Premier Stephen McNeil is keeping the deadline of the 2015 Boat Harbour Act.
Legislation that mandates Northern Pulp to stop dumping effluent into Boat Harbour at the end of January 2020.
The mill has been dumping toxic waste into the harbour in Pictou Landing First Nation for the last fifty years.
Northern Pulp asked for more time to find an alternative, otherwise they are closing the mill.
The Nova Scotia government said they will not grant an extension.
Pictou Landing Chief Andrea Paul says it is time her community starts to heal.
The cleanup is expected to take over four years.