Natural Disaster Risk in Johns Island

Natural Hazard Profile: Johns Island, South Carolina

Johns Island is a city of approximately 27,576 residents in Charleston County, near the Atlantic Coast of the southeastern United States. The area experiences hot, humid summers and mild winters, with an active hurricane season with direct storm threat to the coastline shaping the pattern of natural hazards that residents encounter. Understanding the local risk profile is essential for anyone living in, moving to, or owning property in Johns Island.

FEMA rates Johns Island's composite natural disaster risk at 7.7 out of 10 — high risk. The risk of coastal inundation tops the local hazard profile, with the area exposed to storm surge, tidal flooding, and wave action during major coastal storm events. Residents should also account for hurricane and earthquake risk in their preparedness planning.

Johns Island's risk score, slightly above the 6.6/10 state average and well above the U.S. national average of 4.5/10. Of the 18 hazard categories tracked by FEMA for Charleston County, the highest-scoring are coastal flood, hurricane, and earthquake. These scores reflect county-level data and represent the baseline risk that all communities in the county share.

With a high natural disaster risk rating, Johns Island residents benefit from taking preparedness seriously. Reviewing insurance coverage for coastal flood and secondary hazards, registering for emergency alerts, and maintaining a household emergency kit are practical steps that can significantly reduce impact during a major event.