Ms Mary Gurrie:

On nitrogen, there is a drinking water standard for nitrate as well. At low concentrations and up, it causes an ecological impact in the form of overgrowth and knocks out the ecosystem but there is a drinking water standard of 50 mg per litre. The drinking water then must be treated as the level must be kept at less than that. That can be an issue in groundwater in particular. This is not so much the case with phosphorus. It is more about eutrophication. Pesticides are obviously a health risk if they are present in water and drinking water, so that would be the primary concern with them from a health point of view. They also have a toxic impact on a river and on the wildlife in a river if they are present. We see those toxic impacts in rivers. Sediment can knock out the functioning of an ecosystem. Certain salmon need clean gravel beds different habitats to spawn so a lot of sediment can cause problems. Freshwater pearl mussels and some of other protected species can be impacted on by sediments. What was the fourth aspect? Have I missed something?