Southland's regional council, Environment Southland, wants Fonterra to stop accepting milk from four big dairy farms that are polluting the region's streams.
The farms have been fined up to $20,000 for allowing effluent to flow straight into waterways.
Environment Southland compliance manager Mark Hunter says it is not the first time the council has taken action against some of the farms.
Mr Hunter says the council has forwarded information about the discharges to Fonterra for consideration by the company.
