What do 'detected', 'median', and 'range' mean in the sampling record on this page?
Government data from the U.S. Geological Survey shows selenium was detected in 17 out of 21 groundwater samples taken from Sherburne County's aquifer 112PLSC between 2011 and 2018. The median value of these measurements was 0.19 micrograms per liter (ug/L), representing the middle concentration point when all samples are ordered. The range, from 0.06 to 0.53 ug/L, shows the lowest and highest selenium concentrations measured in this set of samples. These figures reflect area-wide measurements, not those from any individual household well.
Which fixtures, appliances, or processes are affected first and why?
Heavy metals like selenium, when present, can most noticeably affect household fixtures such as faucets and water-using appliances that experience mineral buildup or staining. These effects emerge because metals can accumulate on surfaces or interact with water chemistry. Knowing which parts of your home water system show early signs of issues can help focus testing and treatment efforts.
How many samples and wells stand behind the figures, and what does a small sample mean?
The selenium data come from 21 individual samples taken from 16 separate wells ranging from 8 to 57 feet deep. While this provides useful insight into regional groundwater quality, the relatively small number of samples means these measurements offer a general picture—not a precise prediction—for every well or household in Sherburne County.
What does a certified laboratory test for this constituent report and how should it be read?
A certified laboratory report for selenium in water will show the concentration in micrograms per liter or parts per billion. It may also indicate whether the level was detected or below the reporting limit. Understanding that detection means the element was measured, but not necessarily at a harmful level, is crucial. Only direct testing of your household water can confirm your specific selenium levels.
How do you judge treatment capacity against the household's daily demand?
Treatment capacity should match or exceed the amount of water your household uses daily to ensure effective removal of heavy metals. Factors like household size and daily water use patterns influence this calculation. Ensuring the treatment system fits these demands helps maintain water quality consistently.
What does the measured range mean against the relevant federal standard, and what does it not mean?
All selenium measurements from these samples are below federal threshold levels, indicating no regulatory concern for regional groundwater quality in Sherburne County based on this data. However, this does not guarantee that every household’s water supply will have similarly low levels. Detection alone does not denote a violation or health risk. For homeowners uncertain about their water quality, testing is the only way to clarify conditions.
When a test confirms selenium or other heavy metals in your household water, a C-Series Heavy Metals Filter can help reduce these constituents. This system ships ready to configure for in-home use, offering a documented solution tailored to household heavy metals concerns.
What test should I order to settle the question?
The single most effective step is to order a certified laboratory test for selenium concentration specific to your household water. If the test results show elevated levels of selenium or other heavy metals, you will have a clear basis to consider treatment options. This approach ensures decisions are based on your water’s actual condition, not area-wide data alone.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2018-07-31. 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 112PLSC aquifer (Sherburne County): 21 results from 16 wells, median 0.19 ug/L, range 0.06-0.53 ug/L; none above any federal threshold