Parameter	Unit	Long rainy season					Long dry season					WHO standards (2011)
Parameter	Unit	Min	Max	Avg	σ	CV (%)	Min	Max	Avg	σ	CV (%)	WHO standards (2011)
As	(mg/L)	0.00	0.01	0.00	0.00	-	0.00	0.10	0.01	0.02	200	0.01
Ba	(mg/L)	0.00	0.18	0.03	0.04	133.33	0.00	0.06	0.02	0.02	100	0.7
B	(mg/L)	0.02	0.56	0.06	0.13	216.67	0.02	0.21	0.04	0.06	150	0.7
Cr	(mg/L)	0.00	0.03	0.01	0.01	100	0.01	0.05	0.01	0.01	100	-
Co	(mg/L)	0.00	0.01	0.00	0.00	-	0.00	0.01	0.00	0.00	-	-
Cu	(mg/L)	0.00	0.01	0.00	0.00	-	0.00	0.13	0.01	0.03	300	2
Pb	(mg/L)	0.00	0.33	0.05	0.09	180	0.00	0.17	0.04	0.05	125	0.01
Mn	(mg/L)	0.00	1.64	0.31	0.46	148.39	0.01	1.59	0.25	0.38	152	<0.5
Ni	(mg/L)	0.00	0.03	0.01	0.01	100	0.00	0.06	0.01	0.01	100	0.07
Sr	(mg/L)	0.06	1.29	0.28	0.31	110.71	0.03	1.37	0.26	0.31	119.23	-
Zn	(mg/L)	0.02	0.92	0.13	0.21	161.54	0.01	10.61	0.67	2.56	382.09	3
Al	(mg/L)	0.03	4.03	0.47	0.95	202.13	0.03	19.95	1.87	4.90	262.03	0.2
Fe	(mg/L)	0.10	8.94	1.30	2.17	166.92	0.10	46.40	4.66	11.55	246.78	<0.3