There are very few studies evaluating the heavy metals and nitrate contents in their soils
and groundwater in the north provinces and cities in Iran although majority of rice, tea and other crops
comes from these location. Dangerous contents of Cadmium and Lead could been found in recent
years in Mazandaran and Gilan agricultural products due to contaminated source tapped to address
population and over fertilization with chemical fertilizers and high rain falling.A descriptive – analytical
and cross-sectional study was conducted for determination of Lead and Cadmium as heavy metals and
nitrate in 100 samples of ground water and soil of 10 different sites in Talesh in the North of Iran in three
consequent months in (winter and spring;summer, 2013). The results revealed that all samples in
panjahaft had lead and nitrate contents above maximum level 0.01 mg/L and 50 mg/L which is
recommended by WHO (WHO, 2007; US/EPA, 2013) and Lead was present in detectable amounts in all
samples while cadmium content in all samples was lower than permissible levels of WHO 0.003 mg/L. In
this study, among 100 groundwater samples, 6 samples (with mean Lead content of 0.006 mg/L, about
0.00 mg/L Cadmium content and 26.14 mg/L nitrate content ) in winter were classified in “Excellent”
class for drinking, while 53 samples ( mostly in summer season had nitrate content ? 50 mg/L , but lead
content ?0.01 mg/Lit) , and 41 samples were in “Poor” class due to had Lead and Nitrate more than
permissible levels.