Is there a brown water advisory in Waikiki right now?

Check the live status at the top of this page for current Waikiki brown water advisories. Advisories are most common after heavy rain, when the Ala Wai Canal overflows and storm drains discharge directly into the nearshore waters along Waikiki Beach. The west end of Waikiki near the Hilton Hawaiian Village is typically affected first due to its proximity to the Ala Wai Canal outlet.

Why does Waikiki get brown water advisories?

Waikiki's brown water comes primarily from the Ala Wai Canal, which collects urban runoff from a 19-square-mile watershed including Manoa, Palolo, and Makiki valleys. During heavy rain, this canal overflows, sending sediment, bacteria from an estimated 88,000 cesspools statewide, and urban pollutants into nearshore waters. A 2026 study in Nature Scientific Reports found that 100% of Waikiki's storm drainage outfalls will fail by 2050 due to sea level rise.

Where should I swim instead of Waikiki during a brown water advisory?

During a Waikiki brown water advisory, consider beaches farther from stream and canal outlets. Ko Olina Lagoons on Oahu's west side are man-made and less affected by runoff. Lanikai Beach on the windward side has minimal stream exposure. However, major rain events can affect the entire island. Always check live advisory status for any beach before swimming.

What is the Ala Wai Canal and why does it affect Waikiki?

The Ala Wai Canal is a 1.5-mile drainage canal built in the 1920s to drain the wetlands where Waikiki now sits. It collects runoff from Manoa, Palolo, and Makiki valleys, a 19-square-mile watershed. During heavy rain, the canal overflows into the ocean at the west end of Waikiki. The canal has been identified as one of the most polluted waterways in Hawaii, carrying bacteria from cesspools, pet waste, urban runoff, and agricultural chemicals.

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LIVE STATUS · WAIKIKI

Waikiki Brown Water Advisory

Q: Which part of Waikiki is most affected by brown water?

The west end of Waikiki (near Hilton Hawaiian Village and Fort DeRussy) is most affected because it sits directly adjacent to the Ala Wai Canal outlet. Currents typically carry contaminated water eastward along the shore. The east end near Diamond Head is generally less affected, though during major storm events the entire Waikiki coastline can be impacted.

Q: How long does brown water last in Waikiki?

Brown water in Waikiki typically lasts 2 to 4 days after heavy rain stops. The Ala Wai Canal can continue discharging for 24-48 hours after rain ends. The 72-hour rule applies: wait at least 72 hours after rain stops and the water looks clear before swimming. The brown color clears before bacteria does, so clear water does not necessarily mean bacteria-free water.

Q: Is it safe to swim in Waikiki after rain?

The DOH recommends waiting at least 72 hours after rain stops before swimming at any beach. After rain, Waikiki receives runoff from the Ala Wai Canal, storm drains, and urban surfaces. Bacteria levels can spike 500% above the EPA recreational swimming threshold (130 CFU/100mL enterococcus) within hours of a rain event. We defer to DOH advisories rather than assert swim conditions for any specific beach. Always check the latest DOH advisories and use your own judgment.

A Hawaii Department of Health warning that Waikiki ocean water may be contaminated by Ala Wai Canal discharge and storm runoff. DOH advises staying out 48–72 hours after rain stops. The west end near Hilton Hawaiian Village is affected first; the east end near Diamond Head recovers soonest.

Live status · Ala Wai Canal outflow · 72-hour rule · zone-by-zone recovery

Checking for active Waikiki advisories…

Waikiki brown water advisory = stay out of the ocean. Rain flushes the Ala Wai Canal — one of Hawaii’s most polluted waterways — directly into Waikiki’s nearshore waters, spiking bacteria up to 500% above the EPA recreational swimming threshold (130 CFU/100mL enterococcus).

⚠ The rule: Wait at least 72 hours after rain stops — even if the water looks clear and no advisory is posted. Clear water ≠ bacteria-free water.

The west end of Waikiki near Hilton Hawaiian Village is hit first because the Ala Wai Canal empties there. The east end near Diamond Head is affected later and recovers sooner.

The Ala Wai Canal — Waikiki’s Contamination Source

The Ala Wai Canal is the #1 reason Waikiki gets brown water advisories. Built in the 1920s to drain the wetlands where Waikiki now sits, this 1.5-mile canal collects urban runoff from a 19-square-mile watershed including Mānoa Valley, Pālolo Valley, and Makiki.

