Water quality status and bacteria risk rating
📍 Waianae Coast, West Oʻahu
Māʻili Beach Park is a long, sandy community beach on Oʻahu's Waianae Coast. The beach itself is beautiful ā wide, white sand, and calm during summer months when protected from north swells. However, cesspool density in the surrounding community creates elevated bacteria risk compared to beaches on other coasts.
Open-ocean exposure and dry weather do not establish current water quality. Avoid swimming during or immediately after heavy rain and stay out of brown or murky water. Follow any DOH advisory affecting the Māʻili or Waiʻanae Coast area until DOH lifts it.
Based on: Waianae cesspool density, storm drain locations, historical DOH advisory frequency
Avoid swimming during or immediately after heavy rain and stay out of brown or murky water. Elapsed time and clear-looking water do not establish water quality. Follow any DOH advisory affecting this beach until DOH lifts it. Check DOH beach monitoring guidance. Cesspool-area runoff can significantly raise E. coli and enterococcus levels after storms.
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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. Ratings are estimates based on publicly available data and are not real-time measurements.
Always verify with the Hawaii DOH Clean Water Branch before entering the water.
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. 🤙