Mecoprop is a common general use herbicide found in many household weed killers and “weed-and-feed” type lawn fertilizers. It is primarily used to control broadleaf weeds. It is often used in combination with other chemically related herbicides such as 2,4-D, dicamba, and MCPA
It is one of the four most common agri chemicals found in Irish drinking water
https://www.corkbeo.ie/news/local-news/excessive-levels-pesticides-found-cork-20242941