Diamond Head Crater, Oʻahu — ranked by water quality and bacteria risk
After heavy rain, bacteria levels spike at beaches near streams and river mouths. If a brown water advisory is active near Diamond Head Crater, Oʻahu:
Top-rated experiences near Diamond Head Crater, Oʻahu. Check water quality above, then plan your trip.
Tours listed via Viator and GetYourGuide. Safe to Swim Hawaii may earn a commission if you book, at no extra cost to you.
Free alerts when water quality changes on Oʻahu — brown water advisories and bacteria warnings.
⚠️ 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. 🤙