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[[Image:iron filter icon.png|right|80px]]

[[Image:iron filter.jpg|thumb|right|200px|Building an iron filter. <br>Photo: PCWS]]

Iron is a naturally occurring element in the earth's crust and tends to leave a reddish-brown residue in water that tastes unpleasant and stains clothing, therefore removal is required. It is recommended, however, to check to see if the iron is geological or residue from water pumps with iron parts. If it is from the pump, replacement with a non-iron pump (i.e. stainless steel) could remove the iron from the water so that it is back to a drinkable standard. <ref name="Uganda study"/>