Pentair Arsenic Filter

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How Arsenic Enters Groundwater in Hillsborough County

In Hillsborough County, New Hampshire, arsenic primarily enters the groundwater through natural geological processes. The aquifers underlying the area contain minerals that can release trace amounts of arsenic into the water over time. This occurs as groundwater moves through rocks and sediment, dissolving arsenic-bearing minerals. Additionally, historical land use activities could influence localized arsenic levels, but the regional presence is mainly geogenic. Understanding this natural occurrence is essential when considering water treatment, as arsenic is not introduced through municipal treatment or distribution but stems from the source water itself.

Interpreting Measured Arsenic Levels and Federal Standards

Government sampling conducted by the U.S. Geological Survey collected 48 results from 44 separate wells in the Hillsborough County aquifer between December 2021 and April 2022. Arsenic was detected in 41 samples, with concentrations ranging from 0.2 to 126.0 micrograms per liter (µg/L), and a median level of 3.3 µg/L. None of these measurements exceeded federal thresholds established for arsenic in drinking water. It is important to note that a detection of arsenic does not equate to a violation or necessarily indicate unsafe water. Rather, it reflects the sensitivity of measurement instruments and regional geochemistry. Federal standards are health-based limits set to guide safety; the absence of exceedances suggests compliance in the sampled wells but does not guarantee any individual well’s condition.

Reading the Region’s Median and Range as a Homeowner

As a homeowner evaluating your own water quality, the USGS data serve as a regional reference but cannot define your specific well water. The median arsenic concentration of 3.3 µg/L means that half the sampled wells had readings below this level, and half above. The range indicates variability across the area, from very low (0.2 µg/L) to relatively higher (126.0 µg/L). Your well may fall anywhere within or outside this range, underscoring the importance of a direct laboratory test on your water supply. This information can help you gauge how your individual arsenic level compares to the broader regional context reported by government sampling.

Differences Between Public System Records and Private Well Testing

Public water systems are monitored regularly and must comply with federal arsenic standards, with results publicly reported. These records reflect the quality of treated water distributed to consumers but do not apply to private wells. Private wells in Hillsborough County are not subject to mandatory testing or regulation, so their arsenic content can vary significantly. Government aquifer sampling provides an overview of untreated groundwater conditions but cannot substitute for a specific test on your well water. Therefore, private well owners are advised to perform their own arsenic analysis to understand their exposure accurately.

Fixtures, Appliances, and Processes Most Affected by Arsenic

Arsenic in water primarily impacts drinking and cooking water quality, and it can accumulate over time in fixtures and appliances. Because arsenic is a dissolved contaminant, devices such as water filters that remove arsenic protect taps and faucets from deposits. The kitchen faucet and water used for food preparation are most directly involved. Additionally, water-using appliances like coffee makers or humidifiers may be influenced if arsenic concentrations are elevated, although arsenic does not typically cause staining or mechanical damage. Addressing arsenic concerns often centers on ensuring safe drinking water through effective filtration tailored to the household’s needs.

For those weighing treatment options based on measured arsenic demand, the Pentair Arsenic Filter provides a documented technology that ships ready to configure. It is designed specifically to address arsenic removal from residential water supplies, helping households in Hillsborough County manage this groundwater characteristic effectively according to their water test results.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2022-04-25. 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 (Hillsborough County): 48 results from 44 wells, median 3.3 ug/L, range 0.2-126.0 ug/L; none above any federal threshold