If your tap water sometimes tastes different or if you have concerns about chemical contaminants, you might wonder about the presence of 1,4-Dioxane. Known as a cyclic ether and commonly used as a solvent stabilizer, 1,4-Dioxane can be found in trace amounts in groundwater sources. In Kitsap County, Washington, household water supplied by the Silverdale Water District #16 draws from groundwater and serves over 35,000 residents through more than 10,000 connections.
Why does 1,4-Dioxane move ahead of the solvent plume it stabilizes, and what does that mean for water downstream?
The cyclic ether, 1,4-Dioxane, behaves differently in groundwater compared to many contaminants. It travels faster and farther than the solvent plume it originally stabilized due to its high solubility and resistance to natural breakdown. This means that 1,4-Dioxane can appear ahead of other chemicals in groundwater flow, making it a challenging contaminant to track. For residents relying on groundwater sources in Kitsap County, this characteristic indicates that testing for 1,4-Dioxane should not depend solely on solvent detection.
Why do carbon filtration and boiling offer limited benefits for reducing this cyclic ether, and what technologies effectively address it?
Traditional treatment methods such as activated carbon filtration and boiling water do not significantly reduce 1,4-Dioxane. This is because the compound is highly soluble and does not adsorb well onto carbon media, and boiling does not volatilize it efficiently. Instead, documented technology specifically designed to manage 1,4-Dioxane in household water is available. Equipment such as the Fleck 1,4-Dioxane Filter ships ready to configure and uses advanced mechanisms suited to target this solvent stabilizer, offering a practical option for residential treatment.
Why do aesthetic secondary standards differ from health-based limits, especially regarding 1,4-Dioxane?
Aesthetic secondary standards address water qualities like taste, staining, and corrosivity rather than health risks. For 1,4-Dioxane, there is no federal maximum contaminant level (MCL); however, an EPA cancer risk reference concentration of 0.35 micrograms per liter (0.35 parts per billion) is used as a benchmark for potential health risk consideration. The Silverdale Water District #16's public records from 2013 to 2015 show no detections of 1,4-Dioxane above the reporting level of 0.07 micrograms per liter. Thus, the water system has no health-based violations on record related to this compound, and aesthetic guidelines do not apply to 1,4-Dioxane at detected low levels.
Why is a low-level detection reported to three decimal places, and what does precision mean for your household water?
Government sampling reports 1,4-Dioxane concentrations with high precision, often to three decimal places, to indicate exact measurements near detection limits. For the Silverdale Water District #16, none of the 22 samples taken detected 1,4-Dioxane above the minimum reporting level of 0.07 micrograms per liter. Reporting values in such detail helps define the range within which this solvent stabilizer might be present, though a detection itself does not indicate any problem. Household water quality can only be confirmed by testing an individual home's supply, as regional data reflects overall system conditions rather than specific household results.
How should a homeowner interpret the public water system's median and range of 1,4-Dioxane measurements?
The EPA's monitoring of the Silverdale Water District #16 found no detections of 1,4-Dioxane among 22 samples between December 2014 and June 2015. This means the median measurement was below the 0.07 micrograms per liter reporting threshold, and no variation above that limit was recorded. Homeowners reading this data should understand that while 1,4-Dioxane was not detected at reportable levels during this period, this does not guarantee zero presence in every household tap. Individual testing is necessary to determine if 1,4-Dioxane is present in a home’s water supply and to decide if a treatment approach like the Fleck 1,4-Dioxane Filter would suit their needs.
In summary, the public water system record for Kitsap County’s Silverdale Water District #16 reflects no health-based violations or reportable detections of 1,4-Dioxane in the drinking water it provides. These results cover over 10,000 connections and 35,000 people, sourced from groundwater. For detailed information or to verify current conditions, the EPA’s Safe Drinking Water Information System (SDWIS) public water system records are the authoritative source.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-06-17. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Silverdale Water District #16 (WA5379300), WA: 22 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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