Water quality, conditions, and what to know before you go
Waimea Bay is legendary for big wave surfing with winter waves regularly exceeding 30-foot faces. The Eddie Aikau big wave competition is held here. Summer brings completely flat, calm conditions. Expert-only in winter.
Extremely powerful shore break during winter swells. The bay's shape concentrates wave energy. Summer shore break is minimal and the bay becomes a calm swimming lagoon.
Waimea River discharges directly into the bay, carrying bacteria and sediment after rain. Surfing during or after rain events exposes surfers to elevated bacteria from upland agriculture and residential areas.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. This applies to all ocean activities including surfing. Runoff carries bacteria from land into nearshore waters.
When conditions are clear, Waimea Bay has great options for surfing. Check the water quality above, then book with confidence.
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Safe to Swim Hawaii provides water quality information based on publicly available DOH data and seasonal patterns. This is not medical or safety advice. Always check current conditions, obey posted signs, and use your own judgment before entering the ocean. Privacy Policy
⚠️ 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.
Always verify current water quality conditions with the Hawaii DOH Clean Water Branch before entering the water.
When in doubt, don't go out. 🤙