Iron in Water

A common metal that discolors water and stains fixtures.

Iron is one of the most common well water complaints — not because it’s dangerous at typical levels, but because it announces itself: metallic taste, rust-orange staining on laundry and fixtures, and discolored water. The EPA treats it as an aesthetic issue, and your senses usually agree.

What it is

Iron enters water from natural deposits and from corroding iron or steel pipes. It can be dissolved (clear water that stains after standing) or particulate (visibly rusty water) — a distinction that matters when choosing treatment.

How it gets into water

Groundwater moving through iron-bearing rock is the main natural source; aging galvanized plumbing is the main household one. Iron bacteria — harmless but unpleasant — can also colonize wells and tanks, leaving slimy reddish deposits.

What a result can tell you

The EPA’s secondary guideline is 0.3 mg/L — above that, taste and staining become noticeable. A high reading confirms iron is behind the stains you’ve probably already seen, and points toward treatment: sediment filtration, water softeners for moderate levels, or oxidizing filters for higher ones.

What it can’t tell you

A strip doesn’t distinguish dissolved from particulate iron, or natural iron from corroding pipes — useful details when sizing treatment. Dietary iron in water isn’t a health concern at these levels, so this is a quality problem to solve, not a risk to fear.