There are two types of water pollution. The first is point source pollution; this is where contaminants enter the water from a single source that can be located. The second of water pollution is from non-pointed sources, these are sources that do not come from one source but rather many sources working together. An example of this is from fertilized land. Water runoff collects come of the fertilizer from several different fields and the fertilizer finds its way into the water supply causing polluted water. Water pollution is a constant battle all around the world. Water treatment facilities work nonstop to provide good clean water for everyone to enjoy.
Small scale and cottage industries cause no less water pollution than the large scale industries. There are about 3 million small scale and cottage industrial units in India. These units neither have, nor can they afford appropriate sanitation and/or pollutant disposal systems, and yet have not hasistated in adopting highly polluting production technologies such as chrome, tanning of leather, use of azo-dyes in fabrics, use of cadmium in ornaments and silver-ware, electroplating with cyanide baths, production of dye-intermediates and other refractory and toxic chemicals, etc.