Mauna Kea Observatory, Big Island — 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 Mauna Kea Observatory, Big Island:
Top-rated experiences near Mauna Kea Observatory, Big Island. Check water quality above, then plan your trip.
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Free alerts when water quality changes on Big Island — 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. 🤙