Heavy metals accumulation and spatial distribution in long term wastewater irrigated soils

•Effects of irrigation with sewage effluents and contaminated areas were assessed.•Lead, Cu, and Ni have high affinity for retention on rich OM-soil layer.•The high mobility of Cd signifies a risk on the groundwater.•The accumulations of Pb and Cu in on topsoil are considered at hazard levels.•The remediation and alternative management strategies are required.