Hamilton City Council's reassuring there's been no environmental damage, after it accidentally leaked human waste into the Waikato River

In February last year, 1.7-million-litres of wastewater, including human sewage, was discharged

It's been handed a 54-thousand-dollar fine for the incident - after the regional council took it to court.

Hamilton City Council's waters manager Maire Porter says they have a strong commitment to protecting the environment.

She says they've since made improvements to processes.