In the first quarter of the year 2007, the number of rural laboratories had grown from 90 units in the year 2003 to 166 units, showing a 87.93% growth while the quality parameters in the years 2004 and 2006 increased from 90.13 to 91.43% for residual chlorine and from 84.37 to 93.07% for lack of E.coli. Considering turbidity as the most important criterion, the indicator for acceptability of turbidity in terms of health (Turbidity
