The All-China Environment Federation said on Friday that it is suing PetroChina, the nation's largest oil and gas producer, for illegally discharging waste drilling water in northeastern Jilin Province.

The organization is demanding that the company pay 60.75 million yuan (almost $10 million) for environmental restoration.

PetroChina refused to comment on the lawsuit but a statement on Thursday said that an investigation team had been sent to Jilin.