Microplastics are regarded as an emerging threat to water and otherenvironments. The increasing use of plastics in agricultural cultivation has led tohigher risks and more dangerous pollution of agricultural water. However,microplastics in agricultural water in Vietnam have neither been studied nordocumented in any publication. To provide initial scientific evidence ofmicroplastics in agricultural water in the country, we conducted a case study in KimSon district, Ninh Binh province. Water samples were randomly collected from 15representative sites within the canal systems of the study area. Our study resultsindicated that the agricultural water in the study area was polluted by microplastics,which vary considerably in all size, shape, and color aspects. The averageconcentration of microplastics found in the examined water was 491 ± 259particles/m³, with detected microplastic sizes ranging from 302 to 4,593 µm. Amongthese, microplastics sized between 300 and 1,000 µm were the most dominant,accounting for 61.8% of the total detected microplastics. In terms of shape, 94.5%of the detected microplastics were fibers, present at all 15 study sites, while only5.5% were fragments, found at just seven sites. The microplastics were also highlydiverse in color, with white being the most common and densely present in everyanalyzed water sample. The results of the present study provide the first scientificevidence of microplastic occurrence in agricultural water within the study area andcan serve as a crucial basis for comprehensive research and effective managementof plastic products in the future.Microplastics are regarded as an emerging threat to water and otherenvironments. The increasing use of plastics in agricultural cultivation has led tohigher risks and more dangerous pollution of agricultural water. However,microplastics in agricultural water in Vietnam have neither been studied nordocumented in any publication. To provide initial scientific evidence ofmicroplastics in agricultural water in the country, we conducted a case study in KimSon district, Ninh Binh province. Water samples were randomly collected from 15representative sites within the canal systems of the study area. Our study resultsindicated that the agricultural water in the study area was polluted by microplastics,which vary considerably in all size, shape, and color aspects. The averageconcentration of microplastics found in the examined water was 491 ± 259particles/m³, with detected microplastic sizes ranging from 302 to 4,593 µm. Amongthese, microplastics sized between 300 and 1,000 µm were the most dominant,accounting for 61.8% of the total detected microplastics. In terms of shape, 94.5%of the detected microplastics were fibers, present at all 15 study sites, while only5.5% were fragments, found at just seven sites. The microplastics were also highlydiverse in color, with white being the most common and densely present in everyanalyzed water sample. The results of the present study provide the first scientificevidence of microplastic occurrence in agricultural water within the study area andcan serve as a crucial basis for comprehensive research and effective managementof plastic products in the future.