What swimmers need to know about ear infections, bacteria, and staying healthy in Hawaiʻi's ocean water.
This guide is for general informational purposes only and is not a substitute for professional medical advice. If you suspect you have an infection from swimming, see a doctor or visit an urgent care clinic. Hawaiʻi has excellent medical facilities on all major islands.
Swimmer's ear (otitis externa) is an infection of the outer ear canal, typically caused by water that remains trapped in the ear after swimming. The warm, moist environment becomes a breeding ground for bacteria. In Hawaiʻi, where ocean water may contain elevated bacteria levels from runoff, cesspools, or sewage, the risk can be higher than in chlorinated pools.
The infection is especially common among visitors who swim frequently during their trip and don't adequately dry their ears between sessions.
Staphylococcus bacteria, including antibiotic-resistant MRSA, can be present in ocean water especially near areas with sewage or cesspool contamination. The bacteria can enter through cuts, scrapes, or abrasions. Always cover open wounds before swimming and clean them thoroughly afterward.
Swallowing contaminated ocean water can cause nausea, vomiting, diarrhea, and stomach cramps. The risk is highest after rain at beaches with elevated Enterococcus bacteria levels. Children are particularly vulnerable because they tend to swallow more water.
Rashes and skin infections can develop from exposure to contaminated water or marine organisms. This includes seabather's eruption (caused by tiny larvae), coral scrapes that become infected, and bacterial skin infections from contaminated water entering broken skin.
The risk of infection is directly tied to bacteria levels in the water. Hawaiʻi's Department of Health monitors beaches for Enterococcus and Clostridium perfringens — indicator bacteria that suggest the presence of sewage or fecal contamination. When these levels exceed safe thresholds, the risk of ear infections, GI illness, and skin infections increases significantly.
Bacteria levels spike after heavy rain due to stormwater runoff, cesspool overflow, and sewer system overflows. This is why the 72-hour rain rule is so important.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — it is not affiliated with the Hawaii Department of Health or any government agency. This page provides general health information and is not medical advice. If you suspect an infection, consult a healthcare professional.
Always verify current water quality conditions with the Hawaii Department of Health Clean Water Branch before entering the water.
When in doubt, don't go out. 🤙