MCLs are set as close to the MCLGs as feasible, using the best available treatment technology. The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety. Microbial A group of microorganisms such as bacteria, protozoa and viruses. A dissolved form of nitrogen found in fertilizers and sewage by-products that may leach into ground water and other water sources.
Nitrates occur naturally in some waters.
Over time, nitrates can accumulate in aquifers and contaminate ground water. Organic Of, pertaining to, or derived from living organisms. Organic matter contains carbon, hydrogen and oxygen. Examples include humans, plants and animals. Organism A plant or animal.