Iron generally occurs naturally in water and does not present a problem.  As iron levels increase, plumbing and laundry stains will occur.  In some cases, the levels and type of iron can form sludge deposits, creating problems with well tank bladders, plumbing lines, water heaters, toilets and other plumbing fixtures.  Iron usually leaves a reddish brown stain.

Acceptable results:  Less than 0.3 ppm.

Sources:  Naturally and corrosion of pipes.

Recommended testing:  Annually if water is considered corrosive or if rust type laundry stains appear.