What 'Detected', 'Median', and 'Range' Mean in the Sampling Record on This Page
The U.S. Geological Survey collected groundwater data in Marshall County, Kentucky, specifically targeting the county's aquifer that supplies many private wells. In three results from a single well sampled on one day in 2013, total dissolved solids (TDS) were detected in all samples, meaning instruments measured these solids without exception, but no sample was below their detection limit. The median TDS—the middle value among the measurements—was 51.0 mg/L, while the range spanned from 0.07 mg/L to 55.0 mg/L. These numbers describe the general water quality picture for this aquifer area; they do not represent your well's exact condition without a dedicated test.
How the Constituent Enters Groundwater or the Distribution System in This Region
Total dissolved solids comprise a variety of minerals and organic matter naturally present in groundwater. In Marshall County’s aquifer, TDS mainly come from rock and soil minerals dissolving into the water as it moves through underground layers. Seasonal changes, rainfall, and geological formations influence TDS levels. Human activities, such as agriculture and land use, can also impact mineral content but vary widely depending on precise location. As a result, the TDS you measure at your well depends on where and how deep it taps into this aquifer.
Why Aesthetic Secondary Standards Differ from Health-Based Limits, Applied to This Constituent
TDS is governed by aesthetic secondary standards that relate to taste, odor, and potential staining or corrosivity. These standards describe what concentrations may affect water’s appearance or convenience but do not set safety limits. Federal health-based limits do not apply to TDS specifically because it is not a direct health hazard. The Marshall County aquifer samples showed none above any federal threshold for TDS or related constituents. This means water from this aquifer generally poses no known health risk from dissolved solids alone, though aesthetics might vary.
How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The data here come from only three samples taken from a single well at a fixed depth of about 202 feet, all on the same day. This small sample size means the recorded median and range provide a snapshot rather than a comprehensive view of the whole county aquifer. Aquifer conditions can vary widely across the area and over time. For an individual well, localized geology, deeper or shallower drilling, and seasonal variations can cause different results. Thus, these figures are a starting point but not definitive for any one household.
The Order in Which to Rule Things Out, from Cheapest Check to Laboratory Test
Begin by reviewing any existing water quality reports or previous tests if available. Check for noticeable taste, staining, or scale buildup, which can hint at TDS-related effects. Next, simple home water test kits can screen for TDS but lack precision. The most reliable way to know your well’s TDS is to collect a water sample and send it to a certified laboratory for analysis. This method clarifies how your water compares to regional findings and secondary standard guidelines.
What a Certified Laboratory Test for This Constituent Reports and How to Read It
A certified lab test quantifies the total dissolved solids in milligrams per liter (mg/L), listing the exact concentration found in your water sample. The lab report usually compares values to recognized guidelines, noting whether TDS is above or below thresholds related to taste or corrosion potential. Since TDS is a sum of minerals rather than a single contaminant, this number helps decide if treatment is desirable for aesthetics or equipment protection, not safety. Understanding your lab result in the context of regional data helps determine if a treatment system is warranted.
In summary, regional groundwater sampling in Marshall County shows low to moderate total dissolved solids levels in the aquifer supplying many wells. These results do not diagnose your own water, which requires direct testing. Starting with basic checks and moving to certified laboratory tests will guide you in choosing the right class of water treatment. If mineral removal is needed to address TDS concerns, the Fleck Complete Well System, with its 32,000-grain capacity, ships ready to configure and can effectively manage these dissolved solids for residential wells.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-09-18. 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 Total dissolved solids in the aquifer (Marshall County): 3 results from 1 wells, median 51.0 mg/L, range 0.07-55.0 mg/L; none above any federal threshold
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