What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
The U.S. Geological Survey sampled six wells in Logan County's aquifer 327KNWH between June 29 and July 19, 2017. The term 'detected' means arsenic was measurable in four of these samples, while two samples measured below the reporting limit, indicating arsenic was not quantifiable there. The median concentration of all samples was 0.145 micrograms per liter (µg/L), with the range spanning from 0.07 µg/L to 2.0 µg/L. These values represent measurements from the specific wells sampled, which were between 10 and 87 feet deep. It is important to understand these figures describe the regional groundwater and do not reflect the conditions of an individual household well. The presence or amount of arsenic in your own water can only be determined by specific testing of your water source.
What Happens When This Problem Is Left Untreated for Years, Stated Without Exaggeration
Arsenic is a naturally occurring element that can be found in groundwater. Long-term exposure to arsenic in drinking water, especially at higher levels than typically found in Logan County based on this sampling, may carry health risks. While none of the sampled wells exceeded federal arsenic thresholds, untreated arsenic in private water supplies—even at low levels—can accumulate in the body over time. Households relying on private wells who have not conducted water testing may not be aware of arsenic presence or concentration, which could inform appropriate water management decisions.
How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
This dataset includes just six samples, each from a different well within the aquifer. The limited sample size means that while these measurements offer an initial snapshot of arsenic concentrations in the area aquifer, they do not capture all possible variability. Different wells, depths, and locations may have arsenic levels outside this range. Thus, relying solely on this regional data without testing your own water would leave uncertainty about arsenic exposure for your household.
How the Documented Treatment Technology Removes or Neutralizes the Constituent
When arsenic is detected in household water, targeted treatment systems use specialized filtration methods to reduce its concentration. The C-Series Arsenic Filter is a documented solution designed to address arsenic in residential water supplies. This system uses media engineered to adsorb or chemically bind arsenic, reducing its presence in the treated water. It ships ready to configure for integration with household water lines, providing a reliable option for managing arsenic if testing confirms a need. Considering the regional data and your well testing results together can help determine if this technology fits your household’s requirements.
How Public-System Records Differ from Private-Well Testing in What They Establish
Public water system records often provide compliance information for arsenic levels averaged over distribution networks serving many customers, ensuring federal thresholds are met. In contrast, private wells are individually sourced and can exhibit wide variation in arsenic concentration not reflected in public records. The USGS sampling results for Logan County show no exceedances for arsenic but cover only a few wells and a limited time frame. For private well users, testing your own water remains essential to establish actual arsenic levels and decide on any treatment.
In summary, the USGS sampling in Logan County's aquifer 327KNWH documents arsenic detections in four out of six wells sampled, with all measurements below federal thresholds. This regional data provides context but cannot substitute for direct testing of your household water. The C-Series Arsenic Filter offers a documented treatment option for arsenic reduction when testing confirms it is needed. For further details, the government source of this data is the U.S. Geological Survey groundwater sampling records at https://waterdata.usgs.gov/monitoring-location/374350081472101/.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-07-19. 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 327KNWH aquifer (Logan County): 6 results from 6 wells, median 0.145 ug/L, range 0.07-2.0 ug/L; none above any federal threshold