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Peat water in the City of Palangka Raya has a high degree of acidity, which is indicated by a pH level of 4.5. Acidic water will affect the physical and mechanical properties of concrete and make the concrete corrosive. This is the background of this research. This research was conducted to determine the effect of peat water on the concrete quality of the original plan of 300 kg/cm2. Analysis was carried out on soaking concrete on peat water for 30 days, 60 days and 90 days. As a comparison, water from the Kahayan river is used. The test results showed that the concrete soaked in peat water 30 days, 60 days and 90 days showed an average compressive strength of 223.98 kg/cm2, 227.75 kg/cm2 and 209.65 kg/cm2. Whereas the concrete which was immersed with Kahayan river water showed an average compressive strength of 234.54 kg/cm2, 254.90 kg/cm2, and 215.68 kg/cm2. It can be concluded that the concrete soaked in peat water shows a decrease in the strength of concrete as much as 26.5% while Kahayan river water by 21.6%.