I. Zimoch, J. Paciej
Silesian University of Technology, Institute of Water and Wastewater Engineering, Gliwice, PL


One of the main threats to human health is poor quality of tap water, which despite undergoing treatment processes in modern WTPs, often doesn’t comply with the quality standards. There are many causes of that, thus WHO underlines importance of WSS management that is compatible with recommended water safety procedures. Those procedures cover assessment and risk management in the entire WSS from water intake to tap. In Poland, drinking water quality is controlled by Water Companies, based on governmental legislation. However in many cases some water quality parameters have been always way below the limit, but this fact doesn’t exempt Companies from their test. Therefore, the obligation of companies to test water for such parameters only creates extra costs. So, introducing freely control of water quality and risk assessments will allow for a large money savings and improvement of water consumers’ safety. In this paper a procedure for estimation of risk for human health safety lose as a result of too high level of microbiological contaminants (Escherichia coli, Enterokoki i Coliform bacteria). In this method number of water supply connection and the amount of delivered water was used to estimate the distribution of population over the examined area. This approach not only provided the opportunity for a spatial interpretation of poor water quality, but also to identify areas particularly vulnerable to the loss of health of water consumers.

Keywords: risk, water supply system, water contamination, bacteria