Tnis study was undertaken to provide a drinking water quality on the basis of physicochemical properties. In this study, the 25 samples of supply waters of the Taejon area were samples twice (February and August in 1999). Hydrochemistry of the supply water belongs to the Ca2+-HCO₃- type, whereas the supply water was characterized by the relatively significant enrichment of Ca2+, Na+, K+, Cl- ions and heavy metals compared to the original water from the Daecheong lake. Generally, the supply water has a mean values for 10.7℃ of temperature, 6.86 of pH, -12 mV of Eh, 88 μS/cm of EC and 70.379 mg/l of TDS in February, whereas the waters of the same sites in August are a slightly high temperature (26.1℃), TDS (78.069 mg/l) and extremely high EC (442 μS/cm) value. These values are similar with physichemical properties of the original lake water depending on the seasonal differences. Results of speciation calculation indicate that potentially toxic ions might exist mainly in the forms of free metal (Cu2+ or Zn2+) and a small amount of CO₃2- and OH- in the supply water. The water seemed to be in equilibrium with kaolinitic field of the normal stability diagrams for the natural water. Based on enrichment parameter of the supply water normalized by origical lake water composition, the average value of those parameter can be calculated with nearly 1.00, but the those values for Cu+Zn possible source of decrepit pipe lines are 126.75 in February and 115.63 in August samples. The parameter values varied with sampling sites, however, do not exceed by chemistry of drinking water standard. Solid compounds remaine don the memberane filter papers after filtration are adhered to pale yellow or yellowish brown colored disoolved solids and precipitates, which are coated by 0.02 to 0.35 mm thick per 500 ml with colloidal particles of about 1 to 2 μm size. The praticles are mainly Fe-Cu-Zn compounds and partly detected to Mn and Pb.
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