Landfill leachate is a great danger to the environment. In order to answer the questions of a healthy environment, the leachates produced at the Niamey 2000 landfill site were characterized. Samples were taken at various points around 1 and 4 o'clock in the landfill. The parameters determined are: temperature, pH, electrical conductivity, dissolved oxygen, suspended solids, turbidity, cations (sodium, potassium, calcium, magnesium and ammonium), anions (sulfate, chloride, nitrate) , ortho-phosphates and bicarbonate), metallic trace elements (iron, copper, chromium, cadmium, nickel, cobalt and zinc) by a Hach DR 3800 spectrophotometer, BOD5 and COD. The results of the analyzes show that the leachates produced at the Niamey 2000 landfill are basic (minimum pH 7.6), highly charged with suspended matter (590mg / L), very turbid (297NTU) and highly polluted (dissolved oxygen less than 3mg / L). The mineral pollution is characterized by a high average electrical conductivity of 2441.5 μS / cm, a high concentration of chlorine (1276.5 mg / L) and orthophosphates (3.31 mg / L). The organic load is translated by an average COD of 2248mgO2 / L and an average BOD5 of 530mgO2 / L. These leachates are characterized by high concentrations of iron, zinc, cadmium and copper which are respectively in mg / L of 9.26; 8.75; 0.19 and 2.3. Elements such as nickel and chromium are present at levels below the limits set by the Nigerian release standard.
