Water quality status and bacteria risk rating
📍 In Honolulu on Oʻahu's south shore, from the Hilton Hawaiian Village to Kapahulu
Usually, yes. Waikiki Beach water quality is tested weekly by the Hawaii Department of Health, and the live advisory status for today is shown directly below. The main risk is a brown water advisory triggered by heavy rain flushing the Ala Wai Canal — in those cases DOH recommends staying out of the water for at least 72 hours after the rain stops.
When conditions are clear, Waikiki has world-class ocean activities. Check the water quality above, then book with confidence.
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Two miles of white sand stretching from the Hilton Hawaiian Village to Kapahulu, Waikiki is Hawaii's most visited beach and the birthplace of modern surfing. Gentle waves make it popular for beginner surfing and stand-up paddleboarding. The beach faces south, so it's generally calm year-round with occasional larger swells in summer.
Waikiki Beach is a DOH Tier 1 monitored beach that generally passes weekly bacteria tests. However, the Ala Wai Canal runs along the back of Waikiki and empties into the ocean at the west end of the beach. After heavy rain, the canal carries stormwater, fertilizers, and sewage overflow into the nearshore waters.
The western end of Waikiki (near Hilton Hawaiian Village and Duke Kahanamoku Lagoon) is more affected than the eastern end near Diamond Head. The lagoon's limited circulation means bacteria can linger there longer.
Based on: DOH Tier 1 beach monitoring, geographic risk assessment
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. At Waikiki, this is especially important because the Ala Wai Canal drains a large urban watershed. Bacteria levels can be dangerously high before the state has time to test and post an advisory.
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Not all of Waikiki is the same. The beach runs about 2 miles from the Hilton end to Kaimana Beach, and water quality varies significantly depending on how close you are to the Ala Wai Canal outlet.
Closest to the Ala Wai Canal outlet. After rain, contaminated canal water hits this zone first. The Duke Kahanamoku Lagoon has limited circulation so bacteria can linger for days longer than the open beach. If you're staying at the Hilton Hawaiian Village, be extra cautious after any significant rainfall.
The heart of Waikiki — the busy stretch in front of the Royal Hawaiian and Sheraton. This is what most people picture when they think of Waikiki Beach. Better flushing than Zone 1, but still affected by canal runoff during significant rain events. Generally fine in dry weather.
The Diamond Head end of Waikiki, around Kuhio Beach Park. Farther from the canal outlet and generally sees faster water quality recovery after rain. This is where the DOH monitoring tends to show cleaner results. If you're choosing where to swim along Waikiki, go east.
Technically east of Waikiki proper, Sans Souci (also called Kaimana Beach) sits below the New Otani Kaimana Beach Hotel near the Natatorium. No Ala Wai influence here. The water is generally the cleanest in the greater Waikiki area and it's less crowded than the main strip. Local favorite — most tourists don't know it exists.
In the 1920s, Waikiki was mostly wetlands and taro fields. Engineers dredged the Ala Wai Canal to drain them and make way for the hotels and development that turned Waikiki into what it is today. That decision has had consequences for water quality ever since.
The canal acts as the drain for one of Honolulu's largest urban watersheds — collecting stormwater runoff from Manoa Valley, McCully, and Palolo before emptying into the ocean at the west end of Waikiki Beach. When it rains hard, everything from streets, parking lots, and yards in those neighborhoods flows through the canal and straight into the water where people are swimming.
The city has been trying to improve the canal for decades. There are restoration projects underway and better diversion infrastructure has been added. But the fundamental problem — that millions of people's stormwater drains through a century-old channel into a world-famous swimming beach — hasn't been solved. The 72-hour rule after rain isn't just a guideline at Waikiki. It's genuinely necessary.
Hawaii's rainfall follows a seasonal pattern that directly affects Waikiki water quality. Here's what to expect month by month.
Based on Honolulu seasonal rainfall averages and DOH advisory history. Individual years vary.
If Waikiki's water looks brown or an advisory is posted, Oʻahu has better options within 45 minutes. These beaches have no Ala Wai Canal influence.
⚠️ 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 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.
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. 🤙