How many samples and wells stand behind the figures, and what a small sample means
The water quality figures for Linn County’s aquifer 111ALVM come from 246 iron concentration results collected between March 2010 and June 2026. These samples were taken from 16 different wells, all placed at depths between 18 and 74 feet. This dataset provides a regional snapshot of iron levels in groundwater, offering valuable context for homeowners who rely on wells drawing from this aquifer.
However, it is important to note that these figures represent an area aggregate, not the specific measurement of any individual household well. Individual wells can vary widely due to local geology, well depth, and construction. Therefore, while the regional data is a helpful reference, it cannot replace testing your own well water to determine its exact characteristics.
A worked example: reading the record's median and range as a homeowner would
The median iron concentration from sampling in this area is 54.8 micrograms per liter (µg/L), with results ranging from 3.5 to 800 µg/L. This means that half the samples had iron levels below about 55 µg/L, while some wells showed much higher concentrations up to 800 µg/L. Iron is a naturally occurring mineral in groundwater that can affect water appearance and taste, causing reddish staining or metallic flavor if levels are elevated.
Understanding this range helps homeowners anticipate possible iron issues in their well water but does not define their own water quality. Only a direct well water test can provide actual concentrations and reveal whether treatment is advisable.
How public-system records differ from private-well testing in what they establish
Regional groundwater data from public sources offers broad insight into aquifer characteristics but does not substitute for private well testing. Public records report the presence and concentration range of constituents like iron across multiple wells but cannot diagnose particular household water conditions.
Private well testing measures the water your home uses and identifies specific treatment needs. This is critical because treatment decisions depend on the actual mineral and contaminant levels in your water, not just regional averages or medians.
How seasonal or multi-year variation shows in the record (dates and ranges given)
The available data spans over 16 years, from 2010 through mid-2026, reflecting iron concentrations through various seasons and hydrologic conditions. Iron levels can fluctuate seasonally and annually due to changes in groundwater chemistry and recharge patterns.
This broad timeframe helps capture variability but does not forecast precise fluctuations in any individual well. Homeowners may observe changes in water appearance or taste during different times of year, underscoring the value of repeated or periodic testing.
What happens when this problem is left untreated for years, stated without exaggeration
Iron in well water is primarily an aesthetic concern rather than a health risk at levels recorded in Linn County’s aquifer 111ALVM. Untreated iron can cause staining on fixtures, laundry, and plumbing surfaces and produce metallic taste or odor. Over time, iron deposits may build up in pipes and water-using appliances, potentially reducing efficiency or increasing maintenance needs.
Addressing iron concerns promptly can prevent these issues and improve water quality in everyday household use.
The documented solution tied to demand for treatment capacity
For households deciding on effective complete well water treatment, the Fleck Complete Well System offers a reliable solution. Designed with a 32,000 grain capacity, this system manages iron alongside other common well water constituents. It ships ready to configure for your water system, allowing you to tailor treatment to your test results and household water demand.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2026-06-23. 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 111ALVM aquifer (Linn County): 246 results from 16 wells, median 54.8 ug/L, range 3.5-800.0 ug/L; none above any federal threshold
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