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What the Measured Range Means Against Relevant Federal Standards—and What It Does Not Mean

The U.S. Geological Survey sampled groundwater from nine wells in Anoka County’s aquifer 112GSSG, showing iron concentrations ranging from 6.9 to 2,640 micrograms per liter (µg/L), with a median of 30.3 µg/L. None of these values exceed federal thresholds that regulate iron levels in drinking water. This means no measured iron concentration in the samples indicates a violation or health risk under federal standards. However, it's important to understand that these numbers reflect the area’s groundwater, not your specific well.

What a Certified Laboratory Test for Iron Reports and How to Read It

If you test your well water through a certified laboratory, the report will provide the iron concentration in micrograms per liter or milligrams per liter. It may also compare your results to state or federal guidelines. When reviewing such reports, note that a detected level does not necessarily mean your water is unsafe. Instead, this value helps determine the need and type of treatment. Knowing your exact iron concentration is key to selecting effective treatment equipment.

What You Should Write Down Before Asking Anyone for Treatment Advice

Before seeking advice, document these details:

• Your well depth and age
• Most recent lab results for iron and other minerals
• Details about your water usage and household size
• Description of your previous water treatment system and its issues
• Pipe materials and any known plumbing age or modifications

Having these details ready enables more tailored recommendations aligned with your water’s characteristics and your home’s plumbing.

The Role of Plumbing Material and Age, Separate From the Source Water

Iron concentrations measured in your water supply can be influenced by your home’s plumbing materials and system age. Older pipes or certain metals may contribute additional iron or other deposits, altering water color and taste without reflecting the raw water source quality. Evaluating plumbing separately from groundwater data ensures an accurate diagnosis of water quality issues and guides appropriate remediation.

A Worked Example: Reading the Record’s Median and Range as a Homeowner Would

Consider the median iron concentration of 30.3 µg/L in area wells as a central tendency. This suggests moderate iron presence in the aquifer. However, the range extending to 2,640 µg/L indicates some local variation. As a homeowner, this example shows your well water could be below, near, or above median levels. Testing your own water is the only way to know where you fall within this range and what treatment is necessary.

How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means

The data represent 11 samples collected over a five-year span (2011-2016) from nine wells between 12 and 24 feet deep. Although multiple points provide insight into the area’s groundwater quality, this sample size is limited and may not capture all local variability. Therefore, area data serve as a useful context but cannot replace specific analysis of your well water.

What You Should NOT Conclude From Area Data

Do not assume that the iron concentrations measured in these Anoka County wells match your well’s iron level. Detections do not imply health risks or regulatory violations. The only way to determine your water’s condition is through sampling and laboratory testing of your specific source. When you have those results, the Autotrol Complete Well System—which ships ready to configure and offers a grain capacity of 32,000—can be considered as a comprehensive treatment solution tailored to your well’s characteristics and household needs.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2016-08-30. 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 (Anoka County): 11 results from 9 wells, median 30.3 ug/L, range 6.9-2640.0 ug/L; none above any federal threshold