Government sampling conducted by the U.S. Geological Survey shows arsenic in Onslow County's 124CSLH aquifer ranges from 0.04 to 0.39 micrograms per liter (ug/L) with a median of 0.18 ug/L, based on 12 results from seven wells sampled between 2013 and 2024.
Myth: Untreated arsenic in water always leads to immediate health risks.
What the record shows is that the detected arsenic levels in Onslow County groundwater samples are well below federal thresholds. Arsenic can accumulate with long-term exposure, but these measurements suggest typical arsenic concentrations in the aquifer are low. Nonetheless, prolonged ingestion of any arsenic above minimal levels may warrant caution depending on usage and vulnerability.
Myth: You can choose treatment without knowing detailed water data from your own well.
The record emphasizes that well water can vary from the general area. Before selecting water treatment, homeowners should document their well depth and obtain their own water test results specifically measuring arsenic concentration. Only personal water analysis reveals the actual arsenic level to guide treatment decisions accurately.
Myth: All wells in the area deliver similar arsenic concentrations regardless of depth or source.
Samples supporting the area’s record come from wells between 85 and 298 feet deep. Deeper wells can tap different layers of the aquifer with varying arsenic levels. Thus, well depth and the geologic source influence expected arsenic presence and should be considered when evaluating treatment needs.
Myth: Plumbing materials and system age impact arsenic levels measured at the tap.
The USGS sampling focuses on groundwater directly from wells, so plumbing components don’t affect these arsenic measures. While plumbing can influence other water quality factors, arsenic in tap water primarily reflects the source water composition, apart from potential minor modifications by home plumbing materials.
Myth: 'Detected', 'median', and 'range' values represent exact and immediate risks for your water.
'Detected' means arsenic was measured in samples, but does not mean levels are unsafe or illegal. The 'median' is the middle value of all tests, not an average of your well’s water. The 'range' shows the lowest and highest measured values across sampled wells, not your specific well’s arsenic concentration.
Myth: A small number of samples fully represent arsenic levels for all wells in Onslow County’s aquifer.
The record is based on 12 analyses from seven wells, a relatively small sample for a large area. This limited dataset provides an initial understanding but should not replace personal well testing. Variability means your well's arsenic could differ from area medians.
This information covers the U.S. Geological Survey groundwater sampling results for arsenic in the Onslow County aquifer 124CSLH area. For detailed water analysis and to address specific household needs, consider testing your own well water. The Pentair Arsenic Filter system ships ready to configure and offers a documented solution tailored to remove arsenic from residential water supplies consistent with local aquifer data.
Source of government data: USGS monitoring location 344244077135801
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-07-26. 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 Arsenic in the 124CSLH aquifer (Onslow County): 12 results from 7 wells, median 0.18 ug/L, range 0.04-0.39 ug/L; none above any federal threshold
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