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[VD08] Drinking water quality
State

Key message
Bad

Bigger supply areas generally have adequate drinking water quality. From preventive health point of view, the most problematic are small supply areas, serving 50-1000 inhabitants, mainly due to faecal contamination. The results of chemical tests indicate contamination of drinking water with pesticides and nitrates, particularly in the northeast and southeast Slovenia. The problem are also supply areas which are supplied with surface water, among which in terms of risks to health are included in karst sources of drinking water, as they have occasionally faecal contamination.

Charts

Figure VD08-1: The share of non-compliant samples for faecal contamination (the presence of E. coli) by size classes of drinking water supply areas in period 2004-2012 (regular tests)
Sources:

Institute of Public Health of the Republic of Sloveni,2005-2008;ZZV MB, 2009-2013.

Show data
2004 2005 2006 2007 2008 2009 2010 2011 2012
small (50-1000) % 29 28 24 25 25 19 19 16 12
medium (1001-10.000) % 7 6 5 5 4 4 4 1 2
big (>10.000) % 3 2 0 2 1 1 1 1 0
TOTAL % 19 18 10 11 10 8 9 8 7
Figure VD08-2: The 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, 2012 (regular tests)
Sources:

Institute of Public Health of the Republic of Slovenia, 2005 - 2008; ZZV MB, 2009-2013

Show data
Slovenia Pomurska Podravska Koroška Savinjska Zasavska Spodnjepos. SW Slovenia Not.-kraška Osrednjeslov.
small (50-1000) nmb. 12.3 7.4 13.7 13.1 6.4 11.5 13.5 19.1 23.7 11.1
medium (1001-10.000) % 1.8 4.4 6.7 1 11.1
big (>10.000) nmb. 0.4 0.5 1.2
TOTAL nmb. 6.7 4 4.7 11 3.5 5.9 12.1 9.8 10.6 4.5
Gorenjska Goriška Obalno.kraška
small (50-1000) nmb. 15.9 11.5 20.8
medium (1001-10.000) % 1.3
big (>10.000) nmb.
TOTAL nmb. 7.9 8.5 5.1
Figure VD08-3: The share of non-compliant samples for chemical parameters (nitrates, pesticides, arsenic), by size classes of drinking water supply areas, 2004-2012 (occasional tests)
Sources:

Institute of Public Health of the Republic of Slovenia,2005 - 2008; ZZV MB, 2009-2013.

Show data
2004 2005 2006 2007 2008 2009 2010 2011 2012
small (50-1000) % 10.6 6.7 6.5 7.1 0.6 5.8 9.2 7.7 4.8
medium (1001-10.000) % 2.4 2.9 1.7 2.3 1.1 1.8 0.4 2 3.4
big (>10.000) % 7.1 7.6 2.5 1.9 6.8 3 7 2.1 2.8
Figure VD08-4: Pesticides in drinking water during the period 2004 - 2012, 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; ZZV MB, 2009-2013.

Show data
2004 2005 2006 2007 2008 2009 2010 2011 2012
Atrazin µg/l 0.2 0.2 0.2 0.3 0.2 0.2 0.2 0.2 0.2
Bentazon µg/l - 1 1.4 0.5 0.4 0.4 0.1 0.1
Bromacil µg/l - - - - - - 0.2
Desetil-atrazin µg/l 0.3 0.3 0.4 0.3 0.3 0.3 0.4 0.4 0.2
Dikamba µg/l - - - - - 0.2 -
Dimetenamid µg/l 0.3 - - - - - -
Klortoluron µg/l - - - - - - 0.1
Mekoprop µg/l - 0.2 - - - - -
Metolaklor µg/l - 0.6 - - 0.1 0.7 - 0.1 0.2
Mezotrion µg/l - - - - 0.1 - -
Permetrin µg/l - - - 0.2 - - -
Terbutilazin µg/l - 0.5 - - - - - 0.2
Metazaklor µg/l - - - - - - - 0.1
Pesticidi-vsota µg/l - 0.9 1.4 0.6 0.7 0.7 0.6 -
Number of exposed inhabitants No. 183881 151297 36999 53544 100689 98611 183690 83996 105443
Figure VD08-5: The number of exposed inhabitants to exceeded nitrate concentrations in the period 2004-2012 (the limit value for nitrate in drinking water is 50 mg / l)
Sources:

Institute of Public Health of the Republic of Slovenia, 2005 - 2008; ZZV MB, 2009-2013.

Show data
2004 2005 2006 2007 2008 2009 2010 2011 2012
Number of inhabitants no. 12243 4046 34321 3555 4022 4898 3327 3404 2862
Max. Concentration of nitrates no. 84 93 75 60 62 66 66 71 71
Figure VD08-6: Nitrate content in drinking water in 2011
Sources:

ZZV Maribor, 2011.

Figure VD08-7: The content of the sum of pesticides in drinking water in 2011
Sources:

ZZV Maribor, 2011.

Figure VD08-8: Non-compliant samples due to E. coli, by size classes of supply areas, Slovenia, 2011
Sources:

ZZV Maribor, 2011

Methodology

Date of data source summarization
Last modified
04.09.2013
Author(s)

Ivanka Gale, dr.med., Katarina Bitenc, univ.dipl.soc., Aleš Petrovič, dr.med. (medical specialists in hygiene), National Institute of Public Health, Center for Environmental Health;