A man is dead after being trapped under a quad bike in a drain full of water near Dargaville.

A Ruawai farmer pulled the 42-year-old from the drain yesterday afternoon and started CPR but was unable to revive him.

The death comes 11 days after a Far North teen suffered serious injuries after the quad bike she was riding rolled and pinned her in a swamp near Ahipara. The girl's sister managed to get the bike off her but she was in a lot of pain and still partly under water when firefighters came to her aid.

In the latest incident, Dargaville police Senior Sergeant Rob Nordstrand said emergency services were called to the Armstrong Rd in Ruawai at 5.30pm on Sunday, but the victim died at the scene.

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Mr Nordstrand said the man lived at the farm but did not work there. He had been riding the quad bike to help shift some cows.

The farmer had driven away on his tractor and returned to find the bike on its side in a drain and the man underneath.

WorkSafe were investigating and police have handed the matter over to the coroner.