This document discusses the use of treated wastewater in concrete. It begins by providing background on wastewater treatment in Kuwait and previous research on using treated wastewater in concrete mixing and curing. The document then details the methodology used, which included designing concrete mixes with 100% cement, 80% cement 20% fly ash, and 80% cement 20% GGBS. Cubes were cast and tested at 7, 14, and 28 days. The results showed compressive strengths over 28 days were similar or higher when using treated wastewater compared to potable water. The conclusion is that treated wastewater can be used in concrete with similar results to potable water, helping address water scarcity issues.