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Dynamic equilibrium in the aquatic ecological factors was being disturbed by anthropogenic activities, in stream sand mining is one of them. River Sone at Koelwar near Bihta, Bihar, India, is heavily intervened for in stream sand mining. This study was to assess the impact of sand mining on physicochemical parameters of Sone water. For chemical analysis samples were collected in three seasons, pre monsoon, monsoon and post monsoon on the basis of mining load at three sites, 1st Reference site - upstream where sand mining doesn't take place, 2nd sand mining site - where intensive sand mining take place, and 3rd downstream of sand mining site. Measured mean value of cations TZ+ (52.96 mg/L) predominate over anions TZ- (29.35 mg/L) in Sone water. Mean hike in silica particles (33.94 mg/L) and turbidity (31.96 mg/L) were noted at sand mining sites which augments fluvial load and also attenuate transmission of sun rays in to water by reflecting most of the incident rays when it strikes on nano particles dispersed in turbid water and decreases primary productivity. Concentration of DO was found higher at some sampling stations. All other parameters were within prescribed limit. [ABSTRACT FROM AUTHOR]