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MARYLAND DEPARTMENT OF NATURAL RESOURCES OUR WATERS

Important Reservation System Update

The Maryland Park Service is launching a new, improved reservations system on Tuesday, February 24, 2026, for a faster, more intuitive booking experience. For more details, visit our newsroom .

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​​Algal Identification

  • ​Phytoplankton Home

​Harmful Algal Blooms

  • Ecosystem disruptive
  • Fish-Killing
  • Human/Animal Health

Harmful Algal Blooms in Maryland

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​Heterosigma Distribution

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Maryland Department of Natural Resources
580 Taylor Ave.
Annapolis, MD 21401
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