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Table 2 Level of fluoride (ppm) in water by type of source

From: High fluoride water in Bondo-Rarieda area of Siaya County, Kenya: a hydro-geological implication on public health in the Lake Victoria Basin

Source Borehole Dams Lake Ponds River Yala Springs Streams Tap water Overall
Mean [F] ppm 0.74±0.48 0.96±0.79 0.41±0.28 1.41±0.82 0.41±0.423 1.25±0.43 0.95±0.41 0.54±0.77 0.86±0.67
Highest 2.09 5.18 0.94 2.43 1.09 1.81 1.85 2.92 5.18
>3.0 ppm - 1 (2.1%) - - - - - - 1 (0.8%)
1.5-2.9 ppm 1 (4.3%) 6 (12.8%) - 3 (50.0%) - 1 (16.7%) 2 (9.1%) 1 (9.1%) 14 (10.9%)
1.0-1.4 ppm 4 (17.4%) 6 (12.8%) - - 1 (20.0%) 3 (50.0%) 7 (31.8%) - 21 (16.4%)
0.5-0.9 ppm 11 (47.8%) 26 (55.3%) 3 (37.3%) 2 (33.3%) - 2 (33.3%) 9 (40.9%) 3 (27.3%) 56 (43.8%)
<0.4 ppm 7 (30.4%) 8 (17.0%) 5 (62.5%) 1 (16.7%) 4 (80.0%) - 4 (18.2%) 7 (63.6%) 36 (28.1%)
Lowest 0.17 0.22 0.01 0.37 0.11 0.96 0.34 0.14 0.01
Sample size (n) 23 47 8 6 5 6 22 11 128