Maui's two major resort areas compared on water quality
Beach: Wailea Beaches
Wailea hotels enjoy low bacteria risk (1/5) thanks to South Maui's arid climate. Only about 15 inches of rain per year, no major streams, and modern wastewater systems produce some of Hawaii's cleanest resort beach water.
Beach: Kaʻanapali Beach
Ka'anapali hotels have moderate bacteria risk (2/5). West Maui receives more rainfall, and nearby streams (Honokowai, Wahikuli) carry runoff to the coast. Black Rock provides excellent snorkeling. The 2023 Lahaina fire raised concerns, though conditions have largely recovered.
Wailea wins decisively on water quality. South Maui's dry climate produces dramatically less runoff than West Maui. Wailea has no major streams feeding into the ocean, no cesspool issues in the resort area, and modern wastewater infrastructure. Ka'anapali on West Maui has nearby stream outlets, receives roughly twice the annual rainfall, and the 2023 fire added concerns about watershed contamination. For consistently clean swimming, Wailea is the clear choice on Maui.
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.
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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. 🤙