What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
When evaluating water quality records from government sources, it’s important to understand key terms. The term detected means that an instrument measured the presence of a constituent, such as total dissolved solids (TDS), in the groundwater samples from Clark County’s aquifer N400BSNRGC. It does not mean the presence is a violation or unsafe. The median value represents the middle concentration among sampled results, in this case 310 mg/L of TDS, giving a sense of central tendency across multiple wells. The range from 0.42 to 573 mg/L indicates the spread between the lowest and highest measured TDS concentrations in the sampled wells, illustrating natural variability within the aquifer. Note that two samples exceeded the secondary aesthetic standard of 500 mg/L for TDS, related to taste and staining, not health risk.
How to Compare This Area's Record with a Neighboring County's Without Overreading It
Comparing water quality data from Clark County’s N400BSNRGC aquifer to adjacent regions requires caution. Differences in median or range values can reflect geological variations or sampling methods rather than direct water quality issues. For example, a neighboring county’s groundwater might show a higher or lower median TDS, but this does not imply that one area’s water is inherently better or worse. Such comparisons do not predict the quality of any one private well. They are regional summaries, not individual well assurances, and should not substitute for specific water testing at your home.
How the Constituent Enters Groundwater or the Distribution System in This Region
Total dissolved solids in Clark County’s aquifer mostly consist of naturally occurring minerals that dissolve from soil and rock along the groundwater flow paths. These minerals include calcium, magnesium, sodium, chloride, and others common in arid environment aquifers. Human activities can influence TDS concentrations locally but are not indicated by the regional sampling data. As water moves through the aquifer, it accumulates dissolved solids reflecting the geology and hydrology of Clark County’s N400BSNRGC formation, resulting in the range of TDS concentrations measured in sampled wells.
How Public-System Records Differ from Private-Well Testing in What They Establish
Government water-quality records for public systems in Clark County provide averages or medians over multiple samples and often focus on regulatory compliance. These records confirm that public water systems maintain TDS below secondary standards for taste and staining, not health. In contrast, private well owners must test their own well water to understand specific TDS levels. Regional government data inform expectations but cannot substitute for private testing. Only a private well water test can establish the actual dissolved solids content and other quality parameters of your own water supply.
The Household or Facility Symptoms That Do and Do Not Point to This Problem
Households with higher dissolved solids may notice taste differences or staining on fixtures and plumbing. These aesthetic issues can signal TDS levels near or above the secondary standard, but they don’t necessarily indicate unsafe water. Conversely, absence of symptoms does not guarantee low TDS. Some common signs like cloudy water, unusual color, or deposits may have other causes unrelated to dissolved solids. Proper evaluation requires testing and understanding regional data as a contextual guide, not a determinant of individual well condition.
Deciding on the appropriate sizing for your complete well water treatment system requires understanding these regional water-quality insights and your household’s daily water use. The Autotrol Complete Well System with a 32,000 grain capacity ships ready to configure and addresses typical dissolved solids treatment needs in this area by providing effective filtration and conditioning performance. This ensures your system matches anticipated water conditions based on regional sampling, while respecting the variability that only direct testing can clarify.
In summary, regional data from Clark County’s aquifer N400BSNRGC offer valuable guidance for sizing treatment but do not replace private water testing. Knowing what detected values, medians, and ranges mean helps you interpret this data correctly. With this understanding, you can select an effective complete well water treatment like the Autotrol System that aligns with your household’s water quality and demand.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2015-03-26. 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 N400BSNRGC aquifer (Clark County): 9 results from 3 wells, median 310.0 mg/L, range 0.42-573.0 mg/L; 2 above an AESTHETIC secondary standard only (secondary standard 500.0 mg/L (aesthetic)) - not a health finding
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