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[VD08] Drinking water quality
State

Key message
Neutral

In 2021, drinking water monitoring was carried out in supply zones (water supply systems) that supply 50 or more persons (94,6% of the population). Large, medium and some of small supply zones that supply more than 500 (90,0%) inhabitants, generally have adequate drinking water quality. The smallest supply zones that supply 50-500 inhabitants are the least regulated, in comparison to larger due to the fecal contamination, as some with karst water resources. The results of chemical analysis exceeded limit value of the pesticide desethyl-atrazine and bentazone, also for chemical parameter nickel, also for indicator chemical parameters: aluminium and iron. In the period 2004-2021, the quality of drinking water has improved, mainly due to the nitrates and pesticides.

Charts

Figure VD08-1: Share of non-compliant samples for faecal contamination (the presence of E. coli), by size classes of drinking water supply areas, 2004-2021
Sources:

Insitute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2022

Note:

1-Due to changes in sampling methodology - a different number of samples in each of the years in the size range of 50-500 inhabitants is not possible to estimate the trend for small supply zone, 2004-2021.

2 For smaller supply zone (50-500 inhabitants) were large differences in the number of samples taken for check monitoring, in individual years: in 2004-2005 were 4-5 samples, in 2006-2009 one sample, in 2010 2 samples; smaller supply zone with 50-500 inhabitant contribute the majority of non-compliant samples for E. coli.

Show data
LARGE (>10.000)[%] MEDIUM (1.001-10.000)[%] SMALL (501-1.000)[%] THE SMALLEST (50-500)[%]
2005 1.70 5.80 12.20 32
2006 0.40 4.60 11.20 30.80
2007 2.10 5.30 12.10 30.90
2008 0.70 4.40 7.90 34.40
2009 1.20 4.30 7.60 26.30
2010 0.50 3.70 6.60 24.30
2011 0.80 1 3.40 20.40
2012 0.40 1.80 2.80 15.70
2013 0.40 1.30 2.80 10.40
2014 0.20 1.10 1.50 10.40
2015 0.20 1.10 2 7.60
2016 0.10 1.70 1.30 7.30
2017 0.10 0.60 1.10 6.80
2018 0 0.80 0.80 5.20
2019 0.10 0.50 0 4.50
2020 0.10 0.80 0.40 7.20
2021 0 0 0.40 4.10
Figure VD08-2: Share of non-compliant samples for faecal contamination (the presence of E. coli) by size classes of drinking water supply zone and by public health administrative areas, 2021 (check monitoring - Group A parameters)
Sources:

2021 Drinking Water Supply Systems and Drinking Water Compliance Data Collection (NLZOH, 2022).

Show data
THE SMALLEST (50-500)[%] SMALL (501-1000)[%] TOTAL SMALL (50-1.000)[%] MEDIUM (1001-10.000)[%] LARGE (>10.000)[%] total[%]
Slovenija 4.10 0.40 3.40 0 0 1.78
Zasavska 2.70 0 1.90 0 0 1.38
Savinjska 4.70 0 3.70 0 0 1.92
Primorsko-notranjska 2.50 0 2.50 0 0 1.02
Posavska 1 0 0.80 0 0 0.57
Pomurska 0 0 0 0 0 0
Podravska 5.40 20 6.20 0 0 2.11
Osrednjeslovenska 5.10 0 3.80 0 0 1.53
Obalno-kraška 18.80 0 15.80 0 0 3.41
Koroška 1.20 0 1 0 0 0.69
JV Slovenija 1.10 0 1 0 0 0.46
Goriška 4.30 0 3.50 0 0 2.55
Gorenjska 7.50 0 6.30 0 0 3.70
Figure VD08-3: Non-compliant samples due to E. coli, by size classes of drinking water supply zones, Slovenia, 2021
Sources:

Database on systems for water supply and compliance of drinking water 2021, National Laboratory of Health, Environment and Food 2022; cartographic basis: Slovenian environment agency, The surveying and mapping authority of the RS; Data processing and cartography: National Institute for public health, 2022.

