Metallic taste in water is typically caused by elevated concentrations of metals or minerals. Iron, manganese, copper and zinc are common contributors, but corrosion within plumbing systems and water heaters can also cause the issue. The taste may be described as metallic, bitter, blood-like or similar to coins.
In many cases, metallic taste is primarily an aesthetic issue, but it may also indicate changes in water quality or corrosion problems within the plumbing system. If the taste appears suddenly or increases over time, a water analysis should be performed to identify the cause.
Did You Know?
Silver has been used for storing water and beverages for thousands of years. Historically, silver vessels were used to keep water fresh long before bacteria and microorganisms were understood. The reason is that silver ions possess natural antibacterial properties. The World Health Organization (WHO) describes silver as an alternative drinking water disinfectant, and silver is still used in certain water treatment products and drinking water systems to limit microbiological growth. Silver is typically applied at very low concentrations and is generally used as a complement to other hygienic barriers rather than as a stand-alone disinfection method.
Metals in Drinking Water
Many metals occur naturally in water, and several are essential for humans, animals and plants. Iron, copper, zinc and manganese, for example, are required in small amounts for normal biological functions. However, elevated concentrations over long periods may be undesirable and in some cases pose health concerns. For this reason, national and international drinking water standards include limits and guidelines for many metals.
A metallic taste often appears at concentrations far below levels normally associated with health concerns. Taste can therefore serve as an early warning sign of changing water chemistry, corrosion or elevated metal levels. Although the cause may sometimes be natural, new or increasing taste problems should be investigated through water analysis to ensure the water remains suitable for long-term use.
For those interested in more detail, comprehensive guidelines and limit values exist for metals, microorganisms and other drinking water contaminants. In Sweden, drinking water regulations are managed by the Swedish Food Agency, while the World Health Organization (WHO) publishes internationally recognized Guidelines for Drinking-water Quality. These documents are updated regularly and form the basis for much of today’s drinking water quality management.
Common Causes
- Elevated Iron Levels
- Elevated Manganese Levels
- Copper from Plumbing Systems
- Corrosion in Pipes or Water Heaters
- Low pH Increasing Metal Dissolution
- Stagnant Water in Plumbing Systems
Common Symptoms
- Metallic or Bitter Taste
- Iron or Blood-Like Taste
- Staining of Fixtures and Sinks
- Red-Brown or Black Deposits
- Often More Noticeable After Water Stagnation
Common Treatment Methods
- Water Analysis
- Iron and Manganese Removal
- Aeration or Ozone Before Filtration
- pH Adjustment
- Replacement of Corroded Plumbing Components
- Activated Carbon in Certain Applications
Example Treatment Trains
Well Water
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Aeration or Ozone
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Iron and Manganese Filter
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UV Disinfection
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Drinking Water
Water Analysis
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pH Adjustment
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Replacement of Damaged Components
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Normal Operation
A metallic taste often indicates that metals are dissolving into the water or that corrosion is occurring within the plumbing system. While the taste does not always indicate a health concern, changes in taste should be taken seriously as they may signal changing water chemistry, corrosion or elevated metal concentrations. If the problem appears suddenly or becomes more noticeable over time, water analysis and inspection of plumbing systems are recommended before selecting a treatment solution.