A total of 40 groundwater samples collected from deep tube well and bore well from Nagaon
district, Assam, India were analysed for fluoride contamination, besides water quality
parameters such as pH, calcium, magnesium, sodium, potassium, and major anions such as
chloride, sulphate, nitrate etc. The concentration of fluoride in the water samples ranged
between 0.03 and 5.68 mg/L and revealed that 42.5% of water samples contain fluoride above
the maximum permissible limit. The R-squared values for the correlation of fluoride with calcium
and magnesium showed a poor positive correlation, but with sodium and potassium a strong
positive correlation was observed.
