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. 2021 Jul 20;18(14):7703. doi: 10.3390/ijerph18147703

Table 3.

Statistical analysis of chemical composition of groundwater.

Indexes	Dry Season					Wet Season
Indexes	Min	Max	Mean	SD	% of SES	Min	Max	Mean	SD	% of SES
pH	7.01	8.13	7.57	0.25	0.00	7.04	8.62	7.69	0.33	3.57
TDS	248	1040	527.75	196.03	3.57	165	993	495.29	194.41	0.00
TH	88	711	373.64	153.45	35.71	70	633	344.32	147.37	32.14
Ca²⁺	22.3	194	87.84	39.44	0.00	18.6	170	80.07	35.88	0.00
Na⁺	19.1	118	49.58	21.69	0.00	10.2	110	46.65	21.62	0.00
Mg²⁺	7.89	56.6	37.48	13.98	0.00	5.74	56.2	35.04	14.58	0.00
K⁺	0.46	3.34	1.95	0.63	0.00	0.44	3.11	1.86	0.56	0.00
Fe³⁺	0.02	16	0.19	0.41	14.29	0.01	0.15	0.02	0.03	0.00
${HCO}_{3}^{-}$	200	587	327.89	90.83	82.14	110	563	318.86	96.26	82.14
SO₄²⁻	35.9	162	79.88	30.58	0.00	30.9	165	77.41	31.91	0.00
Cl⁻	12.1	154	76.17	47.64	0.00	7.34	155	69.67	46.44	0.00
NO₃-N	0.258	22.6	6.36	6.21	3.57	0.018	20.3	5.16	5.77	3.57
F⁻	0.135	0.753	0.32	0.10	0.00	0.087	0.795	0.34	0.12	0.00
NO₂-N	0.0003	0.0003	0.0003	0.00	0.00	0.0003	0.0142	0.0022	0.00	0.00

Note: The unit of water quality parameters are mg/L, except pH, SD, standard deviation, % of SES, % of sample exceeding standard.