Concerning spatial variations, the results served to identify interesting
facts regarding drinking water quality not previously investigated in
small systems, more precisely: the consumption of free residual Cl is a
good indicator of residence time and strongly related to location;
water quality at the beginning of the DS is a good indicator of the quality
in the rest of the system; free residual Cl is consumed essentially from
the beginning to the middle of the DS, the location where the variability
of DBPs is highest. Finally, as in large systems, THM4 concentrations are
highest at the end of the DS and levels of HAA5 can decrease from the
beginning of the DS during summer and fall.