In cities like Mumbai where there are a large number of cowsheds, the milk collected is often resold by doodhwalas who go from house to house supplying the milk. Though this very convenient for some, it may be risky as the milk seller may be adulterating the milk adversely affecting the quality of the milk. While adding water is the simplest way of adulterating the milk, there are other more dangerous additives that may be added to the milk like chemicals, lime which can become a health hazard.

The milk sellers are aware of the fact that most retail customers do not have the technology and money to test the quality of the milk which they are getting