Heavy Metals in Graham County Groundwater: Understanding Selenium Levels and Treatment Options

Government groundwater sampling in Graham County's aquifer N100BSNRGB recorded selenium levels measured in 29 samples taken from seven different wells between late 2010 and late 2014. These results showed selenium detected in 18 samples at concentrations ranging from 0.107 to 3.0 micrograms per liter (ug/L), with a median value of 1.475 ug/L. Importantly, none of these measurements exceeded federal guidelines for selenium in drinking water.

If heavy metals like selenium are not addressed over years

Selenium is a naturally occurring element that can enter groundwater through mineral dissolution and human activities. Long-term exposure to elevated selenium concentrations may lead to subtle health effects, although the exact impact depends on the concentration and individual susceptibilities. While no federal exceedances were reported in the sampled wells, untreated selenium at higher levels can pose concerns for water taste, staining, or bioaccumulation risks.

If you need treatment capacity matched to your household demand

When considering treatment approaches for selenium, it's important to assess daily water use volume and peak demand. Household water consumption patterns will determine the size and capacity required for effective removal technology. Choosing a system capable of handling your household's flow rate ensures consistent treatment without compromising water availability during higher usage periods.

If your well depth or water source type differs within Graham County

The groundwater samples in Graham County came from wells with depths ranging from 83 to 1,200 feet. Deeper wells may have different selenium levels than shallower ones based on local geology and water flow paths. Therefore, your own well’s depth and water source type will influence selenium concentrations, and expecting the same levels found in area aquifers may not be accurate without testing your specific water.

If sample size and well count affect confidence in regional water data

The selenium data reflect 29 samples from seven wells in Graham County’s aquifer, collected over four years. While this provides useful regional insight, the relatively small number of wells and samples means variability may exist in unmeasured locations. This highlights the importance of individual water testing to confirm actual household selenium levels rather than relying solely on area data.

If selenium levels vary seasonally or over multiple years

The government’s selenium samples span over four years, capturing some temporal variation. The range of detected concentrations (0.107 to 3.0 ug/L) illustrates variability but shows no trend of levels exceeding federal guidelines within that period. Seasonal changes or longer-term shifts could impact selenium concentrations, so periodic testing can provide updated information relevant to your specific water supply.

In summary, Graham County’s aquifer data indicate selenium is present at varying but federally compliant levels. To make an informed decision about managing heavy metals, it’s important to test your household water specifically and match treatment capacity to your daily usage. The Fleck Heavy Metals Filter ships ready to configure and offers a documented approach for residential selenium reduction based on those needs.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2014-11-20. 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 N100BSNRGB aquifer (Graham County): 29 results from 7 wells, median 1.475 ug/L, range 0.107-3.0 ug/L; none above any federal threshold