ZAMA CITY, Alta. -- A pipeline operated by a Texas-based oil company has leaked 9.5 million litres of industrial waste water in northern Alberta.

The Energy Resources Conservation Board says the spill was first reported by Apache Canada Ltd. on June 1.

The pipeline breach is about 20 kilometres northeast of Zama City, a remote community near the Northwest Territories boundary.

Apache says it has stopped the leak and is working to contain and clean up the spill that covers a 42-hectare area.

Waste water that is extracted during oil and natural gas operations contains oil, salt and other minerals.

Apache says the nearby Zama River has not been affected by the spill.