New Brunswick's Department of Environment is investigating after a spill from a truck rollover caused low-level contamination of nearby waterways.

A truck carrying salt brine from the potash mine in Sussex flipped on its side on Route 865 outside Norton on Thursday morning.

The driver was released from hospital with minor injuries.

Most of the truck's 27,000 litres spilled into the ditch and nearby Moosehorn Creek, which is a tributary of the Kennebecasis watershed, according to the department.

Tests were positive for salt brine, motor oil and possibly diesel fuel, officials said.

Sheena Mosher, who lives on Route 865, says this is the second time she has seen an accident like this near her home.

"A lot of the drivers drive a very good speed, they do 80 km/h and try to be courteous to other people on the road. But then you have a few mavericks that drive quite quickly, swerve over the yellow line," she said.

"If you're coming the other way you have to try and slow down so you don't hit this transport truck. It's a secondary road, it's not a divided highway. It's a good road, but it's not meant for high levels of speed."

About 300 trucks a day carry brine from the mine to be dumped until a pipeline is completed in November.

The Department of Environment is still trying to determine who is responsible for cleaning up the spill.