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If your residential well in St. Mary's County taps the aquifer identified as 125AQUI, you might notice an unfamiliar taste or slight mineral deposits around your fixtures. These clues relate to the total dissolved solids (TDS) content in your water, a key factor to consider when sizing a complete well water treatment system.

1. Understanding Certified Laboratory Test Reports for TDS

A certified lab test for TDS measures the concentration of dissolved minerals and salts in your water, expressed in milligrams per liter (mg/L). The test reports a specific numeric value indicating the total amount of these solids dissolved in your well water. This measurement is a direct analysis of your water sample and is essential for determining the appropriate capacity of a water treatment system to handle your household's needs.

2. Differentiating Aesthetic Secondary Standards from Health-Based Limits for TDS

It is important to note that TDS is governed by aesthetic secondary standards rather than health-based limits. These secondary standards guide taste, staining, and corrosivity qualities of water rather than safety. Being above a certain threshold does not imply your water is unsafe. For St. Mary's County aquifer 125AQUI, no federal health-based limits were exceeded in the groundwater samples recorded. Consequently, TDS levels primarily affect water's appearance and taste, critical factors when considering treatment but not health risks.

3. Applying the Regional Median and Range of TDS to Your Home Water Assessment

The U.S. Geological Survey sampled three wells in this aquifer area between May and June 2011, reporting nine results total. The median TDS was 142.0 mg/L, with individual results ranging from 0.17 to 302.0 mg/L. Interpreting these figures as a homeowner means expecting moderate variability in mineral content—some deeper wells yielded higher readings while others were quite low. Your own well water’s TDS could fall anywhere in this range. Understanding this helps when selecting a treatment system sized to handle typical fluctuations without overload.

4. Evaluating the Number of Samples and Wells Behind the TDS Figures and Their Implications

The TDS data for this aquifer is based on nine results from three wells sampled over a one-month period. While this provides useful area-wide insights, it reflects limited scope. A smaller sample size may miss rarer water quality extremes. Hence, a direct test of your specific well water remains essential. This regional dataset sets reasonable expectations for TDS but should not replace your water analysis when deciding treatment capacity.

5. Comparing St. Mary's County TDS Data with Neighboring Counties Without Overreading

When comparing this area's results to neighboring counties, pay attention to differences in median and range values, well depths, and sampling times. Avoid assuming uniform water quality despite geographical closeness. Regional trends help anticipate typical water conditions and treatment demands but cannot substitute for your unique well conditions or water test outcomes.

Once you have tested your well water and noted your household's daily water use, the Fleck Complete Well System offers a direct-purchase solution with a 32,000-grain capacity designed to address the mineral content variability typical of St. Mary's County aquifer 125AQUI waters. This system ships ready to configure for your specific requirements, supporting a comprehensive approach to complete well water treatment tailored to your household.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2011-06-14. 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 125AQUI aquifer (St. Mary's County): 9 results from 3 wells, median 142.0 mg/L, range 0.17-302.0 mg/L; none above any federal threshold