No formal enforcement action has been taken against the Central Otago District Council (CODC) after flooding in July caused untreated wastewater to enter the Manuherikia River.

The floods, thought to be third highest ever recorded, were the second in the past five years to inundate the low-lying treatment facility.

The term ‘wastewater’ refers to sewage – everything flushed down toilets, kitchen sinks and laundries. Preference for where it should best be discharged to has evolved from waterbodies to land.

Regional councils issue consents for treated wastewater discharge and fines in the tens of thousands of dollars are not uncommon when these are breached.

The cost of a long-term solution to prevent a repeat event is unknown but is thought to be in the tens of millions.

This will fall on ratepayers to fund, CODC confirmed yesterday (Tuesday October 11), if the government’s unpopular Three Waters Reforms are scuppered by a change in government next year.

Otago Regional Council compliance manager Tami Sargeant said the agency closely monitored CODC’s flood response and remediation of the site.

“This included several site visits and receiving regular updates on remedial actions from CODC. No formal enforcement action was taken.”

She said it was not ORC’s role to provide advice on the solution, as this is for CODC as the infrastructure owner to consider. 

“However ORC does provide advice on our Regional Plan rules and any actions or activities that require consent. We are aware that CODC are preparing a business case which is considering alternative options for treatment of wastewater from both Omakau and Alexandra.”

 CODC water services manager Ian Evans said repairs at Omakau were now completed and had fortunately been less significant than first thought.

“The biological recovery of the pond system continues to improve with recent samples demonstrating a high level of compliance.”

CODC was continuing to update the ORC and Aukaha (manawhenua-owned consultancy) on progress. 

While the ORC set the limits and expectations of councils’ three waters (storm, waste and drinking water) activities it was not their role to fund any operations or infrastructure improvements.

Ian Evans said there were no options for financial assistance for three waters.

He confirmed CODC was working on a business case for options for alternative treatment and discharge for Omakau and Alexandra wastewater. These included a possible combined treatment plant and alternative locations for treatment and discharge to land.

“If council continues to deliver these services the Central Otago community will need to fund this upgrade. Central Government funding is not available.”