Wastewater is transitioning from being viewed as a waste to being utilized as a resource in the production of reclaimed water. Reclaimed water, obtained through waste stabilization pond treatment technologies, has the potential to offset potable water needs for irrigation purposes as well as fertilizers for crop growth. In developing countries, where waste stabilization ponds are widely used, a major issue is the lack of maintenance which can lead to considerable amounts of sludge piled at the bottom of the pond. This sludge accumulation reduces the treatment capacity of the waste stabilization pond and possibly, the treatment efficiency which is vital for reuse purposes. In cases for which desludging of the pond is a challenge, retrofitting the pond inlet can offer an alternative to improve pond hydraulic performance. In this study, two inlet retrofit geometries are investigated in a waste stabilization pond with significant sludge accumulation using computational fluid dynamics. It is seen that retrofitting the pond with a three-way pipe inlet increases the mean residence time of the pond from 21.9 days to 25 days over a single pipe inlet while significantly reducing the strength of short-circuiting.