Government sampling by the U.S. Geological Survey recorded arsenic in every sample tested from Rockingham County's aquifer area, with a median concentration of 2.0 micrograms per liter and a range stretching from 0.1 to 150.0 micrograms per liter gathered between December 2021 and February 2022.
How Does Filtration Alter Your Tap Water When Arsenic Is Present?
Using a Pentair Arsenic Filter in your home changes the quality of your tap water by reducing arsenic concentrations to levels compliant with federal guidelines. The system ships ready to configure, providing a treatment solution that targets arsenic specifically. This treatment differs from untreated water by lowering dissolved arsenic that may otherwise be present, contributing to peace of mind about water quality.
What Do Terms Like ‘Detected,’ ‘Median,’ and ‘Range’ Mean in the Sampling Data?
‘Detected’ means arsenic was measurable in every one of the 43 samples taken from 37 separate wells, indicating it is commonly present in the aquifer. The ‘median’ of 2.0 micrograms per liter represents the middle value, with half the samples above and half below this level. The ‘range’ from 0.1 to 150.0 micrograms per liter shows the lowest measured to the highest, demonstrating spatial variation across sampled wells. However, these figures do not describe arsenic in your specific water; only a direct test of your household supply can do that.
What Does the Measured Arsenic Range Imply Compared to Federal Standards?
The federal standard for arsenic in drinking water is 10 micrograms per liter. None of the Rockingham County samples exceeded this threshold during the sampling period. This means area aquifer wells sampled do not show arsenic levels above the federal benchmark. However, a detected value below this standard is not a violation or health risk by regulation. It is a measurement that guides awareness and potential treatment decisions.
What Steps Should You Take to Determine Your Household Water’s Arsenic Level?
- First, confirm your water source type and consult any existing reports or water quality statements you have.
- Consider simple visual or taste assessments, though arsenic itself is tasteless and odorless, so this is limited.
- The most definitive step is to have your household water tested by an accredited laboratory for arsenic concentration specifically.
These steps help distinguish whether the regional data applies to your well or supply and inform appropriate treatment.
Does Arsenic Concentration in Rockingham County Vary Over Time?
The USGS sampling occurred over winter months from December 2021 through February 2022. While this provides a snapshot of arsenic presence, groundwater chemistry can show seasonal and multi-year variation. The recorded range in this period reflects spatial differences more than temporal fluctuations. For ongoing assurance, occasional retesting is recommended to detect any changes in concentration over time.
What Additional Considerations Do Commercial or Industrial Users Have Beyond Household Concerns?
Commercial and industrial water users may need to assess arsenic impacts on larger scale operations, including regulatory compliance, process water quality, and potential effects on equipment or product. They often require higher-capacity filtration and tailored monitoring protocols. Households generally focus on health-based testing and appropriate treatment capacity for daily use.
This page has detailed what the U.S. Geological Survey data for Rockingham County’s aquifer shows about arsenic—what it measures and the limits it respects. It clarified how to interpret these regional findings without assuming your own water’s condition and offered the logical order of checks to confirm household water safety. Treatment with a Pentair Arsenic Filter offers a targeted option to reduce arsenic if your tests indicate it is warranted.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2022-02-22. 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 Arsenic in the aquifer (Rockingham County): 43 results from 37 wells, median 2.0 ug/L, range 0.1-150.0 ug/L; none above any federal threshold
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