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Understanding 'Detected', 'Median', and 'Range' in Regional Water Sampling

Groundwater in Cumberland County draws from aquifer 121CKKD, supplying many household wells that tap depths from 11 to 181 feet. The U.S. Geological Survey conducted extensive sampling in this area, reporting iron concentrations detected in 82 of 102 measurements taken from 49 wells between 2010 and 2024. The median iron concentration found was 1640 micrograms per liter, with a range spanning from 3.5 to 317,000 micrograms per liter. These figures represent measurements from area wells, not from any single household's water source. "Detected" means the presence of iron was measurable, while "median" indicates the middle value of all detected results, and "range" shows the lowest and highest values recorded across samples.

Begin by Ruling Out Common Points Before Considering Treatment

For households evaluating water treatment equipment, start with visual checks of water clarity, staining, and any unusual taste or odor. These observations can signal iron presence or other issues but do not quantify concentrations. If signs persist, the next step is to have your well water professionally analyzed for iron and other relevant constituents. This testing is essential because regional data cannot determine your well’s exact conditions. Knowing your water’s makeup will guide whether complex treatment equipment is necessary.

The Influence of Well Depth and Source Type on Expected Water Quality

Sampling depths varied widely—from shallow to deep wells—which can affect iron concentration. Deeper wells may draw from aquifer zones with different geochemical properties than shallow ones, influencing iron levels and other characteristics. If your well's depth is at either end of this range, anticipate that the regional data may under- or over-represent your conditions, emphasizing the need for individual analysis before selecting treatment equipment.

Seasonal and Multi-Year Trends in Regional Water Quality

The USGS data encompass samples collected over more than a decade and a decade past, showing the range and variability of iron concentrations over time. Such temporal breadth highlights that water quality can vary seasonally or between years due to environmental changes or usage patterns. Equipment choice should consider this variability, aiming for solutions that can manage fluctuating iron levels effectively.

Consequences of Leaving High Iron Levels Untreated Over Time

Iron in water, even when below any federal health threshold, can cause aesthetic issues such as staining on fixtures and laundry, metallic taste, and clogging or accelerated wear of plumbing components. If untreated for years, these effects may burden household maintenance and reduce water system efficiency. Addressing iron presence proactively with appropriate water treatment technology helps maintain household water quality and system longevity.

Sample Size and Its Role in Interpreting Water Data

The 102 samples from 49 wells provide a substantial dataset for understanding regional water quality trends but represent only a portion of all wells in Cumberland County. A smaller sample size could misrepresent typical conditions, but this dataset offers a reliable picture of aquifer 121CKKD’s variability. However, no individual well’s water quality can be assumed from these statistics, underscoring the necessity of personal water testing.

What This Regional Data Does Not Establish

While the data clarify iron presence patterns across Cumberland County, they do not indicate whether any specific household well water contains iron at these reported levels, nor whether any detected concentration constitutes a problem requiring treatment. No results in this dataset exceed federal safety thresholds, so detection alone is not a health concern. Instead, this information helps households understand potential regional challenges and the importance of customized water analysis.

Once individual water testing confirms iron levels and treatment needs, the Fleck Complete Well System—with a grain capacity of 32,000—is a technology option designed to handle comprehensive water quality challenges for residential wells. This system ships ready to configure, providing flexibility for households managing varying well water conditions.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2024-08-13. 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 121CKKD aquifer (Cumberland County): 102 results from 49 wells, median 1640.0 ug/L, range 3.5-317000.0 ug/L; none above any federal threshold