Jefferson County also assists the State Department of Health in monitoring the safety of shellfish. Recent closures are posted in our news section. Signs are also posted at public beaches.
Harmful algae blooms (sometimes referred to as "red tides") can produce dangerous toxins. Seven cases of paralytic shellfish poisoning occurred in Jefferson County in September 2012 when a party harvested and ate mussels in a closed area. This poisoning resulted in hospitalization for several members of the group. In July 2012, Jefferson County experienced its first-ever closure for Diarrhetic Shellfish Poison (DSP).