Police and ambulance were also called in to help close roads and were on standby in case of any injuries.
However, the incident passed safely, Mr Upton said, with firefighters confirming the bubbling chemical was hydrogen peroxide, most commonly found in bleaching agents and disinfectants.
"The guys [on the scene] advised that they managed to neutralise and dilute the spill," Mr Upton said.
"So it's all tidied up and handed back to the business owner. I'm assuming they will have some commercial waste removal people come in and tidy it up."
WorkSafe NZ would also need to give the factory the all-clear, before work resumed, he believed.
No injuries were reported from the incident, which was over by 9am.