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[VD08] Drinking water quality
State

Key message
Neutral

In 2019, drinking water monitoring was carried out in supply zones (water supply systems) that supply 50 or more persons (93% of the population). Large and medium supply zones that supply more than 1,000 (85%) of the population, generally have adequate drinking water quality. The smallest supply zones that supply 50-500 people are the least regulated, in comparison to larger due to the fecal contamination, as some with surface and karst water resources. The results of chemical analysis exceeded limit value of the pesticide desethyl-atrazine (1,130 people exposed), and indicator parameters: aluminium, manganese and iron. In addition, audit monitoring for chemical parameters were not carried out for 96,518 residents on supply zones with 50-500 residents. In the period 2004-2019, 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, 2004-2019 (check monitoring)
Sources:

Insitute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2020 (21. 10. 2020)

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, 2004-2019.

2 For smaller supply zone (50-500 residents) 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 residents contribute the majority of non-compliant samples for E. coli.

Show data
small (50-1000)[%] medium (1001-10.000)[%] large (>10.000)[%] total[%]
2004 29 6.70 2.60 19
2005 28 5.80 1.70 18.40
2006 24.10 4.60 0.40 10.30
2007 24.50 5.30 2.10 10.90
2008 24.61 4.45 0.71 10.30
2009 19.34 4.27 1.19 8.45
2010 18.89 3.68 0.51 9.05
2011 16 1 0.80 7.60
2012 12.30 1.80 0.40 6.70
2013 8.60 1.33 0.44 4.34
2014 7.87 1.11 0.17 3.67
2015 5.80 1.10 0.20 3
2016 5.70 1.70 0.10 3.10
2017 5.39 0.61 0.10 2.77
2018 4.10 0.80 0 2.10
2019 3.40 0.47 0.10 1.70
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, 2019 (check monitoring - Group A parameters)
Sources:

National laboratory of Health, Environment and Food, 2020 (21. 10. 2020)

Show data
small (50-1000)[%] medium (1001-10.000)[%] big (>10.000)[%]
Gorenjska 1.06 0 0
Goriška 4.05 0 0
JV Slovenija 2.63 0 0
Koroška 2.73 0 0
Obalno-kraška 15 0 0
Osrednjeslovenska 2.05 0 0.31
Podravska 5.10 2.56 0
Pomurska 0 0 0
Posavska 0.78 0 0
Primorsko-notranjska 7.50 0 0
Savinjska 3.45 0 0
Zasavska 2.42 2.44 0
Slovenija 3.40 0.47 0.10
Figure VD08-3: Non-compliant samples due to E. coli, by size classes of drinking water supply zones, Slovenia, 2019
Sources:

Database on systems for water supply and compliance of drinking water 2019, National Laboratory of Health, Environment and Food 2020; cartographic basis: Slovenian environment agency, The surveying and mapping authority of the RS; Data processing and cartography: National Institute for public health, 2019. (21. 10. 2020)

Note:

One non-compliant sample due to the presence of Escherichia coli was also in the framework of periodic trials in large supply areas (Large (> 10,000);

- Total regular and periodic tests: 2 non-compliant samples in a large class of 10,000 - 20,000 inhabitants.

Show data
Figure VD08-4: Proportion of non-compliant samples for chemical parameters (nitrates and pesticides, sometimes also arsenic, lead, aluminium, manganese, iron and nickel), by size classes of drinking water supply zone 2004-2019 (Audit monitoring - Group B parameters)
Sources:

Institute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2020 (21. 10. 2020)

Note:

In 2019, on the small supply zone audit monitoring are carried out in the supply areas with 501 - 1000 residents. 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 residents are not carried out.

Show data
small (50-1000)[%] medium (1001-10.000)[%] big (>10.000)[%]
2004 10.60 2.40 7.10
2005 6.70 2.90 7.60
2006 6.50 1.70 2.50
2007 7.10 2.30 1.90
2008 0.61 1.14 6.83
2009 5.80 1.81 3
2010 9.20 0.43 6.95
2011 7.75 2.02 2.12
2012 4.80 3.40 2.80
2013 2.80 1.33 1.83
2014 6.96 2.68 0.89
2015 5.10 1.90 1.60
2016 3.90 1.20 3.60
2017 1.06 0.61 1.46
2018 0 1.80 1.40
2019 2.20 0 0
Figure VD08-5: Number of inhabitants exposed to exceeded pesticide concentrations in drinking water and type of pesticide with the highest exceeded concentration, 2004–2019 (limit value for pesticide in drinking water is 0.10 µg/l, for the sum of pesticides is 0.50 µg/l)
Sources:

Insitute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2020 (21. 10. 2020)

Note:

Number of inhabitants refers to the supply areas in which a certain pesticide or more pesticides has been exceeded in drinking water.

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 0.65 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 28869
2018 0 0.37 0 0.12 0 0 0 0 0 0 0 0 0 0 0 1533
2019 0 0 0 0.15 0 0 0 0 0 0 0 0 0 0 1130
Figure VD08-6: Number of inhabitants exposed to exceeded nitrate concentrations in the drinking water, 2004-2019 (limit value for nitrate in drinking water is 50 mg/l)
Sources:

Insitute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2013; National Laboratory of Health, Environment and Food, 2014-2020 (21. 10. 2020)

Note:

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

Show data
Number of inhabitants[no.]
1995 112498
1996 89928
1997 22969
1998 1813
1999 2390
2000 1835
2001 3530
2002 3716
2003 15518
2004 12243
2005 4046
2006 34321
2007 3555
2008 4022
2009 4898
2010 3327
2011 3404
2012 2862
2013 2862
2014 3047
2015 2862
2016 0
2017 0
2018 17000
2019 0
Figure VD08-7: Nitrate concentration in drinking water, 2019
Sources:

Database on systems for water supply and compliance of drinking water 2019, National Laboratory of Health, Environment and Food 2020; cartographic basis: Slovenian environment agency, The surveying and mapping authority of the RS; Data processing and cartography: National Institute for public health, 2019 (21. 10. 2020)

Figure VD08-8: Exceeded values for chemical parameters in drinking water in 2019
Sources:

Database on systems for water supply and compliance of drinking water 2019, National Laboratory of Health, Environment and Food 2020; cartographic basis: Slovenian environment agency, The surveying and mapping authority of the RS; Data processing and cartography: National Institute for public health, 2019 (21. 10. 2020)

Methodology

Date of data source summarization
Last modified
21.10.2020
Author(s)

Ivanka Gale, Vili Prodan, National Institute of Public Health