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What do the measured iron concentrations in Iron County groundwater mean compared to federal standards?

The U.S. Geological Survey sampled 44 wells in Iron County's 100VLFL aquifer between 2010 and 2021. Iron was detected in 31 of 116 results, with a median concentration of 6.7 micrograms per liter (ug/L) and a range from 3.7 to 19.9 ug/L. Importantly, none of these results exceeded any federal limits for iron in drinking water.

This indicates that while iron is present at measurable levels, it does not surpass regulatory thresholds designed to protect health. However, iron even below these thresholds can contribute to rust staining and water discoloration that some households seek to address.

How do sample depth and well depth influence expected iron levels in Iron County?

The wells sampled ranged in depth from 148 to 910 feet, covering a variety of groundwater sources within the aquifer. Iron concentration can vary with depth because mineral content often changes as water moves through different layers underground. Generally, deeper wells might draw water with different iron levels than shallower ones due to distinct geological formations and oxidation conditions.

Because of this variation in sample depth and local geology, a household’s actual iron level may differ from regional medians. Testing your own water is necessary to confirm specific concentrations.

How should Iron County’s iron data be compared with neighboring counties?

When comparing Iron County's iron data to neighboring regions, it's essential to consider similar sample conditions such as aquifer type, well depth ranges, and sampling periods. Differences in geology and water sources can lead to variations in iron levels. Avoid assuming that data from one county directly applies to another without these contextual factors.

Regional data helps set expectations but should not replace site-specific water analysis.

How would a homeowner interpret the median and range of iron results from this record?

A median iron level of 6.7 ug/L means half of the detected samples are above this amount and half below. The range from 3.7 to 19.9 ug/L shows some fluctuation among wells. For a homeowner, this suggests iron is often present at low to moderate levels that could cause aesthetic issues like rust-colored staining but are well below health-based limits.

Recognizing this range helps in selecting an appropriate treatment approach that targets iron removal for appearance and maintenance concerns, rather than addressing a health violation.

How does iron enter groundwater or the distribution system in Iron County?

Iron naturally occurs in groundwater as water moves through mineral-rich soils and rocks in the aquifer. It can dissolve into the water in ferrous (soluble) form under low-oxygen conditions and later oxidize to ferric (solid) form when exposed to air, forming rust-colored particles. This process can cause rust stains in plumbing, fixtures, and laundry.

Iron presence depends on local geology and water chemistry, making it a common but manageable issue in Iron County’s groundwater.

What test should a homeowner order to settle their water’s iron situation?

To determine the household’s specific iron concentration and its form, order a comprehensive water test from a certified laboratory that measures both dissolved and total iron. This test will clarify whether iron levels align with regional findings and whether the water contains soluble or particulate iron, which affects treatment choices.

Once test results are available, appropriate treatment can be selected. The Autotrol Orange Iron & Rust Stains Filter ships ready to configure and is designed to reduce iron and rust staining effectively in residential water, addressing the typical iron levels found across Iron County.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2021-06-22. 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 100VLFL aquifer (Iron County): 116 results from 44 wells, median 6.7 ug/L, range 3.7-19.9 ug/L; none above any federal threshold