Legal action has been launched against the Nyrstar lead smelting facility at Port Pirie over the alleged pollution of a local creek.
The Environment Protection Authority is prosecuting Nyrstar Port Pirie Ltd for causing serious environmental harm.
The EPA complaint alleges that between January 31 and February 3 last year the company discharged or failed to prevent the discharge of about 700 litres of sulphuric acid into First Creek at Port Pirie.
'Potential environmental harm was caused by polluting the environment and creating harmful conditions for fish and other plant and animal life in the creek," the EPA said in a statement on Wednesday.
The matter will be heard in the Environment, Resources and Development Court of South Australia at a later date.