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OAHU · KO OLINA

Aulani, A Disney Resort & Spa

Beach water quality and lagoon safety guide

📍 Ko Olina, West Oʻahu — 92-1185 Aliʻinui Dr

Checking live advisories…
If It Looks Brown, Don't Swim
Even in Ko Olina's lagoons, brown or murky water after heavy rain is a sign of runoff. Wait at least 72 hours after major storms before swimming. Always check the water visually, even at resort beaches.
Learn more about brown water advisories →
Historical Bacteria Risk
⚠ Historical rating — based on long-term data, not current conditions. Always verify with DOH and check the water yourself.
Very Low Risk 1 / 5

Ko Olina's man-made lagoons, including the lagoon fronting Aulani Resort, have consistently excellent water quality. The engineered lagoons maintain ocean connection while protecting against swell and limiting stormwater intrusion. DOH monitoring data for Ko Olina lagoons historically shows very low bacteria counts.

The primary swimming areas at Aulani are the resort's own chlorinated pools — not the lagoon — so most guests are in water that is tested and treated daily. The lagoon beach is ideal for wading, boogie boarding, and calm ocean swimming.

Based on: Ko Olina lagoon DOH monitoring data, engineered lagoon design, limited development runoff

⚠️ The 72-Hour Rain Rule

Even Ko Olina's lagoons can see elevated bacteria after heavy rain. Stormwater from West Oʻahu can reach the lagoons via runoff. The DOH recommends waiting at least 72 hours after heavy rain before swimming in ocean waters anywhere in Hawaiʻi.

Ko Olina Lagoon — What to Expect at Aulani

Aulani fronts Ko Olina Lagoon 4, one of four crescent-shaped man-made lagoons at Ko Olina Resort. The lagoon offers calm, protected swimming in clear water typically 3–5 feet deep at the center. Sand bottom is soft and gently sloping — perfect for families with young children.

Beyond the lagoon, Aulani features the Waikolohe Valley pool complex with a lazy river, waterslides, a dedicated kiddie area, and a snorkeling pool stocked with tropical fish. All resort pool water is chlorinated and tested regularly.

Book Tours & Activities

Top-rated experiences near this beach. Check water quality above, then plan your trip.

Ko Olina Snorkeling Tours
Guided snorkeling just outside the lagoons
Viator
Dolphin Watching West Oahu
Spinner dolphins near Ko Olina coast
Viator
Ko Olina Luau
Traditional Hawaiian feast near Aulani
Viator
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⚠️ Important Disclaimer

Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health or any government agency. Water quality ratings are estimates based on publicly available data and are not real-time measurements.

Always verify current conditions with the Hawaii Department of Health Clean Water Branch before swimming.

This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this site you accept full responsibility for your own safety. See our Terms of Use for full details.

When in doubt, don't go out. 🤙

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