A "rat pack" has formed in Ngongotahā with the goal of eradicating rats on properties between the Waiteti and Ngongotahā streams.
So far the crew of about eight have been building poisonless rat traps and liaising with neighbours to see if there's an interest in having them on their properties.
"Rats are a problem because they carry diseases, kill ducklings and eat bird eggs and nestlings," organiser Martyn Evans said.
Evans and his neighbour Delight Gartlein live along the lake's edge and said rats are frequently seen there.
"We want to get rid of as many rats as possible before our birds start nesting," he said.