Water quality at Kaʻanapali Beach
📍 Kaʻanapali, West Maui · near Black Rock
The Marriott Maui Ocean Club sits on Kaʻanapali Beach, West Maui's premier resort beach. Kaʻanapali has moderate-low bacteria risk — better than many Oahu beaches but not quite as clean as South Maui's Wailea strip. West Maui receives more rainfall than the drier south shore and has some streams that can affect water quality after rain.
The Kaʻanapali Beach stretch, including the Marriott's frontage, generally tests clean during normal weather. The DOH monitors the area regularly. The water is typically clear with good visibility for snorkeling at nearby Black Rock.
Based on: DOH Kaʻanapali Beach monitoring, West Maui stream inputs, seasonal rainfall patterns
Stay out for at least 72 hours after heavy rain. West Maui streams and occasional flash flooding can temporarily elevate bacteria in the Kaʻanapali area.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health, Marriott International, or any government agency or hotel brand. Ratings are estimates. Not real-time measurements.
Always verify with the Hawaii DOH Clean Water Branch.
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. 🤙