at the Green Lake Association have launched their weekly Green Lake Beach status map! Check back often to keep up to date on the status of our beaches!
The Green Lake Association is excited to launch our new weekly Green Lake Beach Status Map, developed in partnership with the Green Lake County Public Health and the Green Lake Sanitary District.
Beginning today, we'll post an updated map every Friday by noon, providing the latest information from the GLA's blue-green algae (tested on Thursdays) and GLSD's E. coli (tested on Mondays) monitoring efforts at public access points around Green Lake.
This map is designed to provide residents and visitors a snapshot of current conditions to help everyone make informed decisions about enjoying the lake.
How we monitor for blue-green algae:
Each week, the GLA's program team conducts a visual assessment and collects water samples from locations around Green Lake to look for signs of a blue-green algae bloom.
During our visual assessments, we look for:
-Surface scum
-Streaking on the water
-Blue-green "spilled paint" or "pea soup" appearances
-Reduced water clarity
Visual assessments are complemented with rapid field screening tests for Anatoxin-a and Microcystin, the two most common toxins associated with blue-green algae blooms, using rapid field screening tests. While blue-green algae, also known as cyanobacteria, can produce other toxins, these are the most frequently encountered and provide valuable information for public health decision-making.
We also consider factors such as wind, temperature, and precipitation, all of which can influence bloom development and movement around the lake.
This monitoring program is also building a long-term dataset that will help us better understand how weather and water quality influence blue-green algae conditions overtime.
Stay Connected
Check our Facebook or Instagram page every Friday for the latest Beach Status Map.
If the Public Health Department issues an advisory or closure, we will send an email notification to our subscribers as soon as possible.
To make sure you receive the latest updates, sign up for our newsletter today: https://www.greenlakeassociation.org/signup