If Your Lab Report Lists 1,4-Dioxane Concentration Near or Below 0.07 µg/L
A laboratory test report for 1,4-dioxane in water typically shows concentrations measured in micrograms per liter (µg/L), or parts per billion (ppb). In Canyon County, groundwater serving the City of Caldwell has undergone federal monitoring, which found no concentrations above 0.07 µg/L in 26 samples taken between 2014 and 2015. This figure is a reporting level rather than a regulatory standard. No maximum contaminant level (MCL) currently exists for dioxane under federal law, though the EPA provides a cancer risk reference concentration of 0.35 µg/L for informational purposes. Understanding these measurements helps frame what a detection means—and does not mean—for your household water quality needs.
If You Want to Know Why 1,4-Dioxane Travels Ahead of Other Solvent Contaminants
The cyclic ether 1,4-dioxane behaves differently in groundwater compared to many other solvents it often accompanies. Unlike heavier solvent compounds that tend to settle or degrade near their source, dioxane is highly soluble and moves more rapidly down-gradient from sites like landfills and degreasing facilities. This mobility allows it to penetrate areas beyond the original solvent plume. For households relying on groundwater wells in Canyon County, understanding that dioxane can be present even when other contaminants are absent or at low levels can explain why existing treatment equipment may seem insufficient in managing this specific chemical.
If Your Current Carbon or Boiling Methods Leave Residual 1,4-Dioxane
Conventional treatment methods, such as activated carbon filtration and boiling, have limited effectiveness against 1,4-dioxane. The solvent stabilizer resists adsorption on carbon media and has a high boiling point relative to water, making removal by boiling ineffective. Documented technologies that work to address this challenge involve specialized filtration and catalytic oxidation techniques that transform or capture the cyclic ether molecules more thoroughly. For residential applications in Canyon County, systems designed specifically for 1,4-dioxane can complement or augment existing equipment that otherwise cannot keep up with this contaminant’s unique properties.
If You Wonder How a UCMR3 Detection Relates to State Notification Levels for Dioxane
The Unregulated Contaminant Monitoring Rule 3 (UCMR3) conducted by the EPA provides occurrence data without establishing enforceable standards. Detection above the reporting level in this federal survey does not equate to a violation or unsafe water. Some states set their own notification levels or guidelines for 1,4-dioxane, which can differ from federal data thresholds. In Canyon County, the EPA’s system record for the City of Caldwell shows no health-based violations and no detection above the federal reporting limit. Understanding this difference is important in evaluating the significance of any household water test results and determining when treatment measures might be considered.
If You Seek to Understand Common Sources Contributing to 1,4-Dioxane in Groundwater
The presence of 1,4-dioxane in groundwater often stems from industrial and consumer-related activities. Landfill leachate can carry dissolved cyclic ethers released from disposed products. Sites used for degreasing operations historically employed solvents stabilized with dioxane to prevent degradation. Additionally, household products and cleaners may contain trace amounts that enter septic systems and groundwater over time. Collectively, these diverse sources contribute to the federal monitoring record in Canyon County, helping explain detections even when treatment systems remove other contaminants effectively.
If Your Household Experiences Symptoms That May or May Not Indicate 1,4-Dioxane
Unlike contaminants that cause taste or odor issues, 1,4-dioxane is generally colorless and odorless at low levels. Homeowners may not notice direct sensory effects. While the general public should be aware of potential health risks associated with chronic exposure at higher concentrations, symptoms or water quality issues observed in a home are rarely specific to the cyclic ether alone. Testing is the only way to confirm presence and concentration. If existing equipment seems not to keep pace with removing 1,4-dioxane, dedicated filtration targeting this contaminant can be an appropriate next step.
If You Need to Distinguish Between Public System Records and Private Well Testing
The EPA’s monitoring data reflects sampling from the public water system supplying approximately 74,000 people in Canyon County via 25,000 connections. This data documents system-wide occurrence, not individual households. Private wells may have different water quality, and only specific testing of your own water can determine individual concentrations of 1,4-dioxane. Homeowners relying on private sources should consider laboratory analysis if concerned. For those on the City of Caldwell public system, the documented absence of detections above reporting levels provides context for evaluating treatment necessities.
Closing Summary
The City of Caldwell’s public water system record for Canyon County shows federal monitoring detected no 1,4-dioxane above 0.07 micrograms per liter (parts per billion) in groundwater sources between 2014 and 2015. While this cyclic ether solvent stabilizer moves differently from other solvents and resists traditional treatment methods like carbon filtration or boiling, specialized equipment designed for 1,4-dioxane can provide an effective residential solution when equipment struggles to keep up. This page draws solely on government data from the EPA’s public water system record for Canyon County. For more information, consult the original EPA resource on unregulated contaminant monitoring.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-05-28. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for City of Caldwell (ID3140013), ID: 26 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level