Expulsion measurement network to areas contaminated with nitrate pursuant to § 13a DüV (12/2022) and § 4 AVV GEA

The Excel table lists all groundwater quality points of the WFD and EUA/Nitrate Measuring Network NRW, which have been used for the designation of the “red” areas contaminated with nitrate and for the immission-based demarcation of polluted/unloaded sub-areas within the affected groundwater bodies (status: 12/2022). Non-agricultural monitoring sites with nitrate or nitrate input concentrations above the groundwater threshold or an increasing trend of nitrate are not included in the table as they are not included in the area identification according to AVV GEA. The table sheet contains the following information: — 9-digit official measuring point number and name of the measuring station — Municipality and district in which the measuring point is located — Groundwater body (ID and name) to which the measuring station is assigned during monitoring — Location coordinates (for reasons of data protection do not the last two points) — Dominant land use influence in the inflow area of the measuring point — Information whether a persistently increasing nitrate trend is currently present in the period 2009-2018 according to GrwV at the measuring point (yes/no) and whether there is a nitrate value > 37.5 mg/l — mean of the maximum values MWMxJW1619 (nitrate; mg/l) of the years 2016-2019 to the measuring point — nitrate input concentration (mg/l) in the period 2016-2019, where available (the mean value is used for several measurements). The basis is measurements of the parameter “Excess-N2 (converted to nitrate in mg/L)” and the “nitrate concentration” as the sum of the same groundwater sample. The data is available in ELWAS-web. The nitrate input concentration corresponds to the nitrate concentration before denitrification in groundwater. The excess N2 (N2 formed by nitrate degradation in excess) is determined by the N2/Ar method. — Decisive value from which the information is to be deduced whether the delimitation of contaminated/unloaded subareas MWMxJW1619 or nitrate input concentration is decisive. — Information whether the measuring point is relevant for the designation of “red field blocks” or not. This is the case for agriculturally influenced measuring points where the nitrate value (MWMxJW1619) or the nitrate input concentration is greater than 50 mg/l, as well as for agriculturally influenced measuring sites where there is a rising nitrate trend and the nitrate value (MWMxJW1619) is 37.5 mg/l or greater. The Excel file contains, in addition to the data table (table sheet “AWMN_2022_11”), a table sheet explaining the attributes (table sheet “Data Information”) as well as a table sheet containing information on the groundwater bodies (table sheet “GWK table”).