Protection of Water Resources from Agriculture Pollution: An Integrated Methodological Approach for the Nitrates Directive 91-676-EEC Implementation.

Criterion for the Selection of Water Monitoring Points Functional to the Identification and Correct Perimeter of Nitrates Vulnerable Zones The water monitoring points were selected in which critical issues were found in the last four years of monitoring (2015–2019) based on the information now available to which the following criteria were applied: at least an excess of 50 mg/L in value in the last four years following an extremely precautionary approach; average in the last four years between 40–50 mg/L with an increasing trend; water monitoring points already in NVZs but for which there have been no samplings in the last four years; However, the points with the following criteria were not selected: average in the last four years between 40–50 mg/L with a stable to decreasing trend; average in the last four years between

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