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How Seasonal and Multi-Year Variation Shows in Selenium Sampling from Wasatch County Aquifer 100VLFL

Groundwater drawn from aquifer 100VLFL in Wasatch County has been sampled regularly over a period spanning from 2013 to 2025. This multi-year data set, gathered by USGS at four wells ranging from 75 to 217 feet deep, reveals selenium concentrations detected in most samples but consistently below any federal health threshold. The recorded values range from 0.05 to 1.1 micrograms per liter, with a median near 0.2 micrograms per liter. Over this time frame, results do not show any increasing or problematic spikes that would suggest acute contamination events. Instead, natural seasonal and long-term fluctuations within this range appear typical for the aquifer based on these measurements.

How Well Depth Influences What You Might Expect in Your Household Water

The wells sampled in this area varied substantially in depth, from shallow 75 feet to deeper reaches exceeding 200 feet. This range matters because different depths can encounter varying geologic strata and thus differing selenium levels. Generally, deeper wells might tap into water with properties distinct from shallow wells, but sampling in Wasatch County's aquifer 100VLFL has shown that selenium remains present yet low across this depth spectrum. Homeowners should recognize that their own well depth may influence water composition, but local regional data suggest consistent selenium presence within safe bounds down to at least 200 feet.

What You Should Record Before Seeking Treatment Guidance for Heavy Metals

Before evaluating treatment options, it is important to have precise information about your own water supply. This includes recent laboratory test results specific to your household water, detailing concentrations of targeted heavy metals such as selenium. Additionally, knowing the depth and type of your well can help contextualize these results. Without your own water’s test data, decisions rely solely on regional averages, which may not reflect your specific conditions. This is a critical step before considering any filtration system designed to address heavy metals.

Differences Between Regional Public Water System Records and Private Well Testing

Government sampling data for aquifer 100VLFL in Wasatch County represent regional groundwater quality from multiple monitoring wells. These data provide an overview of typical selenium concentrations but do not capture individual private well conditions. Publicly reported results focus on compliance and large-scale trends, while private well testing directly measures your household’s water quality. Understanding this distinction helps separate general regional water characteristics from the actual composition of your own water supply, which can vary due to local geology and well construction.

Household Symptoms That May and May Not Indicate Heavy Metal Concerns

Water with elevated heavy metals can sometimes cause distinct symptoms such as unusual taste, staining on fixtures or laundry, or visible discoloration. However, the selenium concentrations detected across Wasatch County’s aquifer 100VLFL are below federal thresholds that would typically cause such effects. If your household experiences symptoms commonly linked to heavy metals, testing for selenium and other elements is advisable to confirm the cause. Absence of symptoms does not guarantee absence of contaminants, nor do symptoms definitively prove contamination without laboratory verification.

Understanding 'Detected,' 'Median,' and 'Range' in the Sampling Record

The term ‘detected’ means that instruments measured selenium in the water samples, not that the levels exceed safety standards. In this data set, selenium was detected in 47 of 50 samples, with three samples falling below the detection limit. The ‘median’ of 0.2 micrograms per liter represents the middle value in the measurements, indicating a typical selenium concentration in this area’s groundwater. The ‘range’ from 0.05 to 1.1 micrograms per liter shows the lowest and highest detected values, demonstrating variability but always under federal limits for selenium.

While these results provide a regional snapshot, they do not indicate any violation or unsafe condition for any specific well or household water source.

What You Should Not Conclude from Area Selenium Data Alone

While the regional data from Wasatch County’s aquifer 100VLFL show selenium presence below federal health thresholds, this does not guarantee your private well water shares the same levels. Variations in well depth, local geologic conditions, and well construction can significantly influence your water quality. Therefore, relying on regional measurements alone to assess your household’s heavy metals is insufficient. Accurate testing of your own water supply is the only way to determine whether treatment is needed.

For households concerned about heavy metals, the Fleck Heavy Metals Filter ships ready to configure and offers a proven technical method for reducing selenium and other metals when present above desirable levels. It is designed to work effectively in residential settings like those drawing from aquifer 100VLFL, but informed decisions start with individualized water analysis.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2025-09-03. 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 Selenium in the 100VLFL aquifer (Wasatch County): 50 results from 4 wells, median 0.2 ug/L, range 0.05-1.1 ug/L; none above any federal threshold