1. What 'Detected', 'Median', and 'Range' Mean in the Grand County Sampling Data
The U.S. Geological Survey has sampled groundwater from wells in Grand County, specifically aquifer 111VLFL, over the period from May 17, 2010, to May 15, 2025. Their data shows iron was detected in 10 of 11 samples from 5 different wells, with a median concentration of 6031 micrograms per liter (ug/L) and a range spanning from 4.7 to 58700 ug/L. ‘Detected’ indicates that instruments measured the presence of iron, while 'median' represents the middle value in the dataset, and 'range' captures the minimum and maximum observed concentrations. These wells were relatively shallow, between 16 and 28 feet deep.
2. Steps to Rule Out Issues in Your Household Water, Starting with Simple Checks
Knowing the local groundwater iron levels helps, but your home's water may differ. Begin by examining your water's appearance and behavior. Iron can cause reddish or brown staining on fixtures and laundry. Hardness, related to calcium and magnesium but not included in this dataset, often leads to scale buildup and soap scum. If these signs appear, a laboratory water test is recommended to measure your specific iron and hardness levels accurately. Testing confirms your water’s composition and guides treatment decisions.
3. What the Measured Iron Range Means in Relation to Federal Guidelines and What It Does Not Imply
None of the iron measurements from the sampled wells exceeded federal action levels, which indicates that detected iron concentrations in this aquifer have not been recorded above health-based regulatory thresholds. It is important to note that iron itself is not a regulated contaminant at these levels and is often more of an aesthetic or operational concern, affecting taste, staining, and plumbing. Therefore, the detection of iron, even at higher levels in the range, does not signal a health hazard but may justify treatment to improve water quality.
4. Understanding Seasonal and Multi-Year Variation in Iron Levels in Grand County Water
The recorded samples span over 15 years, showing that iron concentrations can vary widely at different times and from well to well. Such variation likely reflects natural fluctuations in the aquifer influenced by factors like water table levels, seasonal changes, and well depth. This variability means that a single test in your home may not capture fluctuations, so periodic testing is advisable if iron or hardness problems persist or worsen over time.
5. Considerations for Large Households, Second Homes, and Seasonal Residences
Water usage patterns affect treatment needs. Larger households or those with higher water demand require treatment equipment that can handle greater volumes without frequent regeneration. Seasonal or secondary residences may experience different water quality due to system inactivity or changes in source water during off periods. The Autotrol Iron + Hard Water (Well) System offers a grain capacity of 32,000, providing substantial treatment capability suitable for varied household sizes and uses. It ships ready to configure for your plumbing setup, addressing both iron and hardness concerns effectively.
In summary, the U.S. Geological Survey data for Grand County’s aquifer 111VLFL covers iron levels in wells sampled between 2010 and 2025, referencing 5 local wells at shallow depths. It highlights typical iron presence without indicating health-based violations but points to possible aesthetic and maintenance issues that treatment can resolve. For more details, the government source is available at https://waterdata.usgs.gov/monitoring-location/395706105485000/.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2025-05-15. 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 111VLFL aquifer (Grand County): 11 results from 5 wells, median 6031.0 ug/L, range 4.7-58700.0 ug/L; none above any federal threshold