Iron
Iron is an abundant, naturally occurring metal in the environment that exists in three forms in water: ferrous ('clear water iron'), ferric ('red water iron'), and organic iron. Ferric and ferrous iron are both inorganic forms, differing in oxidation states. Organic iron consists of elemental iron bound to organic compounds, typically acids. Iron is commonly found in tap water and it is known for causing reddish or yellowish discoloration and staining. Ferric iron gives water a reddish-brown tint, while organic iron can impart a more yellow color. Although ferrous iron is clear in water, it can still leave behind reddish-brown stains when it precipitates out. While iron in drinking water is not typically considered harmful to human health, the presence of iron can lead to or indicate other hazards, such as pipe corrosion.
EPA MCLG Level
4 ppb
Maximum level that poses minimal health risk based on the latest science
Health Effects
The iron found in drinking water is not typically associated with adverse health effects. Acute exposure to iron can cause gastrointestinal issues, though such concentrations are less common in drinking water. The presence of iron in tap water can indicate or lead to other health hazards associated with corrosion.
Affected Organs & Systems:
Common Sources
- Iron naturally dissolves into groundwater as it seeps through soil and rock. Iron in tap water may also come from corroded plumbing or fixtures. Pollution sources like mining and industrial waste may contribute to elevated iron levels as well.
How to Remove It
Water filters certified under the following NSF standards are effective at removing Iron:
EPA MCLG Level
The EPA MCLG represents the maximum level that poses minimal health risk based on the latest scientific research. It's often more protective than federal legal limits.
Contaminant Type
Iron is classified as a Metals contaminant.
This contaminant primarily affects the gastrointestinal.
Check Your Water
Find out if Iron is in your tap water.
Search Your CityTest Your Water for This Contaminant
Public water reports may not test frequently enough or at your specific tap. Professional home testing provides current, location-specific results.
SimpleLab
Standard Home Water Test
$232
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
SimpleLab
Advanced Home Water Test
$369
Most comprehensive home water test including all standard tests plus additional parameters for ultimate peace of mind.
Tap Score
Advanced Microplastics Test
$636
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.