Pesticides and herbicides, which may come from a variety of sources, such as agriculture, urban storm water runoff and residential uses. Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, and septic systems. The filters use nature's own water purification method as the settled water passes through layers of anthracite, sand, garnet, and gravel. The entire treatment process is continuously and closely monitored. Water samples from each phase of the process are tested according to a strict daily schedule at the plant's laboratory.
Independent laboratories conduct additional tests.
The concentrations of a contaminant that, if exceeded, triggers treatment or other requirements that a water system must follow. An abbreviation for the Center for Disease Control, an agency of the federal government. An abbreviation for the Environmental Protection Agency, a federal agency. Water leaving the treatment plant and entering the distribution system. The level of a contaminant in drinking water below which there is no known or expected risk to health.