Iron is a naturally occurring element found in rock formations, soil and water. It is also an essential nutrient in all forms of life. The primary source of iron for most people is food. Iron is the primary substance that the Water Works and Lighting Commission removes in its treatment process. This is accomplished through oxidizing the iron, letting the large particles settle out and then filtering the water.
There is no federal regulation for concentrations of iron in drinking water for health reasons. However, there is a federal secondary standard of 0.3 ppm (ppm =mg/L) based on aesthetic considerations such as taste and color. At concentrations above 0.3ppm iron begins to cause problems such as staining and odors. The finished water entering the distribution system from WW&LC usually has an iron content of 0.0 ppm.