Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) is a selective herbicide used for control of broadleaf weeds, especially thistles and clovers.
As with all individual pesticides the EU legal limit for Clopyralid is 0.10 micrograms/litre in drinking water.
When it is found in drinking water it is usually a small amount above the EU legal limit
There is no WHO health-based guideline values set for Clopyralid in drinking water.