Table 2.

Mean fluoride levels in ppm (± SD) in various drinking water sources in Nigeria

Geopolitical Zone	Drinking Water Source
	Water-Works	River/ Streams	Shallow Wells	Deep Wells	Boreholes	Ponds	Others
N. Central + FCT	0.70±0.62	0.41±0.31	0.96±0.81	0.67±1.28	0.68±0.75	0.44±0.24	0.36±0.23
N. East	0.55±0.46	0.29±0.28	0.33±0.22	0.36±0.30	0.62±0.67	0.38±0.09	0.11±0.05
N. West	0.32±0.29	0.31±0.16	0.26±0.22	0.33±0.28	0.34±0.24	0.31±0.21	0.01±0.00
S. South	0.22±0.12	0.22±0.34	0.28±0.76	0.24±0.38	0.53±1.10	0.10±0.03	0.22±0.26
S. East	0.44±0.66	0.23±0.20	0.21±0.08	0.18±0.05	0.38±0.42	032±0.37	0.31±0.37
S. West	0.16±0.10	0.17±0.11	0.26±0.19	0.33±0.35	0.63±1.05	1.72±3.07	0.17±0.15
Total	0.39±0.44	0.27±0.26	0.39±0.60	0.40±0.67	0.50±0.75	0.50±1.16	0.24±0.28