What does the median and range of iron in Carlton County's aquifer mean for my home?
The U.S. Geological Survey collected samples from six wells between 35 and 148 feet deep in Carlton County’s 112TILL aquifer in May 2016. These six iron measurements showed a median value of 301.5 micrograms per liter, with individual results ranging from 13.7 to 609.0 micrograms per liter. This data reflects the typical range of iron concentrations found across those sampled wells in this aquifer but does not describe your specific water supply.
As a homeowner, the median suggests the middle value reported—half the samples had iron results above this number and half below—while the range indicates the lowest and highest detected levels during sampling. Your well's iron could be anywhere within or outside this range. Only a direct test of your water can determine your actual iron level.
How should I compare Carlton County’s iron data with nearby counties without misinterpreting it?
When looking at iron data from neighboring areas, such as adjacent counties or different aquifers, it’s important to remember that geological differences often cause natural variation in iron levels. Higher or lower median values nearby don’t automatically mean your water matches those findings. The reported iron in Carlton County represents six distinct wells in one aquifer, so differences with other areas reflect variations in source geology and sampling scope rather than any change in your water.
Use regional data as an indicator of typical conditions but rely on your own water testing for precise information.
What do “detected,” “median,” and “range” mean in this USGS iron sampling context?
In this record, “detected” means iron was measurable in every sample collected. None were below the reporting limit, which means the instrument recorded at least some iron in all six wells. The “median” is the middle number when all six results are ordered from lowest to highest. The “range” shows the span from the smallest to the largest amount found.
These terms describe the dataset gathered in the area but don’t represent regulatory thresholds or safety classifications. Detection alone is not a violation nor a health risk statement.
How can I distinguish iron and rust in water from similar appearing problems?
Iron and rust in water often appear as reddish-brown stains on fixtures, laundry, and dishes or cause discoloration and metallic taste. However, other issues can sometimes cause similar symptoms—for example, manganese can leave dark stains, and sediment can discolor water without chemical causes.
Iron differs in chemical behavior and treatment needs from these other concerns. Proper identification usually requires water testing to confirm iron concentration and speciation.
What does the measured iron range mean compared to federal standards?
Federal standards do not establish health-based limits for iron in drinking water because iron is not considered a direct health hazard at levels typically found in groundwater. Instead, aesthetic secondary standards guide concerns about taste, staining, and corrosion. Cathy’s samples from Carlton County’s aquifer report iron concentrations below any federal thresholds, meaning no exceedance or violation occurred in this data set.
High iron can cause nuisance problems in the home but does not imply unsafe water according to these standards.
What information should I write down before seeking treatment advice for iron and rust?
- Results from a certified laboratory iron test of your own water supply showing iron concentration
- Date and location of sampling
- Observations about staining, water color, taste, or any equipment issues
- Details about your water source depth and type if known
Gathering this information will help clarify your situation and guide appropriate treatment options.
What should I not assume from this area data about my water?
Area iron data offer insight into typical groundwater conditions but do not define your specific well water quality. You should not conclude that your water contains the median or any particular measurement from the report without testing. Detection of iron in regional samples is common and not a violation or safety concern by itself. Also, iron’s presence does not indicate health risk but relates primarily to household nuisance effects.
For households experiencing iron and rust problems, the C-Series Orange Iron & Rust Stains Filter ships ready to configure and is designed to address iron-related staining and discoloration effectively when your water tests confirm iron presence. Remember that treatment choice depends on knowing your water's actual composition.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2016-05-13. 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 Iron in the 112TILL aquifer (Carlton County): 6 results from 6 wells, median 301.5 ug/L, range 13.7-609.0 ug/L; none above any federal threshold