What Marion County’s Public Water Sampling Reveals About 1,4-Dioxane
The City of Keizer’s public water system in Marion County, Oregon, sources its supply from groundwater and serves nearly 39,000 people. Federal monitoring under the EPA’s Unregulated Contaminant Monitoring Rule 3 (UCMR3) between 2013 and 2015 tested for 1,4-dioxane, a cyclic ether and solvent stabilizer, across 30 samples. None of these samples showed 1,4-dioxane above the reporting level of 0.07 micrograms per liter (µg/L), or 0.07 parts per billion (ppb). Importantly, no EPA health-based violations related to this compound are on record for this system.
Landfill Leachate, Degreasing Sites, and Consumer Products as Contributors
1,4-Dioxane enters water supplies due to its use in various industrial and consumer contexts. It can leach from landfill sites where waste contains solvents and chemicals. Degreasing operations often use this cyclic ether to stabilize solvents, which has historically led to groundwater detections near such facilities. Additionally, some household and personal care products include 1,4-dioxane as a byproduct in their formulations. While Marion County’s measurements show no detections above reporting levels, these sources explain typical presence patterns in groundwater in similar regions.
Differences Between UCMR3 Detection and State Notification Levels
Federal UCMR3 monitoring records 1,4-dioxane occurrence data but does not establish enforceable regulations or maximum contaminant levels (MCLs) for this compound. Hence, a value reported above the detection or reporting level is not a violation or safety breach. Some states maintain separate notification levels, which are advisory thresholds. The Marion County data reviewed here reports no detections above federal limits, underscoring that this monitoring provides occurrence information rather than regulatory action triggers for residents.
Why Precision to Three Decimal Places Matters in Reporting
UCMR3’s reporting of 1,4-dioxane concentrations to three decimal places (e.g., 0.070 µg/L) reflects instrument sensitivity rather than an exact health risk cutoff. Such precision ensures subtle changes in low-level presence are tracked over time, assisting researchers and regulators in understanding environmental trends. For homeowners, this means recorded detections—even precise ones—do not necessarily indicate an immediate issue but provide a basis for informed water quality decisions.
Understanding 'Detected', 'Median', and 'Range' in the Sampling Record
In the Marion County public water record, 'detected' means the compound was measured above the reporting limit by laboratory instruments, not that the water is unsafe. 'Median' is the middle value of tested results, and 'range' shows the spread from lowest to highest detection. For 1,4-dioxane, the record shows zero detections above 0.07 µg/L, implying a median and range at or below this level. This interpretation helps households contextualize their own water tests if they pursue them.
Household Fixtures and Processes Most Affected by 1,4-Dioxane Presence
Because 1,4-dioxane is highly soluble and does not easily adsorb onto surfaces, it disperses uniformly in water. It can affect all water outlets but tends first to complicate uses involving direct consumption, such as drinking and cooking. Hot water systems do not remove this cyclic ether effectively through boiling. Showerheads, faucets, and appliances supply the same water quality, so understanding treatment options is important if testing indicates measurable levels in a home.
Among treatment technologies, the Fleck 1,4-Dioxane Filter is designed to work on the specific chemical properties of this solvent stabilizer. It ships ready to configure and uses a proven method suited to address the compound at household scale. Homeowners comparing treatment approaches should consider such targeted solutions after confirming their own water’s 1,4-dioxane content, since Marion County’s public record does not automatically indicate an issue.
In summary, Marion County’s public water system data shows no detected 1,4-dioxane above the reporting level, confirming the absence of any federally recognized health-based violation. Households weighing treatment choices should first test their own water for 1,4-dioxane presence. If addressed, technologies like the Fleck 1,4-Dioxane Filter provide a direct route to managing the cyclic ether in residential settings.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-09-24. 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 Keizer (OR4100744), OR: 30 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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