If coliform bacteria is detected in your water, most well owners will need to have their water supply disinfected (chlorinated). To disinfect a well a calculated amount of chlorine is added to the well and allowed to sit for a minimum of four hours. This is something that you can perform yourself or well water professional can perform for you. Once all of the chlorine has been pumped out of the water system, a coliform bacteria test should be performed to determine if the well chlorination was effective.
A well chlorination is also used to deal with bio films that can develop in wells such as iron and sulfur bacteria, and ongoing odor issues. In rare cases well chlorinations would be the recommended course of action, however in most cases well chlorination is not the correct application for these issues (see water treatment).