Key message
Neutral

In Slovenia, 98.7% of surface water bodies are in good chemical condition. The two water bodies are in poor chemical condition due to the excess of metals. In general, Slovenian surface waters are not loaded with priority substances in the water, but they are loaded with too high concentrations of mercury and brominated diphenylethers in fish. These are ubiquitous pollutants that are excessively present in biota both in Slovenia and in Europe.

Good or better ecological status is estimated for 49% of surface water bodies. The main reasons for the moderate or poorer ecological status of surface waters are hydromorphological change and general degradation, which are evaluated on the basis of the status of benthic invertebrate and fish communities. Compared to the previous assessment period, good ecological status is achieved by 9% fewer water bodies.


Charts

Figure VD12-1: Share of surface water bodies in individual chemical status classes for the water matrix
Sources:

National water quality monitoring database, Slovenian Environment Agency, 2021 (marec, 2021)

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no assessment[% of water bodies] bad status[% of water bodies] good status[% of water bodies]
2009-2013 0.60 4.50 94.80
0.60 3.20 96.10
0 1.30 98.70
Figure VD12-2: Assessment of the surface water chemical status for the biota matrix for the period 2014–2019
Sources:

National water quality monitoring database, Slovenian Environment Agency, 2021 (marec, 2021)

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Figure VD12-3: Assessment of the chemical status of surface waters for the matrix of waters and biota together without generally present (PBT) substances for the period 2014-2019
Sources:

National water quality monitoring database, Slovenian Environment Agency, 2021 (marec, 2021)

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Figure VD12-4: Shares of surface water bodies in individual classes of ecological status
Sources:

National water quality monitoring database, Slovenian Environment Agency, 2021 (March, 2021)

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  2006–2008 2009–2015 2016–2019
Ecological status / ecological potenical      
VERY GOOD 11 6 1
GOOD 69 80 64
MODERATE 41 36 46
POOR 7 8 17
VERY POOR 2 1 3
GOOD   4 10
MODERATE 9 11 9
POOR   3 4
UNRATED 15 5 0
Figure VD12-5: Share of surface water bodies that achieve / do not achieve good ecological status according to individual loads
Sources:

National water quality monitoring database, Slovenian Environment Agency, 2021 (marec, 2021)

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  nutrient overload     organic matter overload     hydromorphological changes/general degradation     special pollutants overload    
  2006–2008 2009–2015 2014–2019 2006–2008 2009–2015 2014–2019 2006–2008 2009–2015 2014–2019 2006–2008 2009–2015 2014–2019
achieving good status 119 115 124 113 114 120 59 90 75 134 136 140
not achieving good status 26 35 29 21 21 18 15 38 64 19 17 14
no assessment 9 4 1 4 3 0 80 26 15 1 1 0
Figure VD12-6: Assessment of the ecological status of surface waters for the period 2014-2019
Sources:

National water quality monitoring database, Slovenian Environment Agency, 2021 (marec, 2021)

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Methodology

Date of data source summarization