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Arsenic Levels in Prince William County's Aquifer 370CMBR: A Homeowner's Reading

The aquifer labeled 370CMBR under Prince William County, VA, supplies groundwater to many residential wells. According to U.S. Geological Survey data collected from 2011 to 2025, arsenic was detected in 5 of 7 samples from three wells ranging 59 to 76 feet deep. These samples showed arsenic concentrations between 0.12 and 0.22 micrograms per liter, with a median value of 0.18 micrograms per liter. Notably, no measurements in this dataset were above federal safety thresholds for arsenic.

Household Signs That May or May Not Indicate Arsenic Presence

Arsenic in water does not usually cause immediate taste or odor changes, making it difficult to identify by household symptoms alone. Persistent water discoloration or unusual sediment is unlikely to be related to arsenic. Health-related symptoms attributed to arsenic exposure develop over long durations and require verified exposure levels through water testing rather than visual or sensory clues.

Understanding Terms: Detected, Median, and Range in Arsenic Sampling

In the government sampling data, 'detected' means the instrument found some arsenic at or above the reportable limit, while 'below the reporting limit' means levels were too low to quantify precisely. The 'median' is the middle value of all test results, which helps represent typical conditions, and 'range' covers the minimum and maximum values recorded. These terms describe the status of the sampled wells but do not define the arsenic content of any individual household’s water supply.

Potential Effects of Long-Term Arsenic Exposure Without Treatment

Arsenic is a naturally occurring element that can contaminate groundwater depending on local geology. If present at significant levels and not addressed, long-term ingestion has been linked in scientific studies to certain health risks. However, this depends on actual concentrations in the water used and the duration of exposure. Reliable water testing is essential to determine if action is warranted.

Difference Between Public Aquifer Sampling and Private Well Testing

Public aquifer sampling provides insights into general groundwater quality across an area but does not reflect specific conditions of any one household’s well. Localized factors such as well depth, construction, and nearby geology affect individual water quality. Testing your own well water through certified laboratory analysis is necessary to know precise arsenic levels relevant to your residence.

Steps to Identify Arsenic Concerns: From Basic Checks to Advanced Testing

Start by reviewing regional water quality reports like those from the USGS for initial context. Next, visually inspect your water and plumbing for unrelated issues that might mimic contamination symptoms. Then, collect a water sample following state guidelines and have it analyzed at a certified laboratory for arsenic concentration and other relevant parameters.

After confirming arsenic presence above desired levels, treatment technologies come into consideration. The Fleck Arsenic Filter ships ready to configure and uses proven methods to reduce arsenic in household water supplies.

In summary, Prince William County’s aquifer 370CMBR shows low arsenic levels based on government sampling, but individual well testing is necessary for accurate household assessment. Understanding sampling terms and symptoms helps homeowners decide when to test and consider treatment to ensure water quality over time.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2025-09-23. 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 370CMBR aquifer (Prince William County): 7 results from 3 wells, median 0.18 ug/L, range 0.12-0.22 ug/L; none above any federal threshold