How Metallic Elements Enter Groundwater in Hennepin County

Iron Presence in Aquifer 112GSSG

U.S. Geological Survey sampling in Hennepin County's aquifer 112GSSG found iron in 21 of 23 well samples dated 2011 to 2016. These wells, 9 to 29 feet deep, showed a median iron level of 92.7 micrograms per liter, with results ranging up to 4,450 micrograms per liter.

Natural Iron Sources in Local Geology

The aquifer's surrounding geology naturally contains iron minerals. Groundwater flowing through these minerals can dissolve iron, leading to its measurable presence in well water. This contributes to metallic taste but is not an automatic indicator of health risk.

Stepwise Checks to Identify the Cause of Metallic Taste

Examine Outlet Fixtures and Plumbing Materials

Confirm whether metallic taste appears at all taps or only certain fixtures. Older plumbing components or corroded parts can impart a metallic flavor independent of water source quality.

Flush Water Lines

Run cold water for several minutes to clear stagnant water that sometimes develops a metallic taste during low use periods.

Collect a Laboratory Water Test

Because local iron levels vary widely, only testing your water establishes your home's specific concentrations. This testing will verify if iron or other metals are present at levels that contribute to taste issues.

Distinguishing Metallic Taste from Other Commonly Confused Water Sensory Issues

Differentiate Between Metallic and Chlorine Tastes

Municipal disinfection can cause a bleach-like taste, which is distinct from the metallic flavor often linked to dissolved metals.

Rule Out Other Sources Like Plumbing Corrosion or Water Stagnation

Metallic taste caused by local plumbing contrasts with source water issues. Flushing and fixture checks help distinguish these causes.

Interpreting the Regional Data for Your Household

Median Versus Range: Understanding What Typical and Extreme Values Mean

The median iron level in sampled wells was 92.7 micrograms per liter, suggesting many homes in this aquifer could detect metallic taste. However, the range extends up to 4,450 micrograms per liter, illustrating that some wells have much higher iron presence.

Federal Thresholds Clarified

None of these samples exceeded federal limits, meaning the detected iron levels are not violations but can still cause taste issues.

Assessing Treatment Capacity for Your Household's Daily Water Needs

Consider Your Household Size and Daily Water Volume

Any solution must handle the volume of water your household consumes daily to consistently address metallic taste.

Evaluate Previous Equipment Limits

If existing equipment fails to keep up, a system designed for higher capacity like the Fleck Metallic-Tasting Water Filter that ships ready to configure may be beneficial.

Sample Size and Data Limitations Behind Regional Measurements

Number of Wells and Samples

The regional data derives from 23 samples across 20 wells, providing a moderate dataset for understanding typical groundwater conditions in this part of Hennepin County.

Implications of Sampling Depth

Sampled wells were relatively shallow—9 to 29 feet deep—meaning deeper wells might experience different iron levels.

Summary: This checklist guides you through the common causes and diagnostic steps for metallic taste in Hennepin County waters from aquifer 112GSSG. Start with simple fixture and flow checks, then move to laboratory testing to confirm your water’s iron content before considering a higher-capacity treatment like the Fleck Metallic-Tasting Water Filter. Understanding regional sampling data is key to making informed decisions about managing your household’s water quality.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2016-09-08. 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 Iron in the 112GSSG aquifer (Hennepin County): 23 results from 20 wells, median 92.7 ug/L, range 8.5-4450.0 ug/L; none above any federal threshold