Domestic water treatment processes utilize physical processes such as filtration, chemical, settling, and membrane-based reverse osmosis processes along with disinfection for water filtration and purification purposes. This kind of water is mostly pretreated water from the source of supply and needs only further polishing treatment prior to end-use. The domestic treated water can be used for general day to day activities like cleaning, washing, bathing, general-purpose, etc. The wastewater that is derived from household human activities like laundry, bath, garbage, dishwashing, garbage disposal, toilets, and others are known as Domestic Wastewater that usually comprises relatively lower amounts of contaminants but with a much lower amount of pollutants can create a big impact on the environment. So for all of this, a properly maintained and installed domestic water treatment system for disposing and treating household wastewater will decrease the impact on surface and groundwater. During modern times, an important role is played by domestic water treatment. It ensures that the entire household sewage is treated properly for making it safe, clean, and suitable to be released back into the environment, streams, or lakes. Household sewage systems are designed to be able to treat all of the liquid waste that is generated from a residence. In domestic wastewater, possible contaminants include several diseases causing infectious viruses, bacteria, excess nutrients like nitrate and household chemicals. In big industries, a sewage water treatment plant can be applied and also can be used at residential properties of the minuscule level. For residential properties, the installed plant is for only a fewer number of people and so it is known as a Domestic Sewage Water Treatment Plant. For preventing water scarcity in properties or areas these plants are installed. Domestic sewage substantially comprises of wastes in the form of food, paper, wastewater of sink and bathroom, humans wastes, and others. For this, it becomes very much necessary to remove all this waste before it gets introduced to the environment. Instead of going to waste, the treated water gets clean and reuse. This will help for developing a sustainable and eco-friendly environment and will help for saving water for our future generations. With a domestic water treatment system, all major contaminations from water can be removed no matter if they are solid or tiny. A process for attaining quality treated water is followed for this by domestic plants.