A typical laboratory report for iron in water lists concentration as micrograms per liter (ug/L). In San Juan County's aquifer, recent U.S. Geological Survey data collected from September 2024 through September 2025 show iron results for eight wells ranging from 230 to 260,000 ug/L, with a median of 1,400 ug/L. These measurements come from wells 37 to 101 feet deep. Importantly, none of these samples exceeded federal safety thresholds, indicating no health-based violations were found in this regional data set. This report reflects iron presence but does not specify individual well conditions, which require separate testing.
What Details Should You Record Before Seeking Treatment Advice?
Before considering water treatment options, document your individual well's reported iron concentration and hardness level from a certified laboratory test. Note the test date, sampling depth, and units of measure. Confirm if the report references secondary standards for aesthetics or corrosion, as these differ from health-based limits. Keep track of water usage and household size since treatment capacity often relates to daily consumption.
Is Iron Concentration Consistent Across Seasons or Years?
The U.S. Geological Survey data from San Juan County show variability by sample date, with results collected over a full year exhibiting a wide range—from 230 to 260,000 ug/L. Seventeen out of twenty-two samples detected iron above the reporting limit, indicating some wells experience more iron presence than others. Such variation is typical for groundwater, influenced by geological and hydrological factors. Without regular testing, homeowners cannot assume iron levels remain stable, underscoring the importance of periodic sampling.
How Does Iron Enter Groundwater in San Juan County?
Iron in the San Juan County aquifer originates naturally from iron-bearing minerals dissolved in subsurface rocks and sediments. This source type is common in many parts of the western U.S. The depth of wells sampled (37 to 101 feet) suggests iron is mobile at typical residential well depths. Iron can cause discoloration, staining, and affect taste or plumbing if concentrations are elevated, but presence alone is not indicative of safety concerns as no federal limits were exceeded in the regional samples.
Interpreting the Median and Range: What Does This Mean for Your Home?
The median iron concentration of 1,400 ug/L provides a midpoint estimate for the area but is not representative of any specific well. The broad range indicates some wells have minimal iron, while others have much higher levels. For a household weighing treatment options, understanding this range highlights that individual water conditions may differ significantly from regional data. Certified testing of your well water is essential to determine the exact iron and hardness levels you face.
How Water Quality Changes at the Tap After Treatment
The Autotrol Iron + Hard Water (Well) System, with a grain capacity of 32,000, is designed to reduce iron and hardness in home water supplies. When configured with your water profile, it helps minimize staining, improves taste, and protects plumbing fixtures by managing these constituents effectively. This system ships ready to configure for residential well water, providing an engineered approach tailored to manage both iron and hardness together.
In summary, regional iron data from San Juan County's aquifer show a wide range of iron concentrations but no health-based exceedances. Homeowners should rely on their own well testing to assess water quality. The Autotrol Iron + Hard Water (Well) System offers a documented solution to address the specific challenge of iron and hardness in well water.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2025-09-19. 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 aquifer (San Juan County): 22 results from 8 wells, median 1400.0 ug/L, range 230.0-260000.0 ug/L; none above any federal threshold
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