Government water-quality records for the Lakehaven Utility District, which serves over 148,000 people in King County, show no detections of 1,4-dioxane above 0.07 micrograms per liter (µg/L), or 0.07 parts per billion (ppb), during the 2013-2015 EPA UCMR3 monitoring period. This means that while monitoring for this cyclic ether, the federal survey found no measurable presence of the solvent stabiliser above the reporting level in this public water system.
Difference Between UCMR3 Detection and State Notification Levels for Dioxane
The EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) collects occurrence data to inform future regulations but does not establish legal safety limits for dioxane levels. Reporting levels are thresholds for laboratory detection, not health-based enforcement levels. State notification levels for dioxane, if present, may serve as advisory benchmarks but differ from the federal survey’s detections. In King County’s Lakehaven Utility District, no sample exceeded the UCMR3 reporting threshold. Therefore, no official notification or regulatory action is mandated based on these results.
Why 1,4-Dioxane Moves Ahead of the Solvent Plume It Stabilised
1,4-Dioxane is a cyclic ether commonly used to stabilise solvents. Unlike some heavier contaminants, dioxane is highly mobile and resists natural breakdown, allowing it to travel farther in groundwater than the solvent plume it accompanied initially. This means that areas downgradient of a source may detect the cyclic ether before other related contaminants, influencing how water treatment needs are assessed and prioritized for affected residences.
Comparing This Area’s Record With a Neighbouring County’s Without Overreading It
While neighboring counties might show different patterns or occasional detections of 1,4-dioxane, the absence of measurable levels in Lakehaven Utility District’s record suggests distinct local source and transport conditions. Any comparison should avoid assuming the same water quality for individual wells or homes. Testing is necessary to confirm conditions for any specific household water supply.
How the Constituent Enters Groundwater or the Distribution System in This Region
The cyclic ether can enter public water sources primarily through historical industrial discharge sites, landfill leachate, or consumer-product residues. In King County, surface water sources supplying the Lakehaven Utility District could be influenced by upstream land uses that affect constituent presence. However, the district's sampling record indicates no detectable dioxane above reporting levels, reflecting either effective source control, dilution, or treatment practices before distribution.
Seasonal or Multi-Year Variation in the Record
The Lakehaven Utility District's EPA UCMR3 monitoring spanned from August 2013 to September 2014. No measurable dioxane was found during this period, but seasonal or longer-term variations are possible in source waters generally. The absence of detections over this monitoring year suggests that any fluctuations remain below the reporting threshold for the public water system during the sampled timeframe.
Sample Size and What It Means for Interpreting These Figures
The 34 samples taken represent a statistically significant but limited snapshot of the public water system’s quality. While no detections above 0.07 µg/L appeared, this does not guarantee zero presence at all times or locations. Individual household water quality can only be known through specific testing of that water supply. The sample size reflects system-wide monitoring rather than localized well measurements.
For households identifying a need to address potential 1,4-dioxane presence based on measured demand, the Pentair 1,4-Dioxane Filter ships ready to configure. This product is a documented solution designed to address residential water treatment requirements for this cyclic ether according to the demand figures the homeowner measures directly from their water.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-09-30. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Lakehaven Utility District (WA5341997), WA: 34 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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