An estimated 200 to 300 litres of lubricating oil has been spilt in Akaroa Harbour by the anchored Royal New Zealand Navy vessel HMNZS Te Kaha.
Environment Canterbury said it was notified of the incident immediately by the New Zealand Defence Force.
"We’re now working alongside them to monitor and support clean up efforts."
A New Zealand Defence Force spokesperson told 1News that immediate steps were taken to clean up the approximately 200-300 litres of lubrication oil from the 118m long vessel.
"Soaker pads were used to clean up surface oil and oil dispersed by crew on a RHIB following the leak, which was caused by a defect to an oil cooler on the starboard engine," they said in a statement.
"The source of the leak has been isolated and no further oil is leaking."
The ship remained anchored in Akaroa Harbour, NZDF said.
The ship's company was working with Environment Canterbury staff who are monitoring and assisting with clean-up efforts.
Authorities urged people to avoid the affected area if they see or smell oil.
Local resident Mark Robinson told 1News a visible oil slick was heading towards the Wainui side of the harbour.
In late January, a tourist boat ran aground near the mouth of Akaroa Harbour, resulting in 2240 litres of marine diesel fuel and 120 litres of other oils being leaked into the sea.
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