Black or dark brown stains on your fixtures? ManganeseManganeseA mineral that causes black or brown staining and can affect the taste of water. Often found alongside iron in well water.EPA Secondary MCL: 0.05 mg/L (ppm). EPA Health Advisory: 0.3 mg/LLearn more → (a mineral that dissolves from rock into groundwater) is likely the cause.
Manganese is often overlooked next to iron. But it has a health advisory that makes it more concerning than most homeowners realize[1].
Quick Answer
The EPA staining threshold is 0.05 ppmPPM (Parts Per Million)A unit of concentration equivalent to milligrams per liter (mg/L). Used for most common contaminants like iron, manganese, and nitrates.Learn more → (parts per million). The health advisory is 0.3 ppm. An air injection oxidationAir Injection OxidationA chemical-free treatment method that injects air into water to oxidize dissolved iron, manganese, and hydrogen sulfide into solid particles that are then filtered out.Learn more → (a chemical-free system that uses air) handles manganese up to 1 ppm. Higher levels need greensandGreensandA naturally mined mineral filter media (glauconite) coated with manganese oxide. Oxidizes and filters iron, manganese, and hydrogen sulfide. Requires periodic regeneration with potassium permanganate.Learn more → (a filter media) or chemical injectionChemical InjectionA treatment method that uses a pump to inject chlorine or hydrogen peroxide into water before filtration. Used for high levels of iron (>7 ppm), manganese, or bacteria.Learn more → (chlorine added before filtration).
What Is Manganese and Why Is It in Your Well?
Manganese is a natural mineral in soil and rock. Groundwater dissolves it the same way it dissolves ironIronA naturally occurring mineral found in groundwater. Iron causes orange/rust staining on fixtures and laundry and gives water a metallic taste.EPA Secondary MCL: 0.3 mg/L (ppm)Learn more → (a mineral that causes orange stains). The two often appear together[4].
Think of iron and manganese as cousins. Iron stains orange. Manganese stains black. Both come from the ground.
Have your water test results? Get a treatment plan based on your exact numbers.
Analyze My Water TestHealth Risks of Manganese in Well Water
Unlike iron, manganese has real health concerns. The EPA issued a health advisory at 0.3 ppm[1]. Long-term exposure may affect the nervous system.
Children face higher risk. Studies link high manganese in drinking water to learning and behavior problems[3]. Health Canada set their limit at 0.12 ppm — stricter than the U.S.
The WHO also flags manganese as a health concern at elevated levels[8].
What Your Manganese Level Means
| Level | Status | What You'll Notice | What to Do |
|---|---|---|---|
| 0–0.05 ppm | Safe | No staining. No health concern. | No treatment needed. |
| 0.05–0.3 ppm | Staining | Black/brown stains on fixtures and laundry. | Air injection oxidation system. |
| 0.3–1 ppm | Health Advisory | Staining plus health concern for children. | Air injection or greensand system. |
| 1+ ppm | Priority | Heavy staining. Significant health concern. | Chemical injection + filtration. |
How to Test for Manganese
A standard well water panel includes manganese. Also test for ironIronA naturally occurring mineral found in groundwater. Iron causes orange/rust staining on fixtures and laundry and gives water a metallic taste.EPA Secondary MCL: 0.3 mg/L (ppm)Learn more → (orange staining mineral), pH, and hardnessHardness (Calcium Carbonate)The concentration of dissolved calcium and magnesium in water. Hard water causes scale buildup in pipes, water heaters, and fixtures.No EPA standard. Soft: <1 gpg. Moderate: 1-7 gpg. Hard: 7-10.5 gpg. Very Hard: >10.5 gpg.Learn more → (dissolved calcium and magnesium). These affect which treatment system works best[5].
Cost: $30–$80 for a basic panel at a state-certified lab.
3 Ways to Remove Manganese from Well Water
Up to 1 ppm: Air Injection Oxidation
An air injection oxidationAir Injection OxidationA chemical-free treatment method that injects air into water to oxidize dissolved iron, manganese, and hydrogen sulfide into solid particles that are then filtered out.Learn more → system handles manganese up to 1 ppm and iron up to 7 ppm. It uses air to convert dissolved manganese into particles that a filter catches[6].
Cost: $1,400–$2,200 installed.
Check price at US Water Systems
1–3 ppm: Greensand Filtration
A greensandGreensandA naturally mined mineral filter media (glauconite) coated with manganese oxide. Oxidizes and filters iron, manganese, and hydrogen sulfide. Requires periodic regeneration with potassium permanganate.Learn more → (a mineral filter media coated with manganese oxide) filter excels at higher manganese levels. It oxidizes and traps manganese as water flows through. Requires periodic regeneration with potassium permanganate[5].
Cost: $1,200–$2,000 installed. Chemical cost: $40–$80/year.
Check price at US Water Systems
Above 3 ppm: Chemical Injection + Filtration
For very high manganese, chemical injectionChemical InjectionA treatment method that uses a pump to inject chlorine or hydrogen peroxide into water before filtration. Used for high levels of iron (>7 ppm), manganese, or bacteria.Learn more → (chlorine or hydrogen peroxide) forces manganese into solid form before filtration[6].
Cost: $1,800–$3,500 installed. Chemical cost: $50–$100/year.
Check price at US Water Systems
DIY vs. Professional Installation
Air injection and greensand systems need plumbing work. If you can cut pipe and use fittings, plan for 4–6 hours. Professional installation adds $300–$600.
Chemical injection is more complex. Professional installation is recommended.
What to Do Next
Haven't tested? Get a lab test for manganese, iron, pH, and hardness.
Know your level? Use our Water Test Interpreter for a personalized plan.
Have iron too? Most manganese systems also handle iron. Read our iron guide for the full picture.
Frequently Asked Questions
Is manganese in well water dangerous?
The EPA health advisory is 0.3 ppm[1]. Long-term exposure above this may affect the nervous system, especially in children.
What causes black stains from well water?
Manganese. It stains black or dark brown at levels as low as 0.05 ppm[2]. It dissolves from rock and soil into groundwater.
What filter removes manganese?
Air injection oxidation handles up to 1 ppm. Greensand handles 1–3 ppm. Chemical injection handles 3+ ppm. Many of these also remove iron.
Is manganese the same as iron?
No. Both are dissolved minerals, but iron stains orange and manganese stains black. They often appear together. Many filters treat both at once.
References
- U.S. EPA. "Drinking Water Health Advisory for Manganese." Office of Water, 2004. https://www.epa.gov/sdwa
- U.S. EPA. "National Secondary Drinking Water Regulations: Manganese." 40 CFR Part 143, 2024. https://www.epa.gov/sdwa/secondary-drinking-water-standards-guidance-nuisance-chemicals
- Health Canada. "Manganese in Drinking Water." Guidelines for Canadian Drinking Water Quality, 2019.
- U.S. Geological Survey. "Manganese in Ground Water." NAWQA Program, 2023. https://www.usgs.gov/mission-areas/water-resources
- Water Quality Association. "Manganese in Water." Technical Fact Sheet, 2024. https://wqa.org
- Penn State Extension. "Iron and Manganese in Private Water Systems." 2023.
- Minnesota Department of Health. "Manganese in Drinking Water." 2023.
- WHO. "Manganese in Drinking-Water." Background Document, 2021. https://www.who.int