What level of chlorine concentration in a drinking water supply could be considered excessive?

A chlorine concentration of 30 ppm in a drinking water supply is considered excessive. The acceptable range for chlorine levels in drinking water is typically between 1 to 4 ppm, with a maximum allowable limit set by the Environmental Protection Agency at 4 ppm for finished drinking water. Concentrations above this threshold, particularly as high as 30 ppm, can pose health risks to consumers and may lead to unpleasant tastes and odors. High levels of chlorine can also cause corrosion of plumbing fixtures and can create harmful by-products when chlorine reacts with organic materials present in the water. Therefore, a chlorine level of 30 ppm clearly exceeds safe drinking water standards, making it the inappropriate choice for a potable water supply.