Actually, there are three types of water. There is Utility Grade Water, Working Grade Water and Drinking Water. Utility grade water is water suited for watering your lawn and plants. It usually requires no water treatment. Working Grade Water needs to be higher quality because it runs through your plumbing, fixtures and water-using appliances. To make these essential household systems last longer and save you money, a whole house water filter system is needed. Drinking Water is a key component of our lives. Since 70% of the human body is water, the water we drink and cook with must be the highest quality.