The overall costs of water pollution caused by agriculture across OECD countries both in terms of treatment for consumption and in terms of damage to ecosystems are likely to exceed billions of euros annually (Gruere, 2016(7], OECD, 2017(6]).' At the same time, in many regions agricultural production is subject to water risks mainly due to climate variability, extreme events, depleting groundwater resources, but it also faces resource competition from other sectors (OECD, 2017(2]). Recent reports show that diffuse pollution from agriculture continues to be problematic in spite of policy efforts (Wang, Tyau and Ybanez, 2017(8], Wasley, Fiona and Davies, 2017(9], Melia, 2017[ioj, OECD, 2017(6]). Droughts and floods continue to have lasting and potentially devastating impacts on agriculture in many regions (OECD, 2016(d).