A good correlation between the contamination data and the temperature or precipitation was obtained by applying PCR algorithm with coefficient correlation of 0.80 and 0.81, respectively.This model can be used as a predictive model. The equation were: y = 0.73166 (Ta) + 4.5455, r2= 0.855, y = 0.6622 (Precipitation) + 7.6824, r2= 0.80159.