Municipal Drinking Water
Since 70% of the wholeness of the earth was composed by water reason why most of the people took for granted the role of pure drinking water in our daily lives. Providing an adequate water supply for a municipality includes three things:
1) Finding and developing an adequate water source;
2) Treating the water to insure that it is clean enough to drink; and
3) Delivering the water to every residential, commercial, institutional and industrial building within the service area.
This is the fact that most of the people in a community do not know about. The process of producing pure water is not an easy work.

Water Treatment of Municipal Water
For much larger public water systems, particularly when the water source is subjected to repeated human contact such as heavy recreational use, the treatment process is much more complicated and will likely include a combination of the following processes
Initial Filtration - Mostly the initial filtration is the separation of the tangible objects that might be floating on the water. That includes fishes, leaves, rocks, small trashes, etc.
Coagulation & Sedimentation - Alum and lime are added to the water. Those chemicals that are added to the sediments make the floc (or the white foam on the surface of the water) subside.

Disinfection – By using chlorine, it serves as a germ-killing agent.
Aeration - The presence of dissolved gas such as natural occurring hydrogen sulphide and residual chlorine are the result of bad odor and taste of water. To reduce it, tiny bubbles of air were forced through the water to release of these gases from the solutions.