It is estimated that more than 30 million homes have point-of-use systems installed
Many people today have become concerned about the quality of their drinking water. A growing number of contaminants are regulated by the government's safe drinking water standards. These contaminants enter water supplies through landfills, deteriorating underground storage tanks, industrial waste, agricultural fertilizers and pesticides, sewer discharges reaching other sources of water supply, and leaching from pipes, solder and connector joints.
Individuals contaminate, too. Some believe storm sewers, septic tanks or empty lots are safe dumping grounds for home chemicals such as used car oil and cleaning solvents. Disposed this way, these contaminants can find their way into the water supply. In addition, in both rural and suburban areas, pesticides and fertilizers are posing water quality problems. In some regions, the contamination is widespread.