Local Water Source Overview
The Oswego public water system in Kendall County relies on groundwater drawn from local aquifers. This groundwater is treated and distributed to about 38,169 residents through over 12,800 connections. While community equipment works to maintain water quality, 1,4-dioxane—a synthetic cyclic ether used mainly as a solvent stabilizer—can appear at low levels that are sometimes challenging for existing home water equipment to manage fully.
How Environmental Factors Contribute to Oswego’s 1,4-Dioxane Records
Landfill Leachate Influence
Landfill leachate can carry trace quantities of 1,4-dioxane into shallow groundwater, leading to occasional detections in public water sources like Oswego’s.
Degreasing Site Effects
Sites where solvents containing 1,4-dioxane were historically used for degreasing industrial equipment may marginally influence nearby groundwater quality.
Consumer Product Residue
Consumer products that include 1,4-dioxane as a contaminant byproduct can contribute small amounts to groundwater through wastewater discharge.
Understanding the Precision in Low-Level Detection Reporting
Reporting to Three Decimal Places
Detected concentrations are reported as low as 0.07 micrograms per liter (µg/L), or 0.07 parts per billion (ppb), to convey measurement precision. This extensive decimal reporting does not imply exceeding health limits but provides detailed insight into minimal presence in water.
Significance of Reporting Limit
The reporting level indicates the smallest concentration reliably measured, not a safety threshold or violation.
Interpreting Median and Range from Water Sampling Data
Median Value Explanation
The median concentration for 1,4-dioxane in Oswego’s water system during the 2013-2015 monitoring period was below the reporting level, showing that at least half of samples had no measurable 1,4-dioxane detected.
Range of Concentrations
The range includes all measured values; in this case, no samples were found above 0.07 µg/L, indicating consistent low-level or non-detectable presence.
Water Source and Sampling Depth Considerations
Impact of Sample Depth
Samples taken from different depths can reveal varied concentrations; deeper groundwater often shows fewer traces of surface-derived contaminants like 1,4-dioxane.
Well vs. Public System Source
Public water systems like Oswego’s generally mix water from multiple wells, averaging out variations that might appear in an individual private well.
Distinguishing Health-Based Limits from Aesthetic Secondary Standards
Health-Based Concentration Benchmarks
The EPA provides a cancer risk reference concentration for 1,4-dioxane at 0.35 µg/L, but no federal maximum contaminant level (MCL) currently exists for this compound.
Aesthetic Thresholds Do Not Equal Safety Limits
Some jurisdictions use secondary standards to govern taste or staining, but these are independent from health-based advisories and do not imply a health risk if exceeded.
Clarifying Sampling Terms in Oswego's Water Records
Meaning of 'Detected'
'Detected' means 1,4-dioxane was measured above the reporting level, not that it is unsafe or legally non-compliant.
Understanding 'Median' and 'Range'
'Median' is the middle value of all samples, while 'range' encompasses the lowest and highest detected levels within the sampling period.
Recommended Testing and Next Steps
To assess 1,4-dioxane levels in your household water specifically, order a comprehensive water test from a certified laboratory capable of detecting this cyclic ether at parts-per-billion levels. Your results will clarify whether your current equipment adequately manages this constituent or if additional treatment should be considered.
If ongoing management is needed, equipment such as the Pentair 1,4-Dioxane Filter ships ready to configure and is designed to address levels typical of municipal groundwater sources like Oswego’s.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-01-14. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Oswego (IL0930150), IL: 16 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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