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Pollution of groundwater by nitrates is represented by the share of sampling points at aquifers with inter-granular and Karst-fracture porosity where threshold values of NO3 concentrations in samples taken were exceeded at all times, occasionally or never. The threshold value concerning NO3 concentrations in groundwater is determined in the Decree on the Standards of Quality of Underground Water (OJ RS No 100/05) and constitutes 50 mg NO3/l.


Charts

Figure VD05-1: Frequency of excessive burdening by nitrates (concentrations exceeding 50 mg NO3/l) at sampling points at selected water bodies in 2005
Sources: 

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2007

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Savska kotlina in Ljubljansko barje Savinjska kotlina Krška kotlina Kraška Ljubljanica Mursko polje Obala in Kras z Brkini Goriška Brda in Trnovsko-Banjška planota
total number 33 13 11 2 12 3 9
no exceedances number 30 4 10 2 6 3 8
no exceedances % 91 31 91 100 50 100 89
periodical exceedances number 0 2 1 0 3 0 0
periodical exceedances % 0 15 9 0 25 0 0
constant exceedances number 3 7 0 0 3 0 1
constant exceedances % 9 54 0 0 25 0 11
Figure VD05-2: Trend in nitrate concentrations at monitored water bodies of groundwater
Sources: 

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2007

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1998 1999 2000 2001 2002 2003 2004 2005
Savska kotlina in Ljubljansko barje mg NO3/l 22.2 22.3 21.9 20.3 20 29.6 22.4 26.2
Savinjska kotlina mg NO3/l 52.4 44.1 47.5 55.8 43.9 47.3 55.6 48.8
Krška kotlina mg NO3/l 24.3 27.9 22.5 26.8 31.6 25.4 31.9 27.7
Mursko polje mg NO3/l 57 47.9 56.8 41.5 46 41.1 45.2

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