.Preamble, importance and function of water, history. 2.Hydrobiology. 3.Substances endangering quality of waters, changes of water quality, offending substances. 4.Substances endangering quality of waters, municipal wastewater, sewage water, rain water, industry water. 5.Rain water, pollution, acid rain, rain water pollution effect to water quality. 6.Ground water, pollution, migration and self purification, diffusion of pollution. 7.Ground water, protection of ground water, hydro geological exploration, measures to ground water protection. 8.Surface water, purity and pollution, self purification, oxygen balance in rivers. 9.Surface water, oxygen regime in rivers, mixing, quality of water and classification of water, wastewater disposal to surface water. 10.Mathematical modeling of water quality in rivers. 11.Mathematical modeling of water quality in reservoirs. 12.Emergency state in water quality, apportionment of accident, course of accident, solution of accident 13.Protection of water in Czech Republic.