Concrete constructions located in close proximity to a water environment, whether they are directly or indirectly exposed, experience both physical and chemical transformations. The ingress of water into the permeable concrete prompts the need for implementing appropriate modifications to the visible concrete. Cow dung ash has pozzolanic properties that have the potential to provide high-quality concrete constructions. The primary objective of this research is to investigate the properties of M30 grade concrete mix, namely regular concrete and concrete treated with CDA. The preparation of concrete was conducted by including CDA as a partial substitute for OPC at a rate of 15%.Following a curing period of 28 days, the specimens were further subjected to immersion in fresh water for durations of 56, 90, 180, and 365 days. The results indicated that there was a considerable improvement in pH levels, compressive strength, split tensile strength, and overall durability. X-ray diffraction analyses were conducted to determine the crystalline structures, while Field Emission Scanning Electron Microscope investigations were undertaken to examine the structural morphology of the concrete specimens. Both investigations demonstrated the existence of a higher quantity of calcium silicate hydrate and cementitious products in concrete that was treated with CDA. A lower bacterial density was detected on concrete surfaces that were changed with CDA in comparison to those that were not modified (referred to as NC).