Division of Water Quality

Blue-Green Residue: Harmful Algal Bloom Examples

Harmful algal blooms may look like blue-green residue. Click on images for a larger view.

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Harmful Algal Blooms Example: "Blue-Green Residue" from Yuba Lake in 2019

Harmful Algal Blooms Example: "Blue-Green Residue" also from Yuba Lake in 2019

Harmful Algal Blooms Example: "Blue-Green Residue" from Panguitch Lake in 2018

Harmful Algal Blooms Example: "Blue-Green Residue" Also from Panguitch Lake in 2018

Harmful Algal Blooms Example: "Blue-Green Residue" from Scofield Reservoir in 2016. Includes dead fish lining the shoreline.

Harmful Algal Blooms Example: "Blue-Green Residue" from Scofield Reservoir in 2018