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The evacuation of households in Tuakau last night (July 21) due to a hazardous substance in wastewater is a stark reminder of the dangers posed by contamination, IAWAI chief executive Peter Winder says.
“This sort of incident poses significant risks to [people] as well as potential damage to our network and plant operations.”
The exact nature of the substance and how it came to be in the wastewater system is yet to be identified but indications are that it was a petroleum or oil-based product. It is thought to have come from a commercial/industrial property in the town, Winder confirms.
IAWAI is a council owned company responsible for managing water services in Waikato.
As previously reported, Fire and Emergency NZ (FENZ) evacuated (approx) 12 properties in Tuakau yesterday evening following reports of a strong chemical smell. The substance, deemed hazardous, was isolated and wastewater pipes where then flushed.
Before FENZ was called, the odour was initially noticed at the Pukekohe Wastewater Treatment Plant earlier in the day. Investigations tracked the substance to a pump station in Tuakau.
The issue was contained to the wastewater network – stormwater and drinking water systems were not affected, IAWAI advises.
When atmospheric readings confirmed that the air quality returned to safe levels late last night, locals were able to return home.
“We appreciate the efforts of FENZ, police and other emergency services who responded, as well as our IAWAI staff and [Auckland’s] Watercare,” Winder says. “We thank the residents for their understanding.”
The incident underlines the importance of people and businesses following the rules regarding disposal of hazardous substances, Winder adds.
“Our wastewater networks operate under strict bylaws with penalties of up to $200,000 for allowing non-compliant substances into our systems. Costs for dealing with damage can be recovered from people or businesses responsible.
“It is extremely frustrating that this entire event appears to have been completely avoidable.”
Investigations, supported by IAWAI, will continue in efforts to establish the source of the substance. The Times will provide an update as soon as results are released.
