Two family resorts on opposite sides of Oʻahu
Beach: Ko Olina Lagoons
Aulani fronts Ko Olina's man-made lagoons with calm, protected water. The enclosed lagoons have moderate bacteria risk — after heavy rain, stormwater runoff can affect water quality. On dry days, conditions are excellent for families.
Beach: Turtle Bay Beach / Kuilima Cove
Turtle Bay offers a natural beach setting on the North Shore with moderate bacteria risk. The beach is influenced by nearby streams and agricultural runoff. Winter brings large swells that make swimming more challenging.
Both resorts carry moderate water quality risk (2/5), but Aulani's Ko Olina lagoons provide more consistent swimming conditions. The man-made lagoons are calm and protected year-round, making them ideal for young children. Turtle Bay's beach is a natural North Shore setting with stronger currents, seasonal surf, and nearby stream runoff. For families prioritizing safe, calm swimming, Aulani's lagoons are the better choice. For adventure seekers who want a real North Shore experience, Turtle Bay delivers.
Water quality risk ratings are based on publicly available data from the Hawaii Department of Health Clean Water Branch, EPA impaired waters database, USGS stream monitoring data, and geographic analysis of pollution sources (streams, cesspools, storm drains). Ratings are estimates and may change with conditions.
Top-rated experiences near these hotels. Check water quality above, then plan your trip.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent project not affiliated with any hotel, resort, or the Hawaii DOH. Water quality ratings are estimates based on publicly available data — not real-time measurements.
Always verify conditions with the Hawaii DOH Clean Water Branch before swimming.
When in doubt, don't go out. 🤙