A red discharge has been found in the poison-and pollution-plagued Stony Creek for the second time in as many months.

Investigators from the Victorian Environment Protection Authority returned to the Yarraville site on Wednesday after a community member spotted the discolouration the previous evening.

Another red discharge has polluted Stony Creek in Yarraville. Credit:EPA

The pollution was found near where a five-litre bottle of red dye owned by a nearby chemical manufacturing company blew over in the wind in September and turned a section of the creek blood red.

That company, Brooklyn-based Marchem Australasia, is not believed to be responsible for the latest incident but EPA investigations are ongoing.