Local Aquifer and Water Flow to Residential Taps

The aquifer labeled 110QRNR under McLean County, Illinois, supplies groundwater to many private wells. Water moves through soil and rock layers before reaching well screens at various depths. The water quality reaching homes depends on characteristics of this aquifer and the screened intervals of individual wells.

Sample and Source Depth Variations to Consider

Sample Depths Range Widely in This Aquifer

Samples were collected from wells ranging 12 to 320 feet deep. Water quality can vary by depth, so homeowners with shallower or deeper wells should expect some differences from the area median results.

Source Type Affects Iron Presence

Groundwater from aquifers can carry dissolved minerals like iron and hardness-causing compounds in varying amounts depending on geology and water-rock interaction times.

Sample Size and Its Implications

Fifty Samples from Ten Wells Provide Regional Overview

The data represent 50 samples collected between 2010 and 2018 from 10 different wells in the aquifer. This sample size offers a broad but not exhaustive picture of area water quality.

Limited Wells Mean Some Variation Remains Uncaptured

With only ten wells, individual well water could differ significantly from these results due to local factors not covered in the sample set.

Differences Between Public Records and Private Well Testing

Area Sampling Provides General Trends, Not Specific Well Data

The U.S. Geological Survey results describe regional aquifer conditions but do not reflect a particular well’s water quality. Homeowners should conduct private testing for accurate results.

Private Testing Is Necessary for Treatment Decisions

Because of individual variations, only a certified laboratory test of the water drawn from the home’s tap or wellhead reveals actual iron or hardness levels present.

Aesthetic vs. Health-Based Standards for Iron

No Federal Health Violations Found in Area Samples

None of the samples exceeded any federal health-based iron thresholds. Detection of iron does not equate to a safety concern.

Ironic Effects Are Primarily Aesthetic or Functional

Iron in water can cause staining or metallic taste but is generally regulated by secondary standards aimed at aesthetics and plumbing maintenance rather than health.

Reading the Median and Range: A Worked Example

Median Iron Level Is 147.0 Micrograms per Liter

This median indicates that half of the samples showed iron concentrations above and half below 147.0 ug/L, a common representation of typical groundwater conditions in this aquifer.

Range Indicates Some Wells Have Significantly More Iron

The range extends from 3.9 to 2260.0 ug/L, showing some wells have much higher detected iron. This variation highlights the importance of individual testing before treatment decisions.

Detected but Not Reported Means Some Samples Had Very Low Iron

Eight samples were below reporting limits, indicating iron wasn’t measurable or was very low in those cases.

Summary of the Decision Path

McLean County’s aquifer sample data provide useful context for understanding potential well rust and hardness but cannot define a home's specific water quality. Accurate treatment decisions require direct water testing at the residence.

The C-Series Well Rust + Hardness System ships ready to configure and offers effective treatment for households confirming iron and hardness levels that warrant intervention.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2018-08-01. 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 110QRNR aquifer (McLean County): 50 results from 10 wells, median 147.0 ug/L, range 3.9-2260.0 ug/L; none above any federal threshold