Calvert County Health Department

Local (410) 535-5400, DC Metro (301) 855-1353, Annapolis (410) 269-2216

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Blue-Green Algae

Blue-Green Algae: Microcystis aeruginosa

Microcystis aeruginosa is a phototropic bacterium. It grows readily in nutrient-rich, slowly moving water. Because its occurrence as a greenish deposit on the surface of ponds or lakes resembles an algal bloom, it is commonly referred to as “blue-green algae”. Such blue-green algal blooms have been reported for decades throughout the world and are not uncommon in Maryland waters.

Aside from being a nuisance and a danger to fish and wildlife, a bloom of Microcystis aeruginosa may be harmful to humans during recreational water use, either through body contact, inadvertent ingestion, or inhalation of water droplets. Nevertheless, reported instances of health effects from recreational water use are few and no fatalities have been reported.
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Lyme Disease in Calvert County Lyme disease is the most common tick-borne disease in Calvert County as well as in Maryland and the United States. Cases of Lyme disease are found throughout the county and are not concentrated in any particular area. > Learn More

Public Health Updates


Calvert County Beach Advisories
View the status of beaches in Calvert County, Maryland. The Health Department conducts routine water sampling and posting of public bathing beaches on a predetermined monitoring schedule from Memorial Day through Labor Day. > More Info


Vibrio in Waters Around the Chesapeake
Vibrio bacterial infections have occurred in the waters of the Chesapeake Bay and its tributaries. If not promptly treated, infections can lead to amputation or death. Vibrio is a bacteria that naturally live in the bay, rivers, and creeks that surround... > More Info

Opioid Abuse

Act Now Calvert
The Health Department has launched a public awareness campaign to educate Calvert residents about rising opioid & opiate abuse in the county. Prescription painkiller misuse & abuse is on the rise and could lead to addiction, or death. > More Info


Rabies Prevention
Rabies is a deadly disease that can be transmitted from an animal infected with rabies to unvaccinated pets and to people.  If untreated, rabies is almost always fatal.  Rabies is known to exist in all counties in Maryland. ... > More Info


  • September 10, 2015
    Free 2015 School Vaccine Clinic
    9:00 am – 3:00 pm (appt. only)
    K, 1, 7, & 8 Graders
    Health Department, PF
    > More Info
  • September 12, 2015
    RecoveryFest 2015
    10:00 am – 1:00 pm
    Serenity Farm Benedict, MD
    National Recovery Month
    More Info> 410-535-3079 x36
  • October 3, 2015
    Free Rabies Clinic
    10:00 am – 12:00 pm
    Northern High School
    Please Vaccinate all Pets!
    > More Info

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    Monday – Friday (excluding     holidays) 8:00 am – 5:00 pm.     Community Health clinics end
    at 4:30 pm. In case of inclement     weather, please call

    For After Hours Public Health     Emergencies Contact the Control     Center at: 410-535-3491 facebook
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975 Solomons Island Road North, PO Box 980, Prince Frederick, MD 20678 | (410) 535-5400 | Fax: (410) 535-5285
Crisis Hotline (410) 535-1121 • (301) 855-1075
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