Understand most sea foam
Most sea foam is not harmful and often indicates a productive ocean ecosystem.
Sea foam
Sea foam at Surfside Beach
Sea foam (also called seafoam) forms when wind and waves churn dissolved organic matter in seawater.
Sources checked September 20, 2026: NOAA Ocean Service sea foam facts (opens in a new tab).
Three choices
Know the Gulf coast bloom example
A red tide is a common term for a harmful algal bloom. Along Gulf coast beaches, popping foam bubbles during a decaying Karenia brevis bloom can send algal toxins into the air. The aerosol can irritate eyes and poses a health risk for people with asthma or other respiratory conditions.
Check beach monitoring status
Use the SCDES beach monitoring page to check beach monitoring advisories.
What this page covers
This page gives South Carolina coastal guidance and identifies the Gulf coast Karenia brevis bloom as the cited aerosol example.
This page does not report live Surfside Beach foam sightings, blooms, or swim advisories. The cited sources do not establish a local foam frequency or season. A regional explanation cannot identify the cause of a particular patch of foam.
Source: NOAA Ocean Service sea foam facts (opens in a new tab) · Source: NOAA Ocean Service red tide facts (opens in a new tab) · Source: South Carolina Department of Environmental Services beach monitoring (opens in a new tab) · Source: SCDES South Carolina tidal saltwater handbook, page 32 (opens in a new tab) · Source: SCDES harmful algal bloom watches and advisories (opens in a new tab)
Sea foam questions
- What causes foam on the beach in South Carolina?
- The SCDES South Carolina tidal saltwater handbook describes surface foam as common and sometimes natural. Vegetation can release surfactants, substances that help surface foam form. Unusually colored foam with a fragrant smell may come from household detergents. This coastal guidance does not identify the cause of a particular patch at Surfside Beach.
- Source: SCDES South Carolina tidal saltwater handbook, page 32 (opens in a new tab)
- What does beach monitoring tell us at Surfside Beach?
- SCDES tests beach water for enterococcus bacteria. Long-term swim advisories started in Surfside Beach in 2008. SCDES issues temporary swim advisories during its May 1 to October 1 monitoring season. That schedule is not a sea foam season or a forecast of foam.
- Source: South Carolina Department of Environmental Services beach monitoring (opens in a new tab)
- What is sea foam?
- Sea foam forms when wind and waves churn dissolved organic matter in seawater.
- Source: NOAA Ocean Service sea foam facts (opens in a new tab)
- Is sea foam pollution?
- Most sea foam is natural and not harmful. It often indicates a productive ocean ecosystem.
- Source: NOAA Ocean Service sea foam facts (opens in a new tab)
- When can sea foam be a concern?
- Along Gulf coast beaches, foam can be a concern during a decaying Karenia brevis harmful algal bloom. Popping bubbles can send algal toxins into the air.
- Sources: NOAA Ocean Service sea foam facts (opens in a new tab), NOAA Ocean Service red tide facts (opens in a new tab)
- How can a visitor check current beach water status?
- SCDES reports current beach water status on its beach monitoring page, including active short-term swim advisories. For Surfside Beach, check that page and its Beach Access Guide for short-term and long-term swim advisories. Check the separate SCDES harmful algal bloom page for bloom watches and advisories. An empty short-term swim advisory table does not rule out a long-term advisory.
- Sources: South Carolina Department of Environmental Services beach monitoring (opens in a new tab), SCDES harmful algal bloom watches and advisories (opens in a new tab)