The Hawaiʻi State Department of Health put out a Brown Water Advisory for Waiʻalae Beach County Park on Oʻahu on March 12, 2026, after storms and runoff turned the nearshore waters a murky brown. The alert stretches across the Kahala–Waiʻalae shoreline, where stream mouths and tucked-away coves tend to hold on to muddy flows instead of flushing them out. Until water testing shows things have cleared up, beachgoers are being told to treat any obviously discolored water as a potential health risk.
The notice specifically flags Waiʻalae Stream, Waiʻalae Country Club, Waiʻalae Beach Park, Kahala Beach and Kahala Hilton Beach as areas of concern, according to the Hawaiʻi State Department of Health. Officials are warning people to stay out of brown or cloudy surf, especially right after heavy rain. County lifeguards and park staff may also post warning signs at beach entrances along the affected stretch.
What a brown water advisory means
A Brown Water Advisory is a heads-up that storm runoff can drag all kinds of unwelcome extras into the ocean, including sediment, sewage, pesticides and bacteria that can bump up the odds of gastrointestinal and other infections, according to Hawaii News Now. Local coverage and health officials consistently tell people to steer clear of obviously brown water and even recently exposed sand after a big rain. Young children, older adults and anyone with a weakened immune system are considered most at risk.
How long the advisory may last
The state’s Beach Monitoring Program says Brown Water Advisories are usually lifted 24 to 72 hours after the rain stops and field staff have had a chance to check conditions at the beach, according to the Hawaii Beach Monitoring Program. Officials often tell swimmers to wait 48 to 72 hours after heavy rain before jumping back into water that was previously discolored. This advisory will stay in place until testing shows bacteria levels have dropped below action thresholds.
Where to get the latest updates
If you are trying to decide whether it is safe to swim, the state’s Clean Water Branch keeps a running list of active advisories online, and independent trackers such as SafeToSwimHawaii pull Department of Health data into quick lookup tools. At the shoreline, keep an eye out for posted brown-water signs and follow lifeguard instructions. If you develop symptoms after ocean contact, seek medical care and let your provider know about your recent water exposure.
