UV treatment at Porirua Wastewater Treatment Plant offline

Wellington Water this morning identified that the ultra-violet (UV) treatment equipment had been off since yesterday afternoon. It was reactivated as soon as it was discovered.
Ultra-violet (UV) light disinfection is the final stage in treating wastewater. The treatment process removes solids most of the harmful bacteria before it gets to the UV stage. UV disinfection destroys remaining bacteria and viruses before it is discharged to the sea.
The risk to health from this bypass is very small, as the tidal current will dilute and disperse the un-UV-treated wastewater. Wellington Water contractors are doing shoreline monitoring along Titahi Bay Beach and will share the results when they are available.
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