Geoaccumulation index (Igeo) values were interpreted as: Igeo≤ 0 – practically uncontaminated; 0 ≤ Igeo≤ 1 – uncontaminated to moderately contaminated; 1 ≤ Igeo≤ 2 – moderately contaminated; 2 ≤ Igeo≤ 3 –moderately to heavily contaminated; 3 ≤ Igeo≤ 4 – heavily contaminated; 4 ≤ Igeo≤ 5 – heavily to extremely contaminated; and 5 < Igeo– extremely contaminated.