What do 'detected', 'median', and 'range' mean in the sampling record on this page?
The U.S. Geological Survey sampled groundwater in Cumberland County’s aquifer 112OTSH between 2015 and 2017, reporting hardness levels as calcium and magnesium concentrations. All four sampled results detected hardness, with none below reporting limits. The 'median' value of 29.65 mg/L represents the middle concentration among the samples, while the 'range' from 22.0 to 88.0 mg/L shows the lowest and highest hardness measured in the area. These figures describe the hardness in sampled wells, not specific private wells or tap water.
How does seasonal or multi-year variation show in the record?
Sampling dates span over two years—from June 2015 to October 2017. This multi-year range helps capture natural fluctuations in groundwater hardness due to seasonal changes or hydrological patterns. The range between 22.0 and 88.0 mg/L suggests variability that could result from factors like rainfall, recharge, or aquifer interactions. Large homes drawing from the same aquifer might experience these variations, emphasizing the value of periodic testing for accurate water treatment planning.
How should a homeowner read the median and range in this record?
Imagine you are reviewing this data as a property owner considering water treatment: the median hardness of 29.65 mg/L implies that half of the sampled hardness measurements fall below this level and half above it within the reported range. The maximum measured hardness of 88.0 mg/L approaches moderate hardness levels known to cause typical hard water effects such as scale formation or reduced soap efficiency. Understanding this spread helps gauge the potential severity of hard water and the need for tailored treatment strategies.
What is the recommended order to rule things out, from the cheapest check to laboratory test?
Start by visually inspecting water-using equipment for signs of scale buildup or spotting, which can indicate hard water effects. Next, simple test kits available commercially can provide a preliminary hardness estimate. For a definitive and actionable result, a certified laboratory test for hardness—measuring calcium and magnesium—is recommended. This test clarifies your actual water condition compared to the area data and informs commercial-grade treatment decisions.
How do sample depth, well depth, or source type affect expectations?
The sampled wells ranged from 22 to 38 feet deep, representing shallow groundwater in the area aquifer. Well depth can influence water chemistry; shallower wells might show more variation influenced by surface conditions, whereas deeper wells often have more stable chemistry. Large commercial systems should consider their specific well depth when evaluating treatment needs, as hardness levels can differ from the area median and range depending on source characteristics.
What does a certified laboratory test report for hardness and how should it be read?
A certified lab test for hardness reports concentrations of calcium and magnesium ions, expressed in mg/L, much like the government data. The results specify actual conditions for your well or water source, allowing you to compare against regional data. Since hardness is not a health concern but an aesthetic and operational factor, the test helps determine whether treatment is necessary to prevent equipment scaling or reduce detergent use in a commercial setting.
What this page’s area data does not establish: The hardness measurements here describe sampled wells in Cumberland County's aquifer 112OTSH and should not be assumed to represent your property’s water directly. Detection of hardness at these levels is common and does not indicate a violation of any federal health standard. To know your actual hardness level, a direct water sample from your well or tap and certified testing is essential. Once known, commercial operators can consider options such as the 42 Steel Tanks - Single Unit Skid forTr, designed for water hardness control in large facilities and available for direct purchase, shipped ready to configure for your system's needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-10-05. 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 Hardness, Ca, Mg in the 112OTSH aquifer (Cumberland County): 4 results from 2 wells, median 29.65 mg/L, range 22.0-88.0 mg/L; none above any federal threshold