This article deals with new Czech Standard 75 7221 Water quality – Classification of surface water quality  and replaces the previous 19 years old standard . It was necessary to take into account actual demands of the surface water protection from two points of view: pollution indicator selection and current environmental quality standards. The range of pollution indicators and limit values of water classification were revised.
The aim of this study is a summary of problems dealing with microbial pollution of flowing surface waters in the Czech Republic. Limits of counts of indicator microorganisms in current legislation and technical standards are presented, together with characteristics of the mostly used indicators of faecal pollution and methods of their detection.
The research team, consisting of experts from the TGM Water Research Institute, p. r. i. (RNDr. Dana Baudišová, Ph.D., Ing. Tomáš Mičaník, Ing. Eduard Hanslík, Ph.D., Mgr. Denisa Němejcová and others), started from February 2016 work on the research project “The quality and evaluation of surface waters”.
The aim of this study is introduction and practice of chromogenic medium CCA that is prescribed in the amendment of EN ISO 9308-1 standard for detection of Escherichia coli and coliform bacteria in waters with low bacteria background flora.