Note:

One non-compliant sample due to the presence of Escherichia coli was also in the framework of periodic trials in medium supply areas (medium (1001-10.000))

Show data
Figure VD08-4: Proportion of non-compliant samples for chemical parameters, by size classes of drinking water supply zone 2004-2021
Sources:

Institute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2022

Note:

In 2021, on the small supply zone audit monitoring are carried out in the supply areas with 501 - 1000 inhabitants and also in the supply areas with 50-500 but only for three supply zones On supply areas with 50-500 inhabitants audit monitoring carried out only in 5-10% of supply areas in the 2006-2010 period - each year on the other, and at 10 % in 2014-2016.

In the years 2004-2005 and 2011-2013 and 2017-2019 audit monitoring in supply zones with 50-500 inhabitants are not carried out.

Show data
SMALL (50-1000)[%] MEDIUM (1001-10.000)[%] LARGE (>10.000)[%] total[%]
2004 10.60 2.40 7.10 5.60
2005 6.70 2.90 7.60 5.30
2006 6.50 1.70 2.50 3.30
2007 7.10 2.30 1.90 3.50
2008 0.60 1.10 6.80 2.80
2009 5.80 1.80 3 3.20
2010 9.20 0.40 7 5.10
2011 7.70 2 2.10 3.40
2012 4.80 3.40 2.80 3.60
2013 2.80 1.30 1.80 1.90
2014 7 2.70 0.90 3.80
2015 5.10 1.90 1.60 3.10
2016 3.90 1.20 3.60 2.90
2017 1.10 0.60 1.50 1
2018 0 1.80 1.40 1.30
2019 2.20 0 0 0.50
2020 0.80 0 0 0.40
2021 2.20 0.60 0.80 1
Figure VD08-5: Number of inhabitants exposed to exceeded pesticide concentrations in drinking water and type of pesticide with the highest exceeded concentration, 2004–2021
Sources:

Insitute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2022

Show data
[µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l] [µg/l]
2004 0.21 0 0 0.29 0 0.26 0 0 0 0 0 0 0 0 0 183881
2005 0.16 0.98 0 0.32 0 0 0 0.21 0.57 0 0 0.49 0 0 0.93 151297
2006 0.18 1.40 0 0.42 0 0 0 0 0 0 0 0 0 0 1.40 36999
2007 0.30 0.48 0 0.30 0 0 0 0 0 0 0.21 0 0 0 0.55 53544
2008 0.20 0.40 0 0.30 0 0 0 0 0.14 0.12 0 0 0 0 0.66 100689
2009 0.15 0.37 0 0.26 0.23 0 0 0 0.65 0 0 0 0 0 0.66 98611
2010 0.19 0.14 0.16 0.41 0 0 0.11 0 0 0 0 0 0 0 0.56 183690
2011 0.21 0.12 0 0.42 0 0 0 0 0.13 0 0 0 0.12 0 0 83996
2012 0.19 0 0 0.25 0 0 0 0 0.21 0 0 0.16 0 0 0 105443
2013 0.21 0 0 0.58 0 0 0 0 0 0 0 0 0 0 0.64 21686
2014 0.21 0 0 0.29 0 0 0 0 0 0 0 0 0.27 0 0.51 6512
2015 0.22 0.36 0 0.27 0 0 0 0 0 0 0 0 0 0 0.52 33975
2016 0.10 0 0 0.14 0 0 0 0 0 0 0 0 0 0 0 29400
2017 0.14 0.65 0 0.13 0 0 0 0 0 0 0 0 0 0 0 288869
2018 0 0.37 0 0.12 0 0 0 0 0 0 0 0 0 0 0 1533
2019 0 0 0.15 0 0 0 0 0 0 0 0 0 0 0 1130
2020 0 0.11 0 0.20 0 0 0 0 0 0 0 0 0 0 0 1230
2021 0 0.10 0 0.12 0 0 0 0 0 0 0 0 0 0 0.80 28780
Figure VD08-6: Number of inhabitants exposed to exceeded nitrate concentrations in the drinking water, 2004-2021
Sources:

Insitute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2022

Note:

Number of inhabitants refers to the supply zone in which nitrates have been exceeded in drinking water.

