Manganese in Drinking Water: The Overlooked Contaminant

Manganese is a common but often overlooked contaminant that can affect the quality of your drinking water. While this mineral is a natural source, elevated levels can lead to staining, unpleasant taste, and potentially cause health issues over time. Manganese can go unnoticed due to its subtle signs, and many homeowners have even mistaken it for other issues.

In this article, you'll discover how manganese impacts your water and what to do to maintain a clean, safe household supply.

What is Manganese and Where Does it Come From?

Manganese is a naturally occurring mineral and is found in soil, rock, and groundwater. In small doses, it's an essential nutrient for the human body. However, when high levels of it show up in your drinking water, it can be a nuisance and a cause for concern. Manganese typically enters water supplies through the natural weathering of rocks and minerals.

It's mostly found in groundwater sources such as private wells, where water has sustained contact with manganese-rich soil. Manganese can also be found in areas with low oxygen levels, as this causes it to dissolve more easily. Therefore, it is harder to filter out without proper treatment.

Signs You May Have Manganese in Your Water Supply

Because the warning signs of manganese aren't particularly obvious, it's easy for it to be overlooked. However, with increased levels, telltale indicators start to appear. The most common sign is a dark brown or black stain that appears on sinks, bathtubs, toilets, and laundry, which can be stubborn and difficult to remove. Another sign is a metallic or slightly bitter taste in your water, which occurs when levels are higher. In some cases, manganese can discolor your water or leave behind sediment in standing water.

Health Effects of Manganese at High Levels

Manganese is necessary in minute amounts; however, too much exposure over time, especially through drinking water, can pose health risks. Intaking manganese at high levels can lead to neurological effects, especially in infants and young children.

Studies suggest that this can impact learning, behavior, and motor skills during early development. Adults can also be affected, as the nervous system becomes vulnerable when exposed to high concentrations, though this is less common. Because of these health risks, it is recommended to keep manganese levels in drinking water as low as possible, especially if there are children in the home.

However, testing is the only reliable way to detect high levels, as manganese is colorless in some forms and not always noticeable by taste or smell.

Manganese vs. Iron: How Treatment Differs

Manganese and iron are often found together in water and can have similar effects when it comes to staining and discoloration. However, they should be treated differently:

Iron

Produces reddish or orange stains. Can be removed through oxidation and filtration.

Manganese

Forms dark stains that are challenging to treat. Needs a high pH or stronger oxidizing agents to become solid and be filtered out.

Your water must be accurately tested to determine the right treatment to be used for the contaminants present.

Effective Filtration Options for Manganese Removal

Manganese can be removed from water through several filtration methods:

Oxidation + Filtration: This process uses oxidizing agents to turn dissolved manganese into solid particles. They are then filtered out by a media filter that uses manganese dioxide.
Reverse Osmosis (RO): Uses a fine membrane to remove manganese and many other contaminants.
Chemical Oxidation: This method is robust and designed for high concentrations. It uses chlorine or potassium permanganate, combined with a backwashing filter.
Water Softener: Can remove low levels of manganese, as well as hardness minerals.

If you're not sure where to start, a comprehensive well water filtration system can effectively address manganese, along with other groundwater contaminants. For maximum removal efficiency, a whole-house reverse osmosis system provides superior treatment for manganese and multiple other contaminants. Contact a trusted water testing specialist to determine your water's manganese levels and receive the most effective treatment strategy. When treated properly, your water will be clean, clear, and safe for you to use.