Table 1

S. No	Location	No. of samples	Season	Minimum	Maximum	Mean	SD	No. of samples with Fluoride level (mg/l)
S. No	Location	No. of samples	Season	Minimum	Maximum	Mean	SD	< 0.50	0.51 – 1.5	> 1.5
1.	Rameswaram temple	22	Summer	0.34	1.46	0.90	0.37	04	18	00
1.	Rameswaram temple	22	Winter	0.06	1.56	0.87	0.37	03	17	02
2.	R – D tract	71	Summer	WDL	3.08	1.08	0.74	18	30	20
2.	R – D tract	40	Winter	WDL	1.92	0.45	0.55	26	12	02
3.	R – U Northern tract	61	Summer	WDL	2.96	1.23	0.65	07	39	15
3.	R – U Northern tract	30	Winter	WDL	2.12	0.92	0.53	07	21	02
4.	R – U Southern tract	51	Summer	WDL	2.50	1.06	0.60	12	27	12
4.	R – U Southern tract	35	Winter	WDL	2.02	0.79	0.56	12	20	03
5.	Residential area	50	SW	WDL	1.84	0.56	0.40	24	24	02
		21	NE	0.16	1.84	0.88	0.46	04	05	03
		16	NW	WDL	1.64	0.64	0.54	08	06	02
	Total	419						125	231	63

WDL – Within Detectable Level; SD – Standard Deviation

Table 1: Summary of Fluoride level in the groundwater samples of the study area