"This person had noted that a stream, that normally runs clear, was running green over several days particularly early in the morning."
The council staff went to the site on Friday morning and observed the pollution in the stream and were able to track it back some distance to its source.
"However, what we found on this occasion is of real concern. We have many farmers doing the right thing by the environment in our region but unfortunately there are still some in the sector who, quite simply, don't seem to care."
The council was now carrying out a formal investigation, but anticipated enforcement action would be taken.