This study aims to assess wastewater quality in Wadi Al-Mawaheb Dhamar city, and the extent to which it used for irrigation and its comparison with standards of the food and agriculture organization (FAO), and compare it with some old data, and also assessing its impact on the soils. The results of the study showed that the wastewater treatment plant for the city of Dhamar is unable to treat the required and that it is only a collection point for wastewater flowing from the city of Dhamar collecting wastewater and allowing it to flow to the Valley of Talents, and through the results of the analysis of wastewater inlet and outlet of The station, the analysis showed that there is no significant difference to the results of the analysis, which indicates that the wastewater plant is not working on the required treatment, due to weak capacity of the station, and also then compared it with results of the analysis of 2005, 2009 and 2012, it found that there is a big difference in the results of the analysis. As well as the US salinity diagram illustrates that of the treated wastewater sample fall in the field of C4-S2, indicating high salinity and low sodium water, which can be used for irrigation on almost all types of soil without danger of exchangeable sodium. As for the results of the analysis of the soil irrigated with wastewater used, its effect was low on soil and it does not appear only after some time.