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 — 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.
On sunny days with no recent rain, conditions can be quite good. The beach is open-ocean facing, which helps with some natural flushing. After rain, wait 72 hours before swimming and look for any DOH advisories before entering the water.
Based on: Waianae cesspool density, storm drain locations, historical DOH advisory frequency
Stay out of the ocean for at least 72 hours after heavy rain anywhere on the Waianae Coast. 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.
When in doubt, don't go out. 🤙