A discharge of dairy effluent yesterday (29 Oct) has contaminated a tributary of the Waimatuku Stream near Drummond.

Environment Southland (ES) is investigating the discharge and has issued a warning to avoid contact with water within that catchment..

ES had yesterday issued the warning for the Aparima River and its tributaries, but this has now been retracted.

An ES spokesperson said that as it was an open investigation, they were unable to provide any further comment.