Understanding 1,4-Dioxane in Bexar County Water: Low-Level Detection Details and Household Concerns
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WSP Whole House 1,4-Dioxane Reduction System
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Background on Bexar County's Water Supply
Bexar County's water is supplied primarily by surface water sources managed by the San Antonio Water System (SAWS), which serves over 2.6 million people through more than 880,000 connections. This centralized system treats surface water and distributes it through a network ensuring regulatory compliance and consistent quality at the municipal level.
Why a Low-Level 1,4-Dioxane Detection Uses Three Decimal Places
Government data records 1,4-dioxane concentrations in micrograms per liter (µg/L), also expressed as parts per billion (ppb), with precision to three decimal places to capture very low trace amounts. Such measurements reflect sensitive instrumentation capable of detecting even minor presence. A reported value like 0.58 µg/L means the analytical method quantified the solvent stabiliser with high accuracy, not that this is a threshold or limit. The precision simply documents the detection's detail for monitoring purposes.
Sources of 1,4-Dioxane in the Bexar County Water Record
The cyclic ether known as 1,4-dioxane can originate from several human activities. Landfill leachate can introduce it as waste breaks down. Industrial degreasing operations may release residues, as the compound stabilizes solvents used in cleaning. Additionally, consumer products such as certain detergents and cosmetics may contribute trace quantities. These combined sources influence regional water monitoring results without implying contamination of any individual home’s water.
Pathways of 1,4-Dioxane into the Local Water Supply
In Bexar County, 1,4-dioxane can enter surface waters through runoff and leachate percolation. From surface water, standard municipal treatment processes prepare the water for distribution, but this cyclic ether's chemical properties make it resistant to some conventional treatments. Once treated, water travels through the distribution system to household taps, where low-level traces may persist, as indicated by sampling records.
Interpreting the Median and Range Reported for 1,4-Dioxane
The EPA’s monitoring from 2013 to 2015 recorded 70 measurements in this system. Only one detected 1,4-dioxane above the reporting level of 0.07 µg/L, reaching 0.58 µg/L. The median of those detections is also 0.58 µg/L. This means most samples showed no measurable amount, and a single detection represents the highest quantified trace. Since no federal maximum contaminant level exists for 1,4-dioxane, these numbers are strictly informative, not regulatory.
Addressing 1,4-Dioxane in Residential Water
Because 1,4-dioxane resists common treatment methods, specialized water treatment technologies designed for household use are available. One such option is the C-Series 1,4-Dioxane Filter, which ships ready to configure and uses targeted processes to reduce cyclic ether concentrations at the tap. This filter operates by neutralizing or removing solvent stabilizers, helping address 1,4-dioxane presence in regions with documented detections like Bexar County.
Summary and Source Reference
Government data for the San Antonio Water System in Bexar County reflects large-scale monitoring results for 1,4-dioxane in surface water-derived municipal supplies, not measurements of individual homes. This record indicates trace detections but no safety violations. For specific household water quality, direct testing is necessary. The EPA’s public water system data portal provides full details on occurrence and monitoring.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-04. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for San Antonio Water System (TX0150018), TX: 70 results across 1 listed contaminants, 1 detections above the reporting level; no federal MCL; EPA cancer risk reference concentration 0.35 ug/L