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Understanding a Laboratory Report for Total Dissolved Solids in Groundwater

A typical laboratory report for total dissolved solids (TDS) in well water provides measured values usually expressed in milligrams per liter (mg/L). It records the concentration of dissolved organic and inorganic substances, which can influence taste, staining, and pipe scale formation. The report lists specific numeric results from water samples collected at a certain depth or location, but the report itself does not diagnose safety or compliance; instead, it informs whether water treatment should be considered.

Reading Median and Range in Somerset County's Aquifer 112SRFD Sampling

According to U.S. Geological Survey sampling of aquifer 112SRFD in Somerset County, six groundwater samples taken from wells 75 feet deep show a median TDS of 48.5 mg/L, with a range between 0.06 and 54.0 mg/L. This means half the recorded samples measured TDS near 48.5 mg/L, while individual samples varied from nearly none detected up to 54.0 mg/L. For a homeowner, these figures suggest moderate levels of dissolved solids that are typical in this aquifer but do not inherently signal a problem that requires treatment.

Public-System Sampling Versus Private Well Testing

The public USGS data represents a small set of wells in the aquifer, not individual private wells. While these give a general sense of water characteristics in the area, they do not reflect the specific conditions of a homeowner’s private well, which can have unique local influences. Private testing is necessary to establish the exact concentration of dissolved solids in your own water supply. Public data helps guide whether detailed private testing and treatment might be warranted.

The Meaning of 'Detected', 'Median', and 'Range' in These Records

In the Somerset County aquifer data, 'detected' indicates that TDS was measurable in all six samples, with none falling below the reporting limit. The median value summarizes the central tendency, and the range shows variability over time or location among samples. None of the results exceeded federal aesthetic secondary standards for TDS, which are thresholds related to taste and staining rather than health risks. Therefore, these detections do not imply unsafe conditions.

Stepwise Approach: From Simple Checks to Laboratory Testing

Before investing in treatment equipment, consider simple observational checks such as noting taste changes or staining on fixtures. If these are present, the next step is to have your private well water tested by a certified laboratory for total dissolved solids and related parameters. This step confirms whether treatment is necessary. The public data provides context but does not replace personal water testing.

Seasonal and Multi-Year Variation in the Somerset County Record

The six samples were collected over an eight-year span from 2011 to 2019, capturing some seasonal and annual variability. The relatively narrow range suggests stable conditions in this aquifer section. Understanding this helps rule out sudden spikes or declines in dissolved solids and supports relying on periodic private testing to monitor long-term trends in your well.

Distinguishing Total Dissolved Solids from Other Water Quality Factors

Total dissolved solids represent all dissolved substances combined and differ from individual constituents like iron or hardness minerals. While TDS affects taste, corrosion, and staining potential, it is not a direct health indicator. This distinguishes it from microbial contamination or heavy metals, which require different testing and treatment approaches.

Deciding Which Laboratory Test to Order to Determine Treatment Need

The single most informative analysis is a certified laboratory test for total dissolved solids on a fresh sample from your private well. If this test shows TDS levels approaching or exceeding local aesthetic thresholds, treatment with a system rated for substantial grain capacity, such as the Autotrol Complete Well System with 32,000 grains capacity, may help mitigate related issues. This direct measurement is essential for making an informed choice between competing treatment options for your household.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2019-09-24. 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 112SRFD aquifer (Somerset County): 6 results from 1 wells, median 48.5 mg/L, range 0.06-54.0 mg/L; none above any federal threshold