For overfladevand har over 98 % af overvågningsstederne gennemsnitlige nitratkoncentrationer på under 25 mg/l, og intet sted er der over 50 mg/l nitrat.
For surface waters, more than 98 % of monitoring sites have mean nitrate concentrations below 25 mg/l and no points have nitrate concentrations over 50 mg/l nitrate.