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Table 1

Fluoride concentrations in drinking water samples collected across Tanna Island between 2017 and 2020 by source

NSourceMedian (mg/L)Range (mg/L)Number of samples exceeding WHO guideline value of 1.5 mg/L
30 Groundwater 3.30 0.38–4.60a 20 
21 Spring 0.51 0.08–1.72b 
13 Roof-collected rainwater 0.53 <0.05–4.00b 
Surface water 0.58 0.11–1.10b 
69 Total 1.54 <0.05–4.6 23 
NSourceMedian (mg/L)Range (mg/L)Number of samples exceeding WHO guideline value of 1.5 mg/L
30 Groundwater 3.30 0.38–4.60a 20 
21 Spring 0.51 0.08–1.72b 
13 Roof-collected rainwater 0.53 <0.05–4.00b 
Surface water 0.58 0.11–1.10b 
69 Total 1.54 <0.05–4.6 23 

Superscripts a and b denote statistical difference between these sets of data.

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