Water quality status and bacteria risk rating — Can you swim today?
📍 East Molokaʻi, 28 miles from Kaunakakai
Halawa Bay is a stunning river-mouth beach at Molokaʻi’s east end, where two streams drain a wet windward valley directly into the ocean. On clear, dry days locals do swim here, but bacteria risk is elevated after any rain. DOH does NOT test Molokaʻi beaches — there is no live advisory for this location.
Based on geographic analysis, Halawa Bay likely has moderate bacteria levels overall, with sharp spikes after rain. The main drivers are:
In dry conditions with clear water, locals do swim here and the bay is popular for family picnics and valley-hike rest stops. The risk is not constant — it tracks rainfall closely.
However: This is an estimate only. The Hawaii Department of Health does NOT monitor any Molokaʻi beaches. There is no testing data to confirm actual bacteria levels. “No DOH Alerts” means no data exists — not that it was tested clean. Always use visual inspection before entering the water.
Based on: Geographic analysis only (no DOH data). River-mouth bay, windward wet valley, two perennial streams, high rainfall zone.
The Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. For river-mouth beaches like Halawa, we recommend longer wait times: 72 hours after light rain, 4–7 days after moderate rain, and wait until the water returns to clear blue-green after a Kona low or storm. Since DOH does not monitor any Molokaʻi beaches, there is no testing data to confirm when the bay actually clears. See our Swimming After Rain in Hawaii guide for the full 4-tier recovery table.
*Estimated — DOH does not monitor Molokaʻi beaches. No lodging exists in Halawa Valley itself.
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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 clean. DOH only monitors a fraction of Hawaii’s beaches, and some areas have no regular testing at all.
Molokaʻi beaches are NOT monitored by DOH. The ratings on this page are geographic estimates only. River-mouth beaches like Halawa Bay carry elevated bacteria risk after any rain, and no testing data exists to confirm when they clear. Always verify conditions visually before entering the water. Check with the Hawaii Department of Health Clean Water Branch for the latest information.
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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This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this site you accept full responsibility for your own safety. See our Terms of Use for full details.
When in doubt, don't go out. 🤘