Table 4 Determination of the proportion of the population that would be affected by above-optimum level of fluoride in household water in the Bondo-Rarieda Area, Siaya County, Kenya
Type of water source | Percentage of the population that use each water source type, P (i) * | Percentage number of water sources with excessive fluoride, P (iF) | Percentage of population that is exposed to excess F in water, P (F) = P (i) P (iF) |
|---|---|---|---|
Borehole & shallow wells | 9.3 | 43.5 | 4.0 |
Dams, open pans and ponds | 30.2 | 66.1 | 20.0 |
Lake | 37.4 | 12.5 | 4.7 |
River Yala | 0.0 | 20 | 0.0 |
Streams and Springs | 8.7 | 74.6 | 6.5 |
Tap Water | 8.6 | 9.2 | 0.8 |
Overall | 27.3 | ∑ P (i) P (iF) = 36.0 |