Table 4

Quantity ingested, exposed population and the estimated risk of infection at the point-of-use water sources

Sources of contaminationMicroorganism (mean)Quantity ingested (mL)Exposed populationNo. of exposure to single-dose per yearDose (d)Probability of infection P1(d)Annual probability of infection P1(A)(d)
River water E. coli (0.5) 3,360 132 365 1.3 3.3 × 10−6 1.2 × 10−3 
Spring well E. coli (1.0) 3,360 284 365 2.7 6.9 × 10−6 2.5 x10−3 
Sources of contaminationMicroorganism (mean)Quantity ingested (mL)Exposed populationNo. of exposure to single-dose per yearDose (d)Probability of infection P1(d)Annual probability of infection P1(A)(d)
River water E. coli (0.5) 3,360 132 365 1.3 3.3 × 10−6 1.2 × 10−3 
Spring well E. coli (1.0) 3,360 284 365 2.7 6.9 × 10−6 2.5 x10−3 
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