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Understanding Detected, Median, and Range in Shelby County Iron Sampling

The U.S. Geological Survey’s sampling of five wells in Shelby County’s 100ALVM aquifer found iron present in every test. Specifically, iron was 'detected'—meaning measurable amounts were found—in all 10 samples taken between September 20 and 28, 2017. The recorded iron concentrations ranged from 2,850 to 24,500 micrograms per liter (ug/L), with a median value of 16,200 ug/L. 'Detected' simply means the testing instrument identified iron; it is not an indication of poor or unsafe water quality by itself. The 'median' represents the middle concentration value when all samples are arranged from low to high, providing a typical snapshot for the area. The 'range' shows the variability across different wells and sample dates within the study.

How Certified Laboratory Reports Present Iron Levels in Household Water

A certified water test report for your home water will list iron concentrations in similar units and provide comparison benchmarks. These reports indicate the concentration detected for your specific source, distinguishing it from public sampling. Your individual results will clarify whether iron is present and at what level. Unlike area-wide data, your report may also remark if iron levels exceed aesthetic benchmarks related to staining or taste, but these are not health-based limits. Understanding your own water’s iron concentration requires such testing because regional data does not confirm your well’s condition.

Influence of Sample Depth and Well Characteristics on Iron Expectations

The depth of groundwater sampling influences iron concentration expectations. Shelby County wells sampled were between 55 and 166 feet deep within the 100ALVM aquifer. Groundwater conditions, including oxygen levels and mineral content at these depths, can affect iron presence and form. Different wells, even nearby, can show wide variations due to geological and hydrological factors. As a result, knowing the depth and source type of your water supply is essential for anticipating iron presence and selecting water treatment equipment that matches your household’s needs.

Distinguishing Aesthetic Secondary Standards from Health-Based Limits for Iron

Federal limits for constituents like iron differentiate between health-based thresholds and aesthetic secondary standards. Iron has no federal health-based maximum contaminant level (MCL) because it is not harmful at typical groundwater levels. Instead, secondary standards address aesthetics such as taste, staining, and discoloration. Exceeding these levels may lead to unpleasant water characteristics, but does not indicate unsafe water. The Shelby County iron data show all samples below any federal health-based limit, reaffirming that detected iron relates mainly to nuisance concerns.

Comparing Shelby County Iron Data With Neighboring Areas Without Overinterpreting

While Shelby County’s 100ALVM aquifer iron data provides a useful reference point, neighboring counties and different aquifers may show different iron profiles. These differences can arise from varying geology, land use, and groundwater dynamics. Comparing area records helps contextualize your region’s water characteristics but should not substitute for testing your water source. Regional data cannot confirm your specific well’s quality or guarantee identical conditions beyond the sampled sites.

What Shelby County Residents Should Not Conclude From Area Iron Sampling

Residents should not assume their water supply contains the exact iron concentrations found in local sampling or that detection implies a health risk. Area data describe typical ranges in sampled wells and cannot substitute for a certified laboratory analysis of your own water source. Additionally, detection of iron does not mean water is unsafe, nor does it indicate any violation of water quality standards. For households concerned about iron bacteria and related aesthetic effects, understanding your water’s unique profile is important before choosing equipment. The Pentair Iron Bacteria & Slime Filter ships ready to configure and can address iron bacteria concerns effectively based on your individual test results.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2017-09-28. 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 100ALVM aquifer (Shelby County): 10 results from 5 wells, median 16200.0 ug/L, range 2850.0-24500.0 ug/L; none above any federal threshold