Filtering Manganese from Tap Water: Identification & Solution (2026)

Published on July 7, 2026 | Reading time: ~10 minutes

What is manganese?

Filtering manganese from tap water is a topic that is gaining increasing attention, precisely because the metal is naturally present in the soil and can reach drinking water production via groundwater. According to the RIVM, approximately 60 percent of Dutch drinking water is extracted from groundwater, meaning manganese is structurally present as a substance of concern in water purification.

In low concentrations, manganese is a normal component of our drinking water and poses no risk. Problems only arise when the concentration exceeds the applicable standards. Then, the water visibly changes color and takes on an unpleasant, metallic taste.

How does manganese get into tap water?

Manganese reaches our drinking water via two main routes. The first is natural absorption from the soil: rainwater dissolves manganese from rocks and sediments, after which it enters the groundwater. The second route is through industrial discharges and agricultural activities that can increase manganese concentrations in surface water.

Drinking water companies normally purify groundwater through oxidation and filtration processes to remove manganese. However, manganese can still be present in the pipe network after purification, particularly due to:

• Deposits of manganese oxide in old water pipes that detach during pressure fluctuations
• Short peaks in source water quality, for example after heavy rainfall
• Regional groundwater areas with naturally higher manganese concentrations
• Old installations in the house itself, such as outdated copper or steel pipes

How to recognize manganese in your tap water?

Too high a manganese concentration usually gives clear signals. If you recognize one or more of the following situations, manganese is a possible cause:

• Brownish or yellowish water: the water has a slight discoloration, which is strongest in the first stream after a period of stagnation in the pipe.
• Metallic or bitter taste: the water does not taste fresh, but has a mineral or bitter undertone that you still taste after drinking.
• Brown stains on laundry: light clothing or towels show brown or rust-colored stains after washing.
• Scale in kettle or coffee machine: brownish scale in kettle or coffee maker that returns faster than normal.
• Discoloration of cooked vegetables: potatoes or vegetables turn brownish when cooked in tap water with a high manganese content.

Please note: a brownish color can also be caused by rust from pipes or by iron. If in doubt, a water quality test can provide more clarity. Laboratories such as Kiwa or SGS perform affordable private water analyses for 30 to 80 euros.

Is manganese in tap water dangerous for health?

Manganese is an essential trace element. An adult human consumes 2 to 10 mg of manganese daily through food, particularly through meat, nuts, grains, and vegetables. The contribution of drinking water to the total daily intake is relatively small, especially at the concentrations found in Dutch tap water.

At the concentrations normally measured in Dutch tap water, well below the limit of 0.05 mg/l, there is no health risk. Most complaints at higher concentrations are aesthetic in nature: color, taste, and stains.

At PureFilter, we see that customers with manganese-related complaints primarily suffer from the taste and the scale in their appliances, not from alleged health effects. The main reason to filter manganese is therefore water quality in a broad sense: clean, tasty water without unwanted substances.

Legal standards for manganese in drinking water

In the Netherlands, the quality of drinking water is laid down in the Drinking Water Decree, based on the European Drinking Water Directive. The relevant standards for manganese are:

Drinking water companies are legally obliged to purify water to well below the norm of 0.05 mg/l. In practice, Dutch tap water in the vast majority of the country meets this requirement. However, local deviations can occur, particularly in regions with deep groundwater or during temporary disruptions in the purification process.

How to filter manganese from tap water?

There are several methods for filtering manganese from tap water. The choice depends on the severity of the contamination, the budget, and installation preferences. Below, we describe the most relevant options for households.

1. Inline water filter (under sink)

An inline water filter is mounted directly to the cold water line under the sink and filters all water leaving the kitchen tap. NSF 53-certified filters remove heavy metals, including manganese, using activated carbon and specific filter layers. This is the most practical and cost-effective solution for most households.

The PureFilter Mineral+ combines advanced filtration steps (NSF 42, 53, 61, and 372) with Swedish Mineral Rock technology that adds calcium, magnesium, and potassium after filtration. Price: 149.90 euros including two filter cartridges. The replacement filter is available from 49.90 euros and has a capacity of 15,000 to 20,000 liters.

2. Pitcher filter (tabletop model)

A pitcher filter like Brita uses activated carbon and an ion exchanger. It filters manganese to some extent, but less effectively than an NSF 53-certified system. Moreover, the filter capacity is small (approximately 100 to 150 liters per cartridge) and requires daily refilling and regular replacement of the cartridge.

3. Reverse osmosis (RO system)

An RO system removes virtually all dissolved substances, including manganese. The disadvantage is that all minerals are also removed, which makes the water taste flat. Installation is more intrusive, more expensive (500 to 1,500 euros for purchase and installation), and produces relatively much wastewater. For households with mild manganese problems, this is usually an overkill solution.

4. Whole-house manganese filter

For homes with a private well or severe manganese contamination in all pipes, there is the option of a whole-house oxidative filter. This system oxidizes manganese using a filter medium (such as birm or greensand), after which the precipitated solid is retained. Purchase price: 800 to 2,500 euros, excluding installation by a plumber. Useful when all taps in the house show problems.

Comparison: filter options for manganese side by side

Buying advice: which filter is right for you?

For most households in the Netherlands who occasionally experience nuisance from manganese in tap water, an NSF-certified under-sink water filter is the most balanced choice. The filter installs without a plumber in 5 to 10 minutes, filters all contaminants including manganese, PFAS, chlorine, pesticides, and medicine residues, and at the same time adds minerals for a fresh, soft water taste.

For those who also want to treat water for the washing machine or shower, for example in case of structural brownish scale throughout the house, a whole-house oxidative filter is a better choice. However, that is an investment and requires professional installation.

Frequently asked questions about manganese in tap water

Conclusion

Filtering manganese from tap water is not an urgent health necessity for most Dutch households, but it is a sensible choice for those who experience issues with a metallic taste, brown discoloration, or deposits in appliances. Manganese occurs naturally in the soil and can enter tap water via groundwater, even after regular purification by drinking water companies.

An NSF 53-certified inline water filter offers the most practical solution for the kitchen tap: easy installation in 5 to 10 minutes, a high filter capacity of 15,000 to 20,000 liters per cartridge, and certification that guarantees the removal of manganese, heavy metals, and over 100 other contaminants. The PureFilter Mineral+ goes a step further by also adding calcium, magnesium, and potassium to the filtered water through Swedish Mineral Rock technology.

Do you want to know if a water filter is also suitable for other contaminants in your region? Then check out the overview of the best water filters or read more on the PureFilter FAQ page.