KAZALCI OKOLJA

Key message
Neutral

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

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

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

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

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

Methodology

Date of data source summarization