Water quality status and bacteria risk rating
📍 Hamakua Coast, Big Island — Black sand beach
Waipiʻo Valley Beach has moderate-low bacteria risk overall, though the river mouth area has higher concern. The Waipiʻo River flows through the valley and agricultural land before reaching the ocean, which can carry elevated bacteria levels especially after rain.
The primary danger at Waipiʻo Valley Beach is dangerous ocean currents, not bacteria. Strong rip currents, powerful shore break, and a steep beach drop-off make swimming extremely hazardous. There are no lifeguards. The dramatic black sand beach is best enjoyed from shore. The steep 4WD access road is itself a significant hazard.
Based on: River mouth bacteria input, agricultural runoff, remote location, open ocean exposure, no DOH regular monitoring
The Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. The Hamakua Coast receives significant rainfall, and the Waipiʻo River can carry substantial runoff. Avoid the river mouth area entirely after rain. Always check the water visually before entering.
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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.
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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