Warning signs are posted at Wahiawa Reservoir and Nuupia Pond in Kailua after spills of more than 300,000 gallons of raw and partially-treated sewage.
The city reports that 187,153 gallons of partially disinfected and treated sewage went through the outfall of the Wahiawa Wastewater Treatment Plant into the Wahiawa Reservoir between 6:02 a.m. until 8 a.m. Monday.
The effluent went through full secondary treatment and partial ultraviolent disinfection. Of the four UV banks of lights, the last one did not come online during the time high flows were pumped through the UV channel. City engineers are investigating why the last bank of lights did not activate.
The partially-treated sewage went out throught outfall of the Wahiawa Wastewater Treatment Plant into the Wahiawa Reservoir.
The discharge occurred between 6:02 a.m. until 8:00 a.m. Monday.
The city also revised its estimate of the amount of raw sewage dumped into Nuupia Pond Monday from 4.950 gallons to 125,000 gallons.
The Kailua Regional Wastewater Treatment Plant experienced high flows into the plant causing the solid contractor tank to overflow sending raw wastewater into Nuupia Pond, the city said. The spill started at 7:50 a.m. and was secured at 8:40 a.m. Monday.
Warning signs have been posted and water samples are being collected at Kailua and Wahiawa. The public is advised to remain out of these areas until the signs have been removed.
On Kauai, the state Department of Health reports 2,000 gallons of wastewater went into a stream that enters Puu Poa marsh from the Princeville Utilities Co.
The company said a line by a pump station near the lower tennis courts at the Hanalei Bay Resort broke, causing the spill.
Warning signs are posted along a beach area fronting the St. Regis Hotel.
The utility said workers repaired the line and disinfected the area.