Water quality, bacteria risk, DOH advisories, and snorkeling conditions at Maui's most famous resort beach.
📍 West Maui, Kaʻanapali Resort Area
Kaʻanapali Beach is a 3-mile stretch of leeward West Maui coastline fronting some of Maui's most famous resort hotels. The leeward position provides good ocean flushing and generally low bacteria readings under dry weather conditions. The beach is regularly monitored by DOH and typically tests well when conditions are normal.
Water quality risk increases at the northern end (near Kaʻanapali Beach Hotel and Hanakaʻō Beach Park) after heavy rain, where stream drainage from the West Maui Mountains can affect conditions. The southern stretch near the Hyatt Regency is typically the most consistent for water quality.
Based on: DOH monitoring data, leeward location, open ocean flushing, West Maui Mountain drainage potential
Black Rock (Puʻu Kekaʻa) at the northern end of Kaʻanapali fronting the Sheraton Maui is Maui's most accessible reef snorkel site. The lava rock headland creates excellent coral habitat with diverse fish populations, green sea turtles, and occasional spinner dolphins offshore. Water clarity on calm mornings is excellent.
Enter the water from the small sandy beach on the south side of Black Rock. Snorkel around the point at comfortable depth. Watch for strong currents around the tip on high-swell days. Morning is best — trade winds create afternoon chop that reduces visibility.
Sunset cliff diving: The Sheraton Maui hosts a traditional cliff diving ceremony at Black Rock each evening at sunset. This is a complimentary viewable event for the public on the beach.
Farthest from stream drainage; most consistent DOH results; calm morning conditions.
Generally good conditions; moderate distance from drainage sources.
Good clarity for snorkeling; can be affected by north end drainage after rain.
Nearest to stream and drainage sources; most likely to receive advisories after heavy rain.
The DOH recommends staying out of the ocean for at least 72 hours after heavy rain. West Maui Mountain storms can affect Kaʻanapali quickly — watch for brown water near stream outlets as a clear warning sign.
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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 testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions. “No DOH Alerts” means no advisory is posted — not that the water was tested and found acceptable.
Always verify current water quality with the Hawaii Department of Health Clean Water Branch before entering the water.
When in doubt, don't go out.