Long-term use of treated wastewaters for irrigation could add some compounds and/or ions to the soils which might alter soil physical, hydraulic and mechanical properties. Soil hydraulic properties, water characteristic curve and hydraulic conductivity, are greatly affected by land use management and irrigation water quality. Soil water repellency and wettability are important in soil-water and plant relations. Soil mechanical strength is closely linked with plant growth as well. This study was conducted to investigate the effect of treated wastewater of Foolade-Mobarake Steel Company on infiltration, soil hydraulic and mechanical properties and available water of soils in the company green space. Experimental design was a complete randomized blocks. Thirty five sampling points were selected based on the irrigation water (well water and treated wastewater) and commencement of irrigation (3, 7 and 19 years ago). Non-irrigated locations were also considered as control (i.e. virgin soil). Unsaturated water infiltration into the soil was measured using a tension infiltrometer and the infiltration data was inversely modeled and analyzed using Wooding’s analytical method and numerical solution in DISC software. Soil water repellency was characterized using the intrinsic sorptivity method. Soil shear strength and penetration resistance were measured using an in situ shear box and pocket penetrometer, respectively. Soil water characteristic curve was measured using undisturbed soil samples in the laboratory. Wastewater use reduced soil pH and increased soil salinity except for the treatment with 19-years irrigation. The wastewater increased soil organic matter content. Irrigation with wastewater decreased saturated and unsaturated hydraulic conductivities at all matric suctions probably due to suspended particles and hydrophobic materials which blocked the conducting pores. The wastewater decreased soil infiltrability, steady-state flux and water sorptivity due to negative impact of water-repellent agents on water sorptivity of soil particles. Long-term (19 years) application of wastewater resulted in greater soil water repellency index. Soil shear strength parameters were not significantly affected by the irrigation water treatments because of the dominant effect of soil fractions and microstructure on shear strength. However, soil penetration resistance (i.e. soil hardness) at both dry and wet conditions significantly increased upon wastewater application. The van Genuchten parameters including n , ? and ? s were not significantly influenced by the wastewater or well water when compared to the control, however, ? s was significantly increased after long-term application of wastewater. Irrigation with both wastewater and well water decreased soil bulk density, and increased capillary pores and maximum water-holding capacity, and as a consequence the soil available water and physical quality were increased. Overall treated wastewater of Foolade-Mobarake Steel Company could affect soil hydraulic and mechanical properties and water repellency similar to the well water in the region. Therefore, treated wastewater in the region could be considered suitable for irrigation of done. Keywords: Soil hydraulic properties, Tension infiltrometer, Shear strength, In situ shear box, Pocket penetrometer, Soil water characteristic curve, Water repellency, Soil available water