Slovenian groundwater bodies most polluted with nitrates are those with intergranular (alluvium) aquifers, particularly in northeastern Slovenia. Groundwater in karst and fractured aquifers is due to geographical conditions, low population density and scarce agricultural land less burdened with nitrates. On water bodies Mura basin and Savinja basin average annual levels of nitrate in the period from 1998 to 2011 show a statistically significant downward trend in nitrate levels. In Drava basin nitrate levels have not been increasing for some years, but in 2011 the statistically significant trend of declining in seen. On the other water bodies declining nitrate levels are not statistically significant.
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2012
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2012; EEA Waterbase_groundwater_v10, 2011
2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | ||
---|---|---|---|---|---|---|---|---|---|
Slovenija - alluvial aquifers | mg/l | 40.6 | 40.3 | 38.6 | 31.8 | 32.8 | 32.9 | 31.9 | 31.2 |
Slovenia - karst-fractured aquifers | mg/l | 7.5 | 7.4 | 7.4 | 7.3 | 6.8 | 6.6 | 5.5 | 6.6 |
Slovenia - average | mg/l | 15.4 | 15.2 | 14.8 | 13.1 | 13 | 12.8 | 11.8 | 12.5 |
Europa - average | mg/l | 19.6 | 19.5 | 19.3 | 19.1 | 19 |
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2012
1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | ||
---|---|---|---|---|---|---|---|---|---|---|---|
1001 Savska kotlina in Ljubljansko barje | mg/l | 23.4 | 22.8 | 21.6 | 21.9 | 20.7 | 20.7 | 20.9 | 22.9 | 22.7 | 18.4 |
1002 Savinjska kotlina | mg/l | 50 | 43.8 | 47.2 | 55.5 | 43.9 | 50.5 | 65 | 57.8 | 45.4 | 47.3 |
1003 Krška kotlina | mg/l | 21.8 | 23.8 | 20.4 | 25.7 | 33 | 22.3 | 29.4 | 24.8 | 26.9 | 21.1 |
3012 Dravska kotlina | mg/l | 45.1 | 48.4 | 45.4 | 46.5 | 39.7 | 40.3 | 49.5 | 54 | 53.3 | 39.1 |
4016 Murska kotlina | mg/l | 47.6 | 39.8 | 47.3 | 34.4 | 39.9 | 38 | 42 | 44.7 | 32.9 | |
quality standard | mg/l | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
2008 | 2009 | 2010 | 2011 | ||||||||
1001 Savska kotlina in Ljubljansko barje | mg/l | 19.6 | 20.6 | 19.2 | 19.2 | ||||||
1002 Savinjska kotlina | mg/l | 48.7 | 44.8 | 42.5 | 43.2 | ||||||
1003 Krška kotlina | mg/l | 23.2 | 24.2 | 24.1 | 21.6 | ||||||
3012 Dravska kotlina | mg/l | 40.3 | 42.1 | 42.2 | 39 | ||||||
4016 Murska kotlina | mg/l | 32.2 | 32.6 | 31.8 | 32.9 | ||||||
quality standard | mg/l | 50 | 50 | 50 | 50 |
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2012
1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | ||
---|---|---|---|---|---|---|---|---|---|---|---|
Lipovci | mg/l | 127.3 | 120.3 | 128.6 | 105.9 | 95.2 | 94.5 | 100 | 110.3 | 92.8 | |
Lancova vas | mg/l | 76.2 | 73 | 81.1 | 85.3 | 82 | 79.7 | 87.1 | 93 | 94.5 | 86.5 |
Šempeter | mg/l | 97 | 84.2 | 77.6 | 106.1 | 99.7 | 95.2 | 125.5 | 95.5 | 74 | 75.3 |
Godešič | mg/l | 58.5 | 64.4 | 67.2 | 76.9 | 62 | 59.8 | 59.1 | 67.8 | 66.3 | 60.7 |
quality standard | mg/l | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
2008 | 2009 | 2010 | 2011 | ||||||||
Lipovci | mg/l | 86.5 | 82 | 73 | 91 | ||||||
Lancova vas | mg/l | 91 | 88.5 | 77.5 | 82 | ||||||
Šempeter | mg/l | 88.5 | 75 | 62 | 64.5 | ||||||
Godešič | mg/l | 68.3 | 63.7 | 64.2 | 67.3 | ||||||
quality standard | mg/l | 50 | 50 | 50 | 50 |
Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2012