The ecology of Ban Ganga stream was investigated to study the impact of anthropogenic activities during the study period, Nov., 2013 to Apr., 2014. The study involved the assessment of various physico-chemical parameters viz. air temperature, water temperature, pH, FCO_2, DO, HCO₃^-, Ca²⁺, Mg²⁺, Cl^-, nitrates, phosphates and sulphates whereas the biotic components included the qualitative analysis of planktonic and macrobenthic invertebrate fauna. Zooplanktonic fauna was represented by groups’ viz. Protozoa, Ciliata, Rotifera, Cladocera and Copepoda. Among macrobenthic invertebrate fauna, Annelida, Arthropoda and Mollusca were the representative classes.