The objective of this study was to examine the chemical properties of CBM product water at discharge sites and in associated impoundments across the Qinshui Basin. Results show that TDS, pH and Total Alkalinity of product water for three areas increased in impoundments compared with discharge sites. The CBM product water exhibited relatively less change in ion and element concentrations in Zhengzhuang impoundments, however, the dissolved F concentration increased in Shizhuang impoundments. Due to cation exchange and precipitation, concentrations of HCO3 -, Ca2+ and Mg2+ of product water increased considerably but concentration of K++Na+ and CO3 2- of product water decreased considerably in impoundment waters of Shizhuang and Guxian areas, concentration of Cl-, SO4 2-, NH4 +and dissolved Fe, Zn and Mn of product water showed less change in impoundment water of three areas. Dissolved As, Cu, Pb and Cd concentrations were non-detectable in both CBM discharge site and associated pond waters of the three areas.