The presence of arsenic in groundwater can be a concern for households relying on private wells in Lake County, Illinois, specifically drawing from aquifer 110QRNR. However, understanding what area-based government sampling data indicate—and what they cannot establish—is crucial when your existing water treatment equipment has failed to address arsenic effectively.
If you are a commercial or industrial user, then your questions differ from a household’s
While this page addresses residential concerns, commercial or industrial water users need additional data on arsenic levels tied to their specific water demands and regulatory requirements. These users typically require detailed testing, longer-term monitoring, and sometimes more complex treatment solutions tailored for larger volumes or process-specific needs that go beyond the scope of household water treatment.
If you want to understand the meaning of 'detected', 'median', and 'range' in the area arsenic data
The U.S. Geological Survey sampled three wells in this aquifer between June 2010 and August 2023, taking six measurements. Arsenic was detected in all samples, with levels ranging from 1.0 to 5.1 micrograms per liter and a median concentration of 1.55 micrograms per liter. Detection means the instrument found measurable arsenic; it does not imply a violation or unsafe condition. Importantly, no measurement exceeded federal arsenic thresholds set to protect health. These figures represent area trends and do not define the arsenic concentration in any individual household's well water.
If arsenic in your household water remains untreated over many years
Persistent arsenic presence in drinking water, even at low levels, may lead to long-term exposure concerns, supporting the need for informed decisions and proper water quality testing. Arsenic is a naturally occurring element that can dissolve into groundwater from rocks and soil. Without treatment, it may impact taste and staining, and over extended periods, exposure to elevated arsenic levels has been linked by health authorities to certain health risks. Testing your well water is the only way to determine your specific arsenic concentration and assess whether treatment is warranted or successful.
If you want to know how the documented technology works to address arsenic
The Pentair Arsenic Filter is a water treatment system designed to remove arsenic from household water supplies. It operates by filtering water to reduce arsenic concentrations to levels below health-based guidelines, helping protect your household from long-term exposure. The unit ships ready to configure, allowing you to set it up as part of your water system to restore arsenic treatment after previous equipment has failed.
If you are concerned about secondary aesthetic standards versus health-based limits
Aesthetic secondary standards concern taste, staining, and corrosion effects in water but are not health-based limits. For arsenic, federal health standards exist to limit exposure, but aesthetic considerations focus on factors like discoloration or deposits that affect household fixtures and appliances. The arsenic levels found in the sampled wells do not violate any federal health thresholds, though some households may notice minor aesthetic impacts if arsenic is present over time.
If you want to differentiate arsenic from commonly confused water issues
Arsenic is often mistaken for other naturally occurring elements such as iron or manganese, which can also cause taste or staining problems. Unlike these, arsenic is a metalloid with distinct health considerations and requires specific filtration technologies for effective reduction. Understanding this difference helps in selecting the correct treatment approach for your household water.
What you should not conclude from these area data: The regional arsenic measurements do not establish the arsenic level in your specific well or household water. Only a certified water test of your own supply can provide that information. Additionally, detection in the area does not mean your water is unsafe, nor does it guarantee your water lacks arsenic. Testing, combined with appropriate treatment like the Pentair Arsenic Filter, is the reliable approach to ensure your household water quality meets your expectations and safety standards.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2023-08-08. 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 110QRNR aquifer (Lake County): 6 results from 3 wells, median 1.55 ug/L, range 1.0-5.1 ug/L; none above any federal threshold