By Water Quality
Kohala Coast resorts on the Big Island (Mauna Kea, Hapuna Beach, Mauna Lani, Fairmont Orchid) have consistently the lowest bacteria risk. On Maui, Kapalua resorts rank highest. On Oahu, the Four Seasons Ko Olina area is cleanest.
Rankings are based on long-term DOH bacteria testing data, proximity to stream outlets and runoff sources, ocean circulation patterns, and geographic position. The dry leeward coasts consistently outperform wetter windward areas.
Not always, but there is a correlation. Many luxury resorts were built on prime dry-coast locations with naturally good water quality. Budget hotels in urban areas like Waikiki or Kahului tend to be near areas with more runoff.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain, even if the water looks clear. Bacteria and pollutants from runoff can linger in the water longer than the brown color does.
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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, any entity mentioned on this page, or any government agency or hotel brand. Water quality ratings on this site are estimates based on publicly available testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions. “No DOH Alerts” means no advisory is currently posted — it does not mean the water was tested and found safe. DOH only monitors a fraction of Hawaii’s beaches, and some areas have no regular testing at all.
Always verify current water quality conditions with the Hawaii Department of Health Clean Water Branch before entering the water. This site is for informational purposes only and should not be the sole basis for any swimming decisions.
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When in doubt, don’t go out. 🤙