Pressure monitoring and characterization of external sources of contamination at the site of the payment drinking water epidemiological studies. - Archive ouverte HAL Access content directly
Journal Articles Environmental Science and Technology Year : 2010

Pressure monitoring and characterization of external sources of contamination at the site of the payment drinking water epidemiological studies.

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Abstract

The 1990s epidemiological studies by Payment and colleagues suggested that an increase in gastrointestinal illnesses observed in the population consuming tap water from a system meeting all water quality regulations might be associated with distribution system deficiencies. In the current study, the vulnerability of this distribution system to microbial intrusion was assessed by characterizing potential sources of contamination near pipelines and monitoring the frequency and magnitude of negative pressures. Bacterial indicators of fecal contamination were recovered more frequently in the water from flooded air-valve vaults than in the soil or water from pipe trenches. The level of fecal contamination in these various sources was more similar to levels from river water rather than wastewater. Because of its configuration, this distribution system is vulnerable to negative pressures when pressure values out of the treatment plant reach or drop below 172 kPa (25 psi), which occurred nine times during a monitoring period of 17 months. The results from this investigation suggest that this distribution system is vulnerable to contamination by intrusion. Comparison of the frequency of occurrence of negative pressure events and repair rates with data from other distribution systems suggests that the system studied by Payment and colleagues is not atypical.
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Dates and versions

pasteur-00819607 , version 1 (01-05-2013)

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Marie-Claude Besner, Romain Broséus, Jean Lavoie, George Di Giovanni, Pierre Payment, et al.. Pressure monitoring and characterization of external sources of contamination at the site of the payment drinking water epidemiological studies.. Environmental Science and Technology, 2010, 44 (1), pp.269-77. ⟨10.1021/es901988y⟩. ⟨pasteur-00819607⟩

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