A disgruntled dairy farmer sprayed 12,000 litres of liquid manure near the offices of the Union des Producteurs Agricole south of Montreal this week.
Longureuil police took the man, 56, to hospital for evaluation.
It was one day when there was as much of the stuff outside as inside the UPA offices.
Patrice Juneau, a spokesman for the union, said the suspect is a dairy farmer who is facing financial difficulties and the union didn't wish to file a criminal complaint against him.
Longueuil police said he could still face a mischief charge, but the exact motivation for his alleged actions remained unclear.