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.
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2007
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 |
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2007
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 |
Marjeta Kranjc, Agencija Republike Slovenije za okolje