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. Particulates Of or relating to minute separate particles. Pesticides Any substance or chemical applied to kill or control pests, including weeds, insects, algae, rodents and other undesirable agents. Radioactivity The spontaneous decay or disintegration of an unstable atomic nucleus, accompanied by the emission of radiation.