Show data
Number of inhabitants[no.] Number - Max. Nitrate Concentration[no.]
2004 12243 84
2005 4046 93
2006 34321 75
2007 3555 60
2008 4022 62
2009 4898 66
2010 3327 66
2011 3404 71
2012 2862 71
2013 2862 66
2014 3047 66
2015 2862 66
2016 0 0
2017 0 0
2018 17000 53
2019 0 0
2020 0 0
2021 0 0
Figure VD08-7: Clone of Nitrate concentration in drinking water, 2021
Sources:

Database on systems for water supply and compliance of drinking water 2021, National Laboratory of Health, Environment and Food 2022; cartographic basis: Slovenian environment agency, The surveying and mapping authority of the RS; Data processing and cartography: National Institute for public health, 2022.

Figure VD08-8: Exceeded values for chemical parameters in drinking water in 2021
Sources:

Database on systems for water supply and compliance of drinking water 2021, National Laboratory of Health, Environment and Food 2022; cartographic basis: Slovenian environment agency, The surveying and mapping authority of the RS; Data processing and cartography: National Institute for public health, 2022.

Methodology

Other sources and literature:

  • Commission Directive (EU) 2015/1787 of 6 October 2015 amending Annexes II and III to Council Directive 98/83/EC on the quality of water intended for human consumption; Official Journal of the European Union L260/6.
  • Guidelines for drinking-water quality: fourth edition incorporating the first Addendum. Geneva: World Health Organization; 2017
  • IVZ RS, 2005. Monitoring pitne vode 2004: Poročilo o pitni vodi v Republiki Sloveniji. Inštitut za varovanje zdravja Republike Slovenije. Ljubljana, maj 2005.
  • IVZ RS, 2006. Monitoring pitne vode 2005: Poročilo o pitni vodi v Republiki Sloveniji. Inštitut za varovanje zdravja Republike Slovenije, Ljubljana, maj 2006.
  • IVZ RS, 2007. Monitoring pitne vode 2006: Poročilo o pitni vodi v Republiki Sloveniji. Inštitut za varovanje zdravja Republike Slovenije. Ljubljana, maj 2007.
  • IVZ RS, 2008. Monitoring pitne vode 2007. Poročilo o pitni vodi v Republiki Sloveniji. Inštitut za varovanje zdravja Republike Slovenije, Ljubljana, julij 2008.
  • Ministrstvo za okolje in prostor. Operativni program oskrbe s pitno vodo za obdobje od 2015 do 2020, Ljubljana 2015.
  • NLZOH, 2014. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2013.
  • NLZOH, 2015. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2014.
  • NLZOH, 2016. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2015.
  • NLZOH, 2017. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2016.
  • NLZOH, 2018. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2017.
  • NLZOH, 2019. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2018.
  • NLZOH, 2020. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2019.
  • NLZOH, 2022. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2021
  • Pravilnik o pitni vodi (Uradni list RS, št. 19/04, 35/04, 26/06, 92/06, 25/09, 74/15 in 51/17).
  • SRS, 2017. Strategija razvoja Slovenije 2030. Ljubljana : Služba Vlade Republike Slovenije za razvoj in evropsko kohezijsko politiko, 2017.
  • Strategija Republike Slovenije za zdravje otrok in mladostnikov v povezavi z okoljem 2012–2020. Sprejela Vlada Republike Slovenije, s sklepom št. 02401-13/2010/5, z dne 1.12.2011.
  • Vlada RS, 2006. Operativni program oskrbe s pitno vodo (Vlada RS; EVA: 2005-2511-0029), z dne 24.08.2006.
  • ZZV MB, 2009. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2008.
  • ZZV MB, 2010. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2009.
  • ZZV MB, 2011. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2010.
  • ZZV MB, 2012. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2011.
  • ZZV MB, 2013. Zbirka podatkov o sistemih za oskrbo s pitno vodo in o skladnosti pitne vode, 2012.
  • (Letopis NIJZ, 2023). Zdravstveni statistični letopis Slovenije. https://nijz.si/podatki/zdravstveni-statisticni-letopis-slovenije/.
Date of data source summarization
Last modified
17.04.2023
Author(s)

Ivanka Gale, Lara Ofentavšek , National Institute of Public Health