The Groundwater Geochemistry and the Human Health Risk Assessment of Drinking Water in an Area with a High Prevalence of Chronic Kidney Disease of Unknown Etiology (CKDu), Sri Lanka

Table 5

Water quality index (WQI) values and the relative description of drinking water samples collected from CKDu prevalent and non-CKDu prevalent areas in Sri Lanka.

Sample ID	CKDu prevalent area (Girandurukotte GND)			Non-CKDu prevalent area (Dambethalawa GND)
	WQI value	Description	Grade	WQI value	Description	Grade
1	68.65	Poor	C	38.62	Good	B
2	78.65	Very poor	D	54.23	Poor	C
3	84.52	Very poor	D	42.36	Good	B
4	86.23	Very poor	D	21.56	Excellent	A
5	42.53	Good	B	36.52	Good	B
6	78.69	Very poor	D	45.23	Good	B
7	87.96	Very poor	D	75.23	Very poor	D
8	89.65	Very poor	D	32.65	Good	B
9	72.65	Poor	C	26.53	Good	B
10	68.89	Poor	C	42.36	Good	B
11	68.92	Poor	C	35.62	Good	B
12	56.98	Poor	C	48.63	Good	B
13	78.62	Very poor	D	32.52	Good	B
14	65.92	Poor	C	45.32	Good	B
15	84.62	Very poor	D	52.36	Poor	C
16	78.92	Very poor	D	56.32	Poor	C
17	71.56	Poor	C	63.52	Poor	C
18	70.23	Poor	C	46.35	Good	B
19	81.23	Very poor	D	51.25	Poor	C
20	69.35	Poor	C	43.23	Good	B
21	59.62	Poor	C	65.32	Poor	C
22	60.23	Poor	C	45.68	Good	B
23	78.45	Very poor	D	15.62	Excellent	A
24	45.62	Good	B	52.36	Poor	C
25	76.32	Very poor	D	44.52	Good	B
26	45.96	Good	B	32.52	Good	B
27	96.32	Very poor	D	25.47	Good	B
28	78.52	Very poor	D	27.82	Good	B
29	60.52	Poor	C	32.56	Good	B
30	59.48	Poor	C	48.52	Good	B
Mean	71.53	Poor	C	42.70	Good	B
Minimum	42.53			15.62
Maximum	96.32			75.23
SD	13.35			13.52

“Poor” indicates the status of the WQI in the CKDu prevalent area. “C” indicates the grade obtained for the WQI in the CKDu prevalent area. “Good” indicates the status of the WQI in the non-CKDu prevalent area. “B” indicates the grade obtained for the WQI in the non-CKDu prevalent area. These are based on Table 2.