Wastewater contains a number of pollutants and contaminants, including: • plant nutrients (nitrogen, phosphorus, potassium); • pathogenic microorganisms (viruses, bacteria, protozoa and helminths); • heavy metals (e.g. cadmium, chromium, copper, mercury, nickel, lead and zinc); • organic pollutants (e.g. polychlorinated biphenyls, polyaromatic hydrocarbons, pesticides); and biodegradable organics (BOD, COD); and • micro-pollutants (e.g. medicines, cosmetics, cleaning agents). All of these can cause health and environmental problems and can have economic/financial impacts (e.g. increased treatment costs to make water usable for certain purposes) when improperly or untreated wastewater is released into the environment; nutrient contamination and microbial water quality issues are considered further below. For any further query please contact us at : Bio Management Northwest | 18601 76th Ave W, Suite 102, Edmonds, WA 98026, telephone No.: 877-524-6411.