Uranium-Radium in San Bernardino County: Understanding Regional Water Sampling Data
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Plumbing Material and Age Versus Source Water Composition
When considering uranium and radium in household water, it is important to separate the influence of plumbing materials and their age from the naturally occurring concentrations in the source water. Plumbing pipes and fixtures typically do not contribute to uranium or radium levels, which originate underground rather than from distribution systems or pipe corrosion. However, older plumbing can affect water quality through other minerals or metals unrelated to uranium or radium. This distinction helps focus testing and treatment efforts on the water source itself rather than the household plumbing system.
Impact of Sample Depth, Well Depth, and Source Type on Expected Uranium Levels
Government groundwater sampling in San Bernardino County, specifically the N100BSNRGB aquifer, includes wells ranging in depth from 24 to 1130 feet. Uranium was detected in 700 out of 737 samples collected from 320 wells. The median uranium concentration measured was 8.82 micrograms per liter, with values ranging widely from 0.051 to 1360 micrograms per liter. Deeper wells often encounter different geological formations and thus may show differing uranium levels compared to shallow wells. The source type—whether a domestic well or a deeper regional aquifer—also influences expected uranium presence, making it essential for homeowners to consider the depth and source characteristics of their specific water supply when evaluating potential uranium exposure.
Differences in Water Quality at the Tap After Using the Autotrol Uranium & Radium System
The Autotrol Uranium & Radium System is designed to reduce uranium and radium levels in household water supplies. When configured and operated properly, this system treats the source water, helping to lower concentrations of these naturally occurring elements. Treated water at the tap typically shows significantly reduced uranium and radium content, addressing concerns related to aesthetic issues such as discoloration or scaling and supporting peace of mind about water quality. This system offers a grain capacity of 32,000, which reflects its ability to treat a substantial volume of water before requiring material replenishment.
Understanding 'Detected', 'Median', and 'Range' in Regional Uranium Sampling
The government sampling data reports uranium as 'detected' in most wells sampled within the area, meaning the measuring instruments identified the element present at measurable concentrations. A 'median' value of 8.82 micrograms per liter indicates the middle concentration when all sample results are ordered from lowest to highest, providing a central tendency measure for the area’s groundwater. The 'range' reflects the lowest detected value (0.051 micrograms per liter) up to the highest measured (1360 micrograms per liter). Importantly, none of these samples exceeded any federal uranium threshold, indicating that although uranium is present, it was not measured above levels established for regulatory concern in this dataset.
Ruling Out Other Factors: From Simple Checks to Laboratory Tests
To clarify whether uranium or radium influences household water quality, begin with a review of plumbing and water source information, considering well depth and age. Next, check household signs such as unexpected staining or taste changes, though these are not definitive. Ultimately, a certified laboratory water test is necessary to quantify uranium or radium in your specific water supply. Laboratory testing is the only way to confirm actual concentrations and determine if treatment is warranted based on your household’s water characteristics.
Ordering a comprehensive water quality test specifically measuring uranium and radium levels will provide a clear understanding of your well’s condition. Commonly, a result showing concentrations below regulatory thresholds can offer reassurance. If higher levels are indicated, systems like the Autotrol Uranium & Radium System provide a documented approach to reducing these elements effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2026-05-13. 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 N100BSNRGB aquifer (San Bernardino County): 737 results from 320 wells, median 8.82 ug/L, range 0.051-1360.0 ug/L; none above any federal threshold