Water is one of the most important precious natural resources required essentially for the survival and health of living organisms. Tungabhadra River is an important tributary of Krishna. It has a drainage area of 71,417 sq km out of which 57,671 sq. km area lies in the state of Karnataka. The study was conducted to measure its
various physico-chemical and bacteriological parameters including levels of algal community. Pollution in water bodies may indicate the environment of algal
nutrients in water. They may also function as indicators of pollution. The present investigation is an attempt to know the pollution load through algal indicators in
Tungabhadra river of Karnataka near Harihar town.