Water quality criteria for livestock watering – a comparison among different regulations

Resumo

This review presents water quality criteria for livestock adopted by different countries/states and discusses how those limit values are established. The method used was a literature data survey, available in the electronic pages of regulatory agencies of different countries or states. Livestock water quality criteria for chemical substances adopted by different countries/states, includingBrazil(CONAMA 357 e 396), were compared. Information about the main factors can influence the derivation of livestock water quality criteria were highlighted. The analysis of the Brazilian surface water regulation, which is based on multiple uses, indicated that some standards are not appropriate for livestock use. Great variation was observed for the choice of priority substances and the water quality criteria among the different countries/states were analyzed, confirming the need for the establishment of criteria for each country, considering the use and importance of substances and specific exposure scenarios. From the compiled date it is possible to observe that water criteria for livestock have not been yet established for several chemicals, suggesting that more studies are needed inBrazil.