Water quality at Near Fort DeRussy
The Courtyard by Marriott Waikiki Beach is near Fort DeRussy, on the western side of Waikiki. Fort DeRussy Beach is one of the wider, less crowded sections of Waikiki with slightly better water quality positioning relative to the Ala Wai Canal. The western end of Waikiki tends to clear faster after rain due to prevailing current patterns. However, significant storm events affect the entire shoreline.
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.
If the ocean near Courtyard by Marriott Waikiki turns brown or murky after rain, do not enter the water. Brown water carries bacteria, pollutants, and sediment from runoff. Wait at least 72 hours after the rain stops and until the water visually clears before swimming. Consider these alternatives in the meantime:
Top-rated experiences near Courtyard by Marriott Waikiki.
Tours listed via Viator and GetYourGuide. Safe to Swim Hawaii may earn a commission if you book, at no extra cost to you.
900+ beaches and hotels across all islands
Free alerts when advisories change at your beach.
⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — it is not affiliated with the Hawaii Department of Health, Courtyard by Marriott Waikiki, 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.
This site is a work in progress and we want to make it better. If you notice something that isn’t working right, have a suggestion, or want to share local knowledge about a beach, please reach out.
When in doubt, don’t go out. 🤙