Question to the Department for Environment, Food and Rural Affairs:

To ask His Majesty's Government what assessment they have made of anthelminthic concentrations in (1) freshwater generally, and (2) chalk streams specifically.

Our monitoring on emerging chemicals is conducted through targeted screening based on risk. Twelve anthelminthic chemicals are monitored across 21 fresh water sites. Of these sites 18 are chalk streams. There is currently no evidence of adverse effects from exposure to these substances.