Archived Harmful Algal Blooms Map
Please note that cell counts from samples prior to 2015 should not be used for analytical purposes, as these were qualitative assessments based on live cell counts.
To view current HAB data please visit our HABs Map Page
To learn more about Harmful Algal Blooms (HABs) visit the Department of Natural Resources Phytoplankton Monitoring Program. To report algal blooms, please call (410) 260-8630, or report online using our Algae Bloom Sighting Report page.
Click on a station for more info and data:
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