Government sampling by the U.S. Geological Survey (USGS) in Orange County, Florida, reports iron concentrations detected in local wells drawing from aquifer 120FLRD. Among 115 samples taken from 39 wells ranging 280 to 1500 feet deep, iron was measured in 78 samples with a median of 15.9 micrograms per liter (ug/L), spanning from 5.1 to 944.0 ug/L. No federal health thresholds were exceeded in these samples, reflecting typical groundwater conditions but not assessing any individual household well.
Which Household Fixtures and Appliances Are Affected First and Why
Iron and hardness in water primarily impact fixtures that involve frequent water contact, such as faucets, showerheads, and internal parts of water heaters. Iron contributes to staining and can accumulate in appliances, while hardness—due to dissolved minerals like calcium and magnesium—can cause scale buildup inside pipes and heating elements. These effects reduce appliance efficiency and can lead to costly repairs over time.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
Consider the median iron concentration of 15.9 ug/L reported by USGS for wells in Orange County's aquifer 120FLRD. This indicates that half of the sampled wells had iron levels at or below this value. The range, extending to 944.0 ug/L, suggests some localized higher iron presence but not necessarily in all wells or at household taps. A homeowner should understand this as variability in groundwater iron concentrations across the area rather than a direct measure of their own water.
What a Certified Laboratory Test for This Constituent Reports and How to Read It
Testing household water for iron typically involves collecting a sample sent to a certified laboratory, which quantifies total iron concentration often reported in micrograms per liter (ug/L) or milligrams per liter (mg/L). A lab report may also distinguish between dissolved and particulate iron. Understanding these categories helps determine if iron is likely to cause staining or sediment issues. The report clarifies whether iron levels in your water are consistent with or differ from regional measurements.
How the Constituent Enters Groundwater or the Distribution System in This Region
Iron commonly originates from natural mineral deposits in the aquifer rock formations beneath Orange County, released into groundwater through natural geochemical processes. As water moves through the aquifer, it dissolves iron-bearing minerals. The concentration detected can vary due to depth, water chemistry, and well construction. When groundwater with iron is pumped into household plumbing, it can interact with oxygen, causing reddish-brown staining and sediment deposition.
How Sample Depth, Well Depth or Source Type Changes What a Reader Should Expect
Sampling depths for the USGS data ranged from 280 to 1500 feet, reflecting both shallow and deep wells. Deeper wells often yield water with different mineral content than shallower sources. For a homeowner, this means iron and hardness levels may differ depending on the depth of their well or source. Public water systems may blend water from various sources, so their records reflect an aggregate rather than a specific point.
How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The USGS analyzed 115 samples from 39 wells, providing a robust dataset for estimating iron concentrations in the Orange County 120FLRD aquifer system. This breadth enables understanding regional trends and variability. However, individual well conditions can differ substantially. A small number of samples from a single well would not provide a reliable picture of area water quality or establish typical iron or hardness levels.
Given these considerations, the single decisive step is to have a certified laboratory test performed on a water sample taken directly from your household tap or well. This test will confirm iron and hardness levels unique to your water supply and clarify what treatment approach is best. For managing these concerns effectively, the Autotrol Iron + Hard Water (Well) System offers a solution designed for typical residential capacities up to 32,000 grains, addressing both iron and hardness simultaneously and shipping ready to configure for your needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2026-05-27. 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 120FLRD aquifer (Orange County): 115 results from 39 wells, median 15.9 ug/L, range 5.1-944.0 ug/L; none above any federal threshold
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