Illegal interconnection of drinking water and irrigation water system (Case study) Workshop on Water and Climate Adaptation

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Illegal interconnection of drinking water and irrigation water system (Case study)

  • Workshop on Water and Climate Adaptation (Amsterdam, 1–2 July 2008)

  • Martina Behanová

  • Public Health Authority of Slovak Republic

  • Dep.of environmental health

Involved stakeholders

Step by step

  • 16.7.2007 phone call to the PHA from citizens from Jaslovske Bohunice about suspicion on drinking water quality causing gastric problems

  • 16.7.2007 PHA analysed 2 samples of drinking water from the blocks of flats where affected citizens lived


  • 17.,18.7. laboratory confirmation of microbiological, biological, chemical contamination start of epidemiological investigation

Step by step


  • 19.7 a ban of drinking water usage from public water supply

  • Active investigation for cases in Jaslovske Bohunice in close cooperation with local GPs and municipality

  • The contamination of drinking water was confirmed also by laboratory analysis provided by TAVOS

  • Water company made checks along the whole distribution system in Jaslovske Bohunice and ensured emergency tanks of water for affected households

Step by step

  • Samples were taken from 4 places in Jaslovske Bohunice:

  • block of flats

  • ● municipality office

  • ● amphitheatre

  • ● fastfood kiosk

Measures taken by water company

  • Laboratory analysis from 17.7., 18.7. showed biological contamination and zero level of chlorine in samples taken near the block of flats

  • Flush of the whole distribution system + chlorination was done

  • Samples taken on 19.7 and 23.7 were NEGATIVE

Results of epidemiology investigation

Outbreak summary

  • Duration 12.7. – 22.7.2007

  • Number of cases: 125 (1500 exposed people, attack rate 8,3%)

  • Place: Jaslovske Bohunice

  • Vector of disease: Drinking water from public water supply

  • Etiology: not confirmed (according to microbiological cultivation of contaminated water, it is supposed to be infectious of E.coli (EPEC) or other coliforms or Entamoeba coli)

Interesting findings

  • Comprehensive investigation taken by TAVOS and municipality testified, that the epidemic outbreak occurred due to illegal interconnection of irregation water with drinking water from public supply

  • It is suspected that interconnection of systems was made in a garden area near the block of flats

  • PHA in cooperation with a water company informed the police and pressed charges against anonymous for the public danger

Lessons learned

  • Importance of public awareness and early detection system

  • Importance of well managed surveillance system of water-borne diseases

  • Close cooperation of water company and local authorities (public health, municipality)

Yüklə 521 b.

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