Drilling a water well is the first step in having a source of treated drinking water is simply a healthy choice. The second step is testing your water for contaminants. Water testing may reveal the need for a treatment system to deal with various organic and inorganic contaminants that can be present in your drinking water. There are two types of treatment systems available. A “point of entry” system is installed inline with your water main and treats all of your water as it enters the house. A “point of use” system is generally smaller, less costly, used to treat water at a faucet, and is generally more for purifying water for drinking, cooking and sometimes washing.