Iron in Well Water: Orange Stains, Metallic Taste and How to Fix It

Signs of iron

Orange or reddish-brown stains in sinks, toilets and tubs
Laundry that comes out yellowed or rust-spotted
A metallic taste in drinking water, coffee and tea
Water that comes out clear but turns orange after sitting
Slimy orange or brown buildup in the toilet tank

The three types of iron

Type	What you see	Usual fix
Clear-water (ferrous) iron	Water looks clear from the tap, then turns orange in a glass or leaves stains	Oxidizing iron filter, or a softener at low levels
Red-water (ferric) iron	Water is already cloudy or orange from the tap	Oxidizing filter with sediment filtration
Iron bacteria	Slimy orange or brown deposits, often with a swampy smell	Shock chlorination of the well, then ongoing treatment

How much is too much?

Ontario's aesthetic objective for iron in drinking water is 0.3 mg/L. Above that, staining and taste start to show up. Many wells in the area test well above it. Iron is an aesthetic problem rather than a health risk at the levels found in household water, but it is often found alongside manganese and sulphur, which are worth testing for at the same time.

Why a softener alone often is not enough

A softener can remove small amounts of clear-water iron, but iron gradually coats the resin and reduces its capacity. At higher levels, or with red-water iron or iron bacteria, the softener clogs and stops softening. Most wells with visible staining do better with a dedicated iron filter installed ahead of the softener.

Iron filter options

Air-injection (AIO) filters: draw air into the water to oxidize iron and sulphur, then filter it out. Low maintenance and no chemicals
Greensand and similar media: oxidize and trap iron, sometimes with a regenerant
Chlorination plus filtration: for high iron or iron bacteria, chlorine oxidizes the iron and controls the bacteria before a filter removes it

All of these back-wash themselves on a schedule. Sizing depends on your iron level and your well pump flow rate, which is why we test before recommending a system.

Common questions

Is iron in well water dangerous?

At the levels usually found in household water, iron is an aesthetic problem, not a health risk. But it often comes with manganese or sulphur, and an iron problem can hide a bacteria problem, so test for those too.

How do I get rust stains out of fixtures?

Iron-specific cleaners remove existing stains, but they will come back until the iron is removed from the water.

Will an iron filter also fix a rotten-egg smell?

Often, yes. Air-injection filters remove both iron and hydrogen sulphide, which commonly occur together in wells around here.