Water Quality by Campsite
Malaekahana Beach on Oahu, Polihale on Kauai, and Spencer Beach on the Big Island have good water quality. Bellows Beach on Oahu (military, weekends) also has low bacteria risk.
It depends on the campsite. Some, like Bellows and Spencer, have consistently good water quality. Others near streams or urban areas may have higher bacteria risk. Always apply the 72-hour rain rule and check current advisories.
Most beach campgrounds require advance permits from the county or state parks system. Permits often sell out weeks in advance for popular sites. Check the specific county or state parks website for availability and booking.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain, even if the water looks clear. Bacteria and pollutants from runoff can linger in the water longer than the brown color does.
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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, any entity mentioned on this page, or any government agency or hotel brand. 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 safe. DOH only monitors a fraction of Hawaii’s beaches, and some areas have no regular testing at all.
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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When in doubt, don’t go out. 🤙