What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
The U.S. Geological Survey (USGS) sampled groundwater in Dakota County's aquifer 110SAGR from 2014 to 2022. Their data show fluoride was detected in all six results from four wells between 80 and 260 feet deep. The median fluoride concentration was 0.39 mg/L, with observed values ranging from 0.17 to 1.59 mg/L. 'Detected' means the instrument measured fluoride present in the samples. The 'median' is the middle value of all measurements, giving a typical measure for the area, and the 'range' indicates the lowest and highest fluoride levels found in this sampling. None of these results exceeded any federal health-based fluoride limits.
How Sample Depth, Well Depth or Source Type Changes What a Reader Should Expect
The fluoride levels reported come from wells of significant depth (80 to 260 feet) in the specified aquifer. Water drawn from shallower or deeper wells, or from other sources, may have different fluoride concentrations. Geographic and geological variations can affect fluoride presence, so the USGS data reflect average regional conditions rather than a specific household's water quality. Understanding your own well's depth and water source helps set expectations but does not substitute for testing your water directly.
What a Certified Laboratory Test for This Constituent Reports and How to Read It
To know your household's fluoride concentration exactly, a certified laboratory test of your well or tap water is needed. Such tests will report fluoride levels in milligrams per liter (mg/L). When reading your test, compare the value to federal standards, noting that a detected fluoride concentration below limits is common and not a violation. Test results clarify whether regional averages apply to your water or if local conditions differ significantly.
What Happens When This Problem Is Left Untreated for Years, Stated Without Exaggeration
Fluoride is naturally present in water but in varying amounts. Long-term exposure to fluoride at levels significantly above recommended limits can affect dental and bone health; however, the sampled wells in Dakota County’s aquifer fall well below regulatory thresholds. If your household water contains higher fluoride concentrations, over many years minerals may accumulate or affect taste, but the data here do not indicate such issues for the area broadly. Confirming your water’s condition through testing is essential to assess personal exposure.
Maintenance Rhythm of the Documented Technology in Plain Terms
The C-Series Fluoride Filter system ships ready to configure for residential use and is designed to reduce fluoride levels effectively. To maintain performance, the filter media requires periodic replacement, typically following manufacturer guidance based on volume treated and time in use. Routine monitoring of water quality at home will ensure the system functions as expected in managing fluoride.
For households in Dakota County uncertain about fluoride levels, the C-Series Fluoride Filter offers a documented option to address detected fluoride according to your own water’s test results.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2022-09-13. 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 Fluoride in the 110SAGR aquifer (Dakota County): 6 results from 4 wells, median 0.39 mg/L, range 0.17-1.59 mg/L; none above any federal threshold