During heavy rain, the canal overflows at its outlet near the Hilton Hawaiian Village, sending a plume of sediment, bacteria, and urban pollutants into the ocean. The contamination includes sewage from an estimated 88,000 cesspools statewide that leak during saturated soil conditions, pet waste, fertilizer runoff, and industrial chemicals.

A 2026 study published in Nature Scientific Reports found that 100% of Waikiki’s storm drainage outfalls will fail by 2050 due to sea level rise — meaning brown water events will become more frequent and severe in coming decades.

Read the full Ala Wai Canal contamination analysis →

Waikiki Brown Water Zones

Not all of Waikiki is affected equally. The Ala Wai Canal outlet is at the west end, and currents typically carry contaminated water eastward along the shore.

Zone 1: West Waikiki (Hilton to Fort DeRussy)

Directly adjacent to the Ala Wai Canal outlet. First to be contaminated, last to recover. Duke Kahanamoku Beach and Fort DeRussy Beach are highest risk. During heavy rain, visible brown plumes can be seen entering the water here within hours.

Zone 2: Central Waikiki (Royal Hawaiian to Sheraton)

Affected as currents carry contamination eastward. Typically 6–12 hours after the west end. The famous stretch in front of the Royal Hawaiian and Moana Surfrider is in this zone. Brown water may be less visible here but bacteria levels can still be elevated.

Zone 3: East Waikiki (Queen’s to Kaimana)

Farthest from the Ala Wai outlet. Queen’s Surf Beach and Sans Souci Beach (Kaimana) are typically the last affected and first to recover. During minor rain events, this zone may not be affected at all. Still follow the 72-hour rule.

Storm Drains Along the Beach

Multiple storm drain outlets run directly onto Waikiki Beach along its entire length. These can discharge contaminated water even during moderate rain events. Avoid swimming near any visible storm drain outlet, especially after rain.

How Long Does Brown Water Last in Waikiki?

Waikiki’s brown water duration depends on the severity of the rain event and which zone you are in:

24–48 hrs

Light rain (< 0.5 inches)

Storm drains discharge briefly. East Waikiki may not be affected. West end sees minor contamination near the Ala Wai outlet. Recovery is relatively fast with good ocean circulation.

48–72 hrs

Moderate rain (0.5–2 inches)

Ala Wai Canal overflows. All three Waikiki zones affected. Brown water visible along the west end. The canal continues discharging for 24–48 hours after rain stops. Follow the full 72-hour rule.

72+ hrs

Heavy rain or Kona Low storms (2+ inches)

Severe Ala Wai Canal overflow. Entire Waikiki coastline affected. Brown water can persist for 4–7 days. March 2026 Kona Low storms caused advisories lasting over a week on parts of Oʻahu. Consider Ko Olina Lagoons or Lanikai Beach as alternatives.

Where to Swim Instead of Waikiki During Brown Water

If Waikiki has an active brown water advisory, these Oʻahu beaches are less affected by urban runoff:

Ko Olina Lagoons · Man-made lagoons, minimal runoff

Low Risk

Lanikai Beach · No stream outlets, windward coast

Low Risk

Kailua Beach · Kawainui Marsh drainage, check status

Moderate

Hanauma Bay · Protected nature preserve, no streams

Low Risk

⚠ Important

During major storm events (Kona Low storms), all Oʻahu beaches can be affected. Always check live advisory status for any beach before swimming, even beaches with “Low Risk” ratings.

When Does Waikiki Get Brown Water?

Waikiki brown water advisories follow Oʻahu’s rainfall patterns:

Wet Season (November–March)

Highest risk. Winter storms and Kona Lows bring heavy rain to Mānoa and Pālolo valleys, overwhelming the Ala Wai Canal. Most brown water advisories are issued during these months. January and February are the wettest months for urban Honolulu.

Transition (April–May, October)

Moderate risk. Occasional heavy showers can trigger Ala Wai overflow, especially in April and October. Tropical disturbances can bring unexpected heavy rain. Stay aware of weather forecasts.

Dry Season (June–September)

Lowest risk. Trade winds bring dry conditions to the south shore. Brown water advisories are rare but not impossible — tropical storms or stalled fronts can bring heavy rain even in summer. Waikiki is at its best during these months.

Related Guides

Waikiki Beach Water Quality Today

Live Status →

Ala Wai Canal Contamination Analysis

Deep Dive →

Brown Water Advisory — All Islands

Live Status →

Swimming After Rain in Hawaii

72-Hour Guide →

Where to Swim During a Brown Water Advisory

All Islands →

Kona Low Storms — Beach Impact Guide

Recovery Times →

All Oʻahu Beaches & Hotels

Water Quality →

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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 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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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.