When you notice unusual staining or black particles at a faucet in Whatcom County, it could be due to manganese. Manganese is naturally present in the groundwater of aquifer 112SUMS, and its effects on household water can vary. This page guides you through the steps to identify manganese-related issues and decide on testing and treatment.

Household Symptoms That May or May Not Indicate Manganese

Check for dark stains on sinks, toilets, or fixtures

Black or dark brown stains can form when manganese is present in water, particularly after exposure to air. These stains can resemble other common water deposits but are often linked to manganese.

Note any unusual black particles in water or on plumbing components

Particles that settle or appear in water may come from manganese deposits, but they might also originate from other causes such as pipe corrosion or sediment.

Absence of unpleasant taste or odor

Manganese usually does not affect taste or smell, so their absence doesn't rule out manganese presence.

Check if water discoloration varies by time of day or after periods of non-use

Variability in water color can suggest manganese fluctuations or other water quality issues.

Order of Checks from Least to More Involved

Visual inspection of stained fixtures

Look for patterns and black staining that may indicate manganese rather than rust or dirt.

Flush the water system

Running water for several minutes may reduce some discoloration caused by manganese particles.

Test water for common parameters

Basic water tests may help exclude other common causes such as iron or sediment before focusing on manganese.

Collect a water sample for laboratory manganese testing

Confirming manganese concentration requires a certified laboratory test of your own tap water.

Seasonal and Multi-Year Variations in Manganese Levels

Data from 2010 to 2018 Shows Continuous Detection in Whatcom County Aquifer

Samples collected from eight wells in aquifer 112SUMS, ranging from 18 to 40 feet deep, showed manganese detected in 8 out of 11 results over nearly eight years.

Range of Concentrations Varies Over Time

Measured manganese ranged from 0.17 to 12.7 micrograms per liter, showing some seasonal or temporal variation but always below federal thresholds.

Median Level Indicates Typical Presence

The median concentration was 1.19 micrograms per liter, indicating that manganese is commonly present but not at levels measured in your own well without specific testing.

What a Certified Laboratory Test Reports and How to Use It

Quantitative Manganese Concentration in Micrograms per Liter

The test provides numeric values for manganese concentration, allowing comparison to federal guidelines and local expectations.

No Result Above Federal Threshold in Area Samples

USGS data from Whatcom County shows no manganese concentrations exceeding any federal limits in sampled wells; however, only your own water test determines your water composition.

Use Results to Decide on Treatment Needs

Test outcomes guide whether treatment is necessary, and if so, which equipment is suitable for your household's manganese level.

Adjustments for Larger or Seasonal Residential Use

Higher Water Use May Require Equipment with Greater Capacity

Households with increased daily water demand, including larger families, may need more robust treatment options to handle manganese effectively.

Seasonal Properties Can Experience Changing Water Quality

Water chemistry can fluctuate with well recharge and usage patterns. Treatment equipment should accommodate varying manganese loads over time.

Periodic Testing Ensures Continued Effectiveness

Homes used seasonally or with changing occupancy benefit from periodic water retesting to confirm manganese levels remain manageable.

To resolve manganese concerns after equipment failure, ordering a certified laboratory test on your household water is the essential next step. This test will quantify manganese concentration and clarify if treatment like the Autotrol Black Manganese Stains Filter, which ships ready to configure, is appropriate to restore water quality and reduce staining in your home’s fixtures.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2018-08-08. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.

On record: U.S. Geological Survey sampling of Manganese in the 112SUMS aquifer (Whatcom County): 11 results from 8 wells, median 1.19 ug/L, range 0.17-12.7 ug/L; none above any federal threshold