Water quality status and bacteria risk rating
📍 Windward Oʻahu, near Waimanalo. About 35 min from Waikiki.
Bellows Field Beach Park has generally clean water quality. This military beach is open to the public on weekends and features a long sandy beach with good ocean circulation on the Windward side of Oʻahu.
Waimanalo Stream nearby can carry runoff after heavy rain, which temporarily raises bacteria risk. During dry weather, water quality is consistently good. The beach is popular with families for its gentle waves and soft sand. Avoid swimming for at least 72 hours after significant rainfall.
Based on: DOH beach monitoring, Waimanalo Stream proximity, ocean circulation patterns
After heavy rain, the Department of Health recommends staying out of the ocean for at least 72 hours. Bellows Beach can be affected by runoff from Waimanalo Stream after storms. The stream carries agricultural and residential runoff that can elevate bacteria levels in the nearshore water. Wait for dry weather and clear water before swimming.
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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 or any government agency. 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. DOH only monitors a fraction of Hawaii’s beaches, and some areas have no regular testing at all.
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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