“Aluminum is a secondary contaminant because there were no clear health effects from the presence of aluminum when this limit was set. Secondary contaminant limits are not enforced but only recommended.”
The Food and Drug Administration limits aluminum in bottled water to the recommended 0.2 milligrams per liter (equivalent to 0.2 parts per million).
Norman’s well water is not tested for aluminum.
The change to ferric sulfate has been in the works for about a year but was delayed because of an ozone pilot project, Mattingly said.
In 2007, city council members decided to use ozone in future water treatment. That project is being completed in two phases. Currently, the city is entering the design stage for Phase 2.