How Records from Public Aquifers Differ from Private Well Tests
Samples Represent Multiple Wells, Not A Single Home
Government data on iron in Pawnee County comes from five separate wells drilled between 67 and 185 feet deep. These measurements describe the area's aquifer, rather than any one household's water.
Testing in Public Studies Uses Controlled Methods
The US Geological Survey applies standardized sampling to understand regional groundwater quality. Private wells can vary substantially, so individual testing is needed to know what water a specific home receives.
What to Note Before Seeking Water Treatment Advice
Record Iron Levels Vary between 12.4 and 143.0 Micrograms per Liter
In the Pawnee County aquifer, iron was detected in three out of five samples with a median measurement of 22.9 micrograms per liter. The other two samples were below the method's reporting limit.
No Federal Health Thresholds Were Exceeded in These Tests
The iron concentrations found were all below any federal health-based limits. Detected iron does not itself indicate a safety violation or health risk.
Homeowners Must Test Their Own Water to Confirm Local Conditions
Because regional sampling cannot detail private well water quality, household water testing is necessary to determine if iron bacteria are present and at what level.
How Many Wells and Samples Support This Regional Data
Five Wells Sampled Over Several Weeks in Spring 2018
The USGS collected five water samples from separate wells within the Pawnee County aquifer 322VNSS during March to May 2018. This limited sample set provides a general picture but does not capture all local variations.
Limited Sample Size Means Wider Variability May Exist
A small number of measurements means some homes may experience different iron levels in their water. More comprehensive testing is required to understand specific conditions.
Why Aesthetic Standards Differ from Health-Based Limits
Iron Influences Taste, Color, and Staining More than Safety
Iron in water mainly affects aesthetics such as reddish staining on fixtures and a metallic taste. These effects are governed by secondary standards focused on appearance and usability, not health risk.
Detected Iron Below Federal Limits Indicates No Health Concern
All iron concentrations measured by the USGS fell below federal health-based thresholds. This means detected iron levels are typical for groundwater and not indicators of unsafe drinking water.
How Iron Enters Groundwater in Pawnee County
Iron Naturally Occurs in the Aquifer Geology
Iron in Pawnee County's aquifer comes from natural mineral deposits in underground rock formations. It dissolves into water over time, contributing to regional groundwater iron levels.
Iron Bacteria Can Develop When Iron Combines with Oxygen
When iron-rich water contacts air, iron bacteria may form slime deposits and affect water quality in plumbing. These bacteria are often noticed by staining and slime rather than taste alone.
In summary, USGS sampling of five wells in Pawnee County's aquifer 322VNSS found iron detected in three samples at concentrations below federal health limits. These results describe the area's groundwater but cannot substitute for private well testing to confirm household water quality. For homes experiencing issues potentially caused by iron bacteria, the Pentair Iron Bacteria & Slime Filter ships ready to configure and can help reduce slime and buildup caused by iron bacteria contamination. The government measurements referenced here are publicly available through the USGS water data portal.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2018-05-11. 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 322VNSS aquifer (Pawnee County): 5 results from 5 wells, median 22.9 ug/L, range 12.4-143.0 ug/L; none above any federal threshold
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