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The paved areas in nonpoint source are highly polluted landuses because of highimperviousness and pollutant mass emissions, such as sand, cereals, and dust from vehicleactivities. Most of them in highways are collected by cleaning trucks or discharged to theadjacent soil and water system through the drain ditch in stormwater. Therefore, it is necessaryto investigate the relationship between water concentration and total pollutant loadings fromthe paved areas.From the experiment, CODcr concentration of the cleaning wastewater was 17 times greaterthan that of the stormwater runoff. Also, concentrations of heavy metals (Cu, Fe, Zn) were 1.3 to1.5 times higher when compared to the stormwater runoff. While total discharged loadings wasinsignificant in the cleaning wastewater. In conclusion, these results provide some evidence thatthe stormwater runoff may be managed carefully to the aspect of total pollutant loadings andthe cleaning wastewater may be handled cautiously with the pollutant concentrations inhighways.