Four water samples from the irrigated canal (n = 1), deep well (n = 1) and paddy fields (n = 2) were collected in May and June, 2013.A sample from the irrigated canal was collected from Khlong Saen Saep at Wat 46 Pai Dum Charoen Sook, Bang Nam Priao district, Chachoengsao province on May 7, 2013.