Water quality at Kaʻanapali Beach
The Westin Maui sits on Kaʻanapali Beach, one of Maui’s most famous resort beaches. The main water quality concern is Hanakaʻōʻō Stream, which empties at the south end of Kaʻanapali near Hanakaʻōʻō Beach Park and carries runoff from agricultural and residential areas.
The Westin is in the central section of Kaʻanapali, between Black Rock (north) and the stream outlet (south). On dry days, the water is usually fine and the beach is excellent for swimming and snorkeling. After rain, bacteria levels can spike across the entire shoreline.
Kaʻanapali rates slightly higher risk (3/5) than Wailea (2/5) due to the stream runoff. If water quality is your top priority, Wailea has a slight edge.
Based on: Hanakaʻōʻō Stream proximity, DOH monitoring data, Kaʻanapali compliance rates
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.
When conditions are clear, Kaʻanapali has world-class ocean activities. Check the water quality above, then book with confidence.
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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, The Westin Maui, Marriott, 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.
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.