Seasonal and Multi-Year Variation in Uranium Measurements
Groundwater wells in Arapahoe County tapping aquifer 211FXHL have undergone uranium sampling from April 2010 through September 2025. Thirty results from two distinct wells, sampled at depths between 60 and 75 feet, show uranium levels consistently detected. The median uranium concentration across these samples is 0.1255 micrograms per liter (µg/L), with results ranging from 0.107 to 0.168 µg/L. Four samples registered below the reporting limit, indicating uranium was undetectable in those instances. Importantly, none of these findings exceed federal standards for uranium concentration in drinking water. This dataset reflects multiple years and seasons, offering a reliable baseline for the typical uranium presence in groundwater from this aquifer.
Changes to Household Water Quality After Treatment
When uranium and radium are present in groundwater, they become part of the water reaching household taps unless effectively removed. Employing a targeted water treatment system, like the Fleck Uranium & Radium System, results in a substantial reduction of these constituents, improving water quality for residential use. After configuring this system, users typically find uranium and radium levels lowered below detection in their household water samples, consistent with the product's capacity to treat up to 32,000 grains. This change is measurable by certified laboratory testing of the water before and after passing through the system.
Steps to Assess Your Water Quality and Treatment Needs
Before selecting or using any treatment, the following sequence helps clarify the situation and avoid unnecessary expense:
- Visual and Sensory Checks: Confirm any changes in water appearance or taste, though uranium and radium do not usually alter aesthetics noticeably.
- Existing Equipment Status: Since equipment failure is the current concern, evaluate if the existing system is not functioning as designed or if components have degraded.
- Local Water Quality Review: Reference government data such as those presented here for an understanding of regional uranium levels.
- Laboratory Water Testing: Obtain current test results from your own water source to determine uranium and radium concentrations precisely, as local variations occur beyond area averages.
How Uranium and Radium Enter Groundwater in Arapahoe County
Uranium and radium occur naturally in certain rock formations and soils. In the Arapahoe County aquifer 211FXHL, geological materials release trace amounts of these elements into the groundwater through natural weathering processes. Human activities do not appear to significantly influence these concentrations in this region. Once in the groundwater, uranium and radium dissolve and travel with the water, eventually reaching residential wells. Understanding this natural origin helps clarify why concentrations remain stable over time and why treatment focuses on removal rather than source control.
Sample Size, Wells, and Interpretation Limits
The summary concentrations presented come from thirty samples collected from only two wells within the aquifer, sampled at moderate depths of 60 to 75 feet. Although this provides a solid indication of regional groundwater quality, it does not substitute for testing an individual well due to possible variation in local geology, well depth, and water flow. The sample size is moderate but cannot capture all temporal or spatial variability. Therefore, while these figures guide expectations, they are not definitive for any specific household water supply.
In conclusion, Arapahoe County's aquifer 211FXHL generally shows low typical uranium levels based on government monitoring. Households with failed treatment equipment facing uranium and radium concerns should obtain direct testing of their water to confirm concentrations. Should treatment be warranted, the Fleck Uranium & Radium System ships ready to configure and is designed to reduce these elements effectively, supporting improved household water quality.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2025-09-17. 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 Uranium in the 211FXHL aquifer (Arapahoe County): 30 results from 2 wells, median 0.1255 ug/L, range 0.107-0.168 ug/L; none above any federal threshold