If you’re dreaming of crystal-clear water and perfect beach days in Hawaii this spring, you may want to pause before diving in. Across multiple islands, recent storms have triggered widespread water-quality warnings, meaning some of Hawaii’s most beautiful beaches aren’t as safe as they look right now.
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Related: Torrential Rain in Hawaii Has Finally Stopped—but Is It Smart to Still Visit? Here’s What Travel Experts and Locals Say
In March 2026, heavy rains and storm systems led to multiple “brown water advisories” across Hawaii. These advisories have been issued on several islands, including Oʻahu, Maui, Kauaʻi, and the Big Island.
A brown water advisory means exactly what it sounds like: ocean water turns murky or brown due to runoff flowing from land into the sea. That runoff can carry sediment, sewage, bacteria, chemicals, and debris, making swimming potentially unsafe.
In some areas, conditions have been serious enough to close beaches entirely. For example, parts of the Big Island, including South Kohala and North Kona, have seen full beach park closures due to contamination concerns.
@hawaiirightnowI couldn't believe how brown the water was at Waikiki today 03/28/28. Nearly a week after those Kona lows slammed Oʻahu, we’re now seeing what’s left behind… and it’s not just debris. That brown water hitting our beaches? It’s carrying bacteria, pollution, and everything washed down from upstream… including human and animal waste. Doctors are already treating people for skin infections, cuts, and irritation, especially those helping with cleanup. Some are even saying their skin started burning after exposure. And it’s not just on land… Scientists are now looking at what this runoff could do to our reefs… because everything flowing into the ocean doesn’t just disappear, it affects the fish, the coral, and the entire ecosystem we depend on. Officials have been saying to stay out of the water for at least 72 hours after heavy rain… but a lot of locals are saying use your eyes. All I gotta say is “If it’s brown, turn around!” ? Would you jump in this water? Let us know in the comments below. ?? #HawaiiRightNow #HawaiiLife #Hawaii #BrownWater #Waikiki
♬ original sound - Hawaii Right NowWhy These Beaches Are Being Affected
The main culprit is heavy rain. When storms hit Hawaii, water rushes down mountains and through urban areas, collecting pollutants along the way. This runoff eventually drains into the ocean, especially near stream mouths and coastal outlets.
One major example is the Ala Wai Canal on Oʻahu, which channels runoff from Honolulu directly into the ocean near Waikiki, often causing spikes in bacteria levels after rainfall. Other contributing factors include aging wastewater systems and thousands of cesspools across the islands, which can leak into coastal waters during storms.
The result? Even beaches that typically look pristine can temporarily become unsafe.
Related: Hawaii Becomes the First Destination to Win the Sustainability Leadership Award
While advisories can change daily, several types of beaches are currently higher risk:
West Hawaii (Big Island): South Kohala and North Kona shorelines have seen closures and advisoriesKauaʻi: North and east shore areas like Hanalei, Kapaʻa, and Wailua have been impacted by runoffOʻahu: Areas near Waikiki and the Ala Wai Canal, plus parts of the North Shore after stormsMaui: Shorelines from Lahaina to Hookipa and other rain-affected areasIn general, any beach near a stream, harbor, or drainage outlet is more likely to experience contamination after heavy rain.
@jazhasclassThe brown water advisory for Oahu created a lot of questions so let’s talk about it. People tend to think that if the water is blue that it should be safe, but it technically doesn’t need to be “brown,” it could be low visibility (aka murky) and less clear. You might not even notice this if you aren’t used to the water here, and it looks different than what you are used to. So you can check brown water advisory on the DOH website or ask the lifeguards. The general rule is to stay out of the ocean for 48-72 hours after heavy rain, after the sun has been out. If the rain has been particularly bad, some locals will opt to wait a week. If you end up going out into the water, no judgement but know the risks. You are risking coming in contact with the contaminants that come from run off, sewage water, human and animal waste. You are also at higher risk for shark activity because they like to hunt in these conditions and may mistake you in lower visibility conditions. It’s all a risk when you get into the ocean, but calculated risks are best. Anything else you’d add? #brownwater #surf
♬ Could You Be Loved - Bob Marley & The WailersWhat Makes “Brown Water” Dangerous
The biggest concern isn’t just murky water, it’s what’s in it. Runoff can contain elevated levels of bacteria, such as enterococci, which come from human and animal waste and can cause illness.
Health officials warn that swimming in contaminated water can lead to infections, stomach illness, skin irritation, and more serious conditions, especially for children or those with weakened immune systems. Because these contaminants aren’t always visible, clear-looking water isn’t always safe immediately after storms.
It is recommended to stay out of the ocean for 48 to 72 hours after heavy rain, and longer if the water remains murky. Sunlight and calmer conditions help clear contamination over time, but it can vary depending on location and rainfall intensity.
What This Means for Travelers
If you’re visiting Hawaii right now, that doesn’t mean you should cancel your trip; it just means you should adjust your plans.
First, check local advisories daily. Conditions can change quickly, and some beaches may be perfectly safe while others nearby are not.Second, be flexible. If your planned beach is under an advisory, consider heading to drier regions, such as leeward (west-facing) coasts, which tend to have cleaner water due to lower rainfall. Third, don’t ignore warning signs. Lifeguards and posted advisories are there for a reason, and entering contaminated water isn’t worth the risk.Hawaii’s beaches are still some of the most beautiful in the world, but right now, some are best admired from the shore.
If you’re traveling this spring, stay informed, avoid murky water, and give the ocean time to recover after storms. Because in paradise, even the clearest waters can change quickly.
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