Surface and ground water monitoring was conducted on the areas where cereals, maize, rape and sugar beet were dominant crops. Three groups of active substances such as triazine, chloroacetamide and phenoxy acids derivatives were chosen to assess the influence of the changes in the registration of plant protection product on the frequency and level of herbicide residues in water. The residues of herbicide active substances were found both in surface and ground water. In 2002, the highest level of residues in surface water, were found to be phenoxy acids (2,4-D, MCPA, dicamba) and triazines (atrazine, simazine), amounted to 10-3 mg/l. Chloroacetamides residues concentration was lower, and amounted to 10-5–10-4 mg/l. Whereas, in 2012 neither atrazine, nor simazine residues were detected in the surface water. However, in the ground water these substances are still present, but their concentration has significantly decreased (10-5–10-4 mg/l). It was also observed, that the concentration of fenoxy acids during the whole decade has not changed significantly in the ground water, and is maintained on a constant level of 10-4 mg/l. Percentage of the samples in which herbicide residues were detected, varies between year 2002 till 2006 from 8.5 to 4.8%, and now it is maintained on the same level. Noticeable decline in the herbicide residues concentrations in the ground and surface water is observed during the last five years, which is a result of the changes in the range of herbicides used.
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