KAZALCI OKOLJA

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In general, larger supply zones have adequate drinking water quality. The most problematic are small supply zones due to frequent or permanent faecal contamination. Small supply zones are related to zones that cover 50-1.000 residents (most frequently 50-500 residents). Problematic are also some small supply zones with surface water like karst source soft drinking water. The results of chemical analysis indicate contamination of drinking water mostly with pesticides. The monitoring of drinking water does not include systems for drinking water supply serving less than 50 persons. Audit monitoring for determining the chemical parameters were not carried out for about 106.500 residents on systems with 50-500 residents. The quality of drinking water in the period 2004-2017 has slightly improved.


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, 2004-2017 (regular tests)
Sources: 

Institute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2014 ; National Laboratory of Health, Environment and Food, 2014-2018

Chart note: 

*Note to table VD8-1:

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 areas ; improvement can be misleading.

2 For smaller supply areas ( 50 to 500 population) were large differences in the number of samples taken for routine tests , the provisioning area , in individual years : in 2004-2005 were taken after 4 samples , in 2006-2009 one sample from 2010 onwards for 2 samples ; smaller supply areas and will also contribute the majority of non-compliant samples for E. coli.

Show data

Share of non-compliant samples (%)

small (50-1000)

medium (1001-10.000)

big (>10.000)

2004

29

6.70

2.60

2005

28

5.80

1.70

2006

24.10

4.60

0.40

2007

24.50

5.30

2.10

2008

24.61

4.45

0.71

2009

19.34

4.27

1.19

2010

18.89

3.68

0.51

2011

16

1

0.80

2012

12.30

1.80

0.40

2013

8.60

1.33

0.44

2014

7.87

1.11

0.17

2015

5.80

1.10

0.20

2016

5.70

1.70

0.10

2017

5.39

0.61

0.10

Figure VD08-2: Share of non-compliant samples for faecal contamination (the presence of E. coli) by size classes of drinking water supply areas and by public health administrative areas, 2017 (regular tests)
Sources: 

National laboratory of Health, Environment and Food, 2018

Show data

Share of non-compliant samples (%)

small (50-1000)

medium (1001-10.000)

big (>10.000)

Gorenjska

6.45

0

1.25

Goriška

6.25

0

0

JV Slovenija

4.55

0

0

Koroška

5.61

0

0

Obalno-kraška

15

0

0

Osrednjeslovenska

4.23

1.45

0

Podravska

11.22

3.53

0

Pomurska

2.53

0

0

Posavska

3.08

0

0

Primorsko-notranjska

13.64

0

0

Savinjska

2.94

0

0

Zasavska

3.85

0

0

Slovenija

5.39

0.61

0.10

Figure VD08-3: Share of non-compliant samples for chemical parameters (nitrates and pesticides, sometimes also arsenic, lead and nickel), by size classes of drinking water supply areas, 2004-2017 (occasional tests)
Sources: 

Institute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2014 ; National Laboratory of Health, Environment and Food, 2014-2018

Chart note: 

* Note to the table VD8-3:

1On the small supply areas periodical tests are carried out in the supply areas with 501 - 1000 residents. On supply areas with 50-500 inhabitants periodical tests carried out only in 5-10% of supply areas in the 2006-2010 period - each year on the other , and at 10 % in 2014.

In the years 2004 - 2005 and 2011 - 2013 sporadic trials in supply areas with 50-500 inhabitants are not implemented , and therefore show a trend common in small supply areas is not possible.

2 In 2011, the Monitoring of nitrates or pesticides is carried on the supply areas where in the recent years their presence was detected and there was a possibility that will occur above the 25 mg / loz . 0.05 g / l , so data over the years can not be directly compared.

3 In 2013 and 2017, the monitoring of pesticides has not been implemented in all supply areas , which are otherwise conducted periodic tests of chemical parameters.

Show data

Share of non-compliant samples

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

Figure VD08-4: Pesticides in drinking water, 2004 - 2017, by type of pesticide and the highest exceeded concentration, and the number of exposed inhabitants to the exceeded concentrations (ocassional tests) (limit value for pesticides in drinking water is 0,10 µg/l)
Sources: 

Institute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2014 ; National Laboratory of Health, Environment and Food, 2014-2018

Chart note: 

* Note to Figure VD8-4:

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

Show data

Atrazin

Bentazon

Bromacil

Desetil-atrazin

Dikamba

Dimetenamid

Klortoluron

Mekoprop

Metolaklor

Mezotrion

Permetrin

Permetrin

Metazaklor

Diuron

Pesticides - sum

Number of exposed

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

0.27

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

Figure VD08-5: Number of inhabitants exposed to exceeded nitrate concentrations in the drinking water, 2004-2017 (limit value for nitrate in drinking water is 50 mg/l)
Sources: 

Institute of Public health, 2005-2008; The Health Insurance Institute Maribor, 2009-2014 ; National Laboratory of Health, Environment and Food, 2014-2018

Chart note: 

* Note to Figure VD8-5:

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

Show data

Number of inhabitants

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

Figure VD08-6: Concentration of nitrate in drinking water samples (audit monitoring), Slovenia, 2017
Show data
Figure VD08-7: Exceeded values for chemical parameters in drinking water in 2017
Show data
Figure VD08-8: Non-compliant samples from E. coli, by size of supply zones (check monitoring), Slovenia, 2017
Show data


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