Pesticides are often used on farms or garden and run the risk of discharging into water supplies. In the event that there is a well that is contaminated, it has to be tested for pesticide pollution, as only municipal water can be treated. In dealing with pesticides and using home water filtration systems, it may not always prove to be as effective.
Water purification systems that are home-made are not always effective in providing safe drinking water. These systems have to undergo regular maintenance and often have to be replaced in order to effectively filter out all the dangerous organisms and metals.