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Lake Erie’s summer harmful algal bloom season came to an end in late October

The maximum bloom severity in 2024 vs 2025.Lake Erie’s summer harmful algal bloom season came to an end in late October, and NOAA and partners have issued the final bulletin. The 2025 western #LakeErie cyanobacterial bloom had a severity index of 2.4, which is considered a mild bloom, and less intense that 2024.