City crews responded to Ko Olina Thursday night for a force main break that released more than 1,000 gallons of untreated sewage, according to city officials.
The call came in at around 9:10 p.m. and crews responded to 2750 Aliinui Drive.
The wastewater entered a storm drain that emptied near the Ko Olina Resort.
The Department of Health was notified. Warning signs are posted and officials took water samples.