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Swimming Hazards in Hawaii

Information about potential hazards and dangerous conditions to watch out for when you are swimming in Hawaii.

Hawaii Contaminated Swimming Area Warnings
The beaches and rivers of Hawaii can become contaminated after heavy rains. This Web site published by the Hawaii State Department of Health includes reports warnings about beaches, lakes, rivers, canals, and streams are not safe for swimming because of contamination from bacteria, untreated sewage, or industrial waste. Select an island from the map on this page to see contamination warnings.

Oahu Box Jellyfish Warnings
Box Jellyfish normally arrive in the near the shore on the island of Oahu 7 to 11 days after the full moon, The 808JellyFish.com Web site features a month-by-month Oahu Box Jellyfish Warning Calendar.

Ocean Swimming Safety Tips
A list of safety tips for people who swim in the ocean, anywhere in the world.

Box Jellyfish in Hawaii
Hawaii's box jellyfish are unique among the world's jellyfish because their arrival on shore is very predictable. They come near shore to spawn for a few days, one or two weeks after each full moon.

Sharks in Hawaii
Facts about sharks in Hawaii, how to avoid an encounter with a Hawaiian shark, and statistics about human/shark encounters in Hawaii.

Venomous Creatures in Hawaiian Waters
Descriptions of venomous or biting fish, snakes, plants, and other dangerous organisms typically or occasionally found in Hawaiian waters. From the Hawaiian Lifeguard Association.

Ocean Safety Beach Warning Signs
Signs used by the Hawaii Lifeguard Association to warn beach swimmers of hazards and safety issues.
  • Dangerous Shore Break
  • High Surf
  • Jellyfish
  • Man-O-War
  • No Diving
  • No Swimming
  • Rip Currents

  • Shark Sighted
  • Sharp Coral
  • Slippery Rocks
  • Strong Current
  • Sudden Drop Off
  • Waves Break on Ledge


  • See also:
  • More About Swimming in Hawaii
  • Water Activities in Hawaii



  • Related Links
    Activities in Hawaii - Main Menu
    Islands of Hawaii
    Hawaii for Visitors



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