Water is essential for all life. The study was conducted to assess surface water quality in in-field water bodies of Ben Tre province in 2020. Surface water samples were taken in the dry and rainy seasons at nine representative sites (VT1 to VT9). Temperature, pH, turbidity, salinity, dissolved oxygen (DO), suspended solids (TSS), biochemical oxygen demand (BOD), chemical oxygen (COD), ammonium (N-NH₄⁺), nitrate (N-NO₃^-), orthophosphate (P-PO₄^3-), iron (Fe) and Coliform were used for water quality assessment by comparing with the national technical regulation on surface water quality QCVN 08-MT:2015/BTNMT, column B1. The results showed that surface water was polluted by TSS, BOD, and Fe. The highest salinity was at 7.9‰ in the dry season. TSS and BOD were high in the rainy season while DO and Fe were high in the dry season. Temperature, pH, COD, N-NH₄⁺, N-NO₃^-, P-PO₄^3- and Coliform were within the limits of QCVN 08-MT:2015/BTNMT, column B1. However, the risk of eutrophication is still existed due to the presence of nutrients. The more pollution of water source in the dry season could limit the water use. Sources of water pollution could be from agricultural production and human activities. Future study should focus on investigating concrete water pollution sources and appropriate measures should be taken to improve the current water quality problems.