iarjimphIARJIMPHIARJIMPH2709-331Xhttps://doi.org/10.47310/iarjimph.2022.v03i02.009Bacteriology of Water, Air and Milk: Various Tests and their InterpretationsVineetBhardwajAssemSirkeckKamalKantKaliaIn this article we discussed about the Bacteriology of Water, Milk and Air. Water is the main constituent of the body and is consequently a necessary article of diet. The bacteriological examination of water constitutes an important part of the control of water, but a final judgment of the portability of water should never be given from the bacteriological examination alone; in all cases, detailed information of the topography of the drainage area should be available. It is also important to note that a single bacteriological investigation, unless quite unsatisfactory, is of very limited value. Milk is a good bacteriological medium, and it is, therefore, essential that the standard of milk for human consumption be rigorously controlled. Lactobacilli may also be present and continue the process after the initial acidification by the streptococci. It is important to examine milk for pathogens to ensure that it is safe to be consumed by man. Milk is further used for obtaining many milk products like cheese, cream, butter and ice cream. The load of microorganisms present in the air depends on whether the air is indoors or outdoors. The number of bacteria at any time is dependent on many factors, the most important of which are the number of persons present, the amount of their body movements, and the amount of disturbance of their clothing.