EU Member States are required to monitor the effectiveness of their Nitrates Regulations, under Article 5 (6) of the EU Nitrates Directive¹. Under the GAP Regulations³, DAFM has been monitoring the effectiveness of Ireland’s measures since 2008 through its significant funding of the Teagasc operated Agricultural Catchments Programme (ACP). Phase 3 runs from 2016 to 2019, funding of €1.56 million per annum is provided. The ACP works in partnership with over 300 farmers in six intensively farmed catchments. The outcomes of this research provide a valuable insight into the processes that determine the impact of agricultural activity on water quality in the catchments. Following ten years of intensive monitoring across the six catchments results indicate a positive response to the Nitrates Regulations, i.e. reduced nutrient inputs, increased nutrient management and some evidence of reduced nutrient losses from farmland to water. As a result, water quality trends are showing signs of recovery, although there are time lags between the implementation of measures and realising measurable improvements in water quality. Overall, evidence from the ACP indicates that supporting farmers, through technical advice, to make better decisions regarding how they manage nutrient applications, offers the greatest potential to improve outcomes for water quality on Irish farms. Scientific knowledge generated by the ACP helps fulfil Ireland’s monitoring and reporting requirements under the Nitrates Directive, including the Nitrates Derogation, and the Water Framework Directive (WFD³), and provides the basis for technology transfer to stakeholders.