The public water system serving Citronelle in Mobile County, Alabama, draws on groundwater sources to supply over 39,000 residents, including 19,568 service connections. This local groundwater inevitably reflects diverse environmental influences from its aquifer, and the South Alabama Utilities Water System (AL0000967) monitors its chemical makeup under federal programs to ensure compliance with health standards. Notably, monitoring for 1,4-dioxane—a cyclic ether used as a solvent stabiliser and sometimes detected in water sources affected by industrial or consumer product residues—provides a window into regional water quality concerns without implying specific conditions at any single tap.
How Do Landfill Leachate, Degreasing Sites, and Consumer Products Influence 1,4-Dioxane Records Here?
1,4-Dioxane can enter groundwater through several pathways. Historically, landfill leachate can carry traces of this compound if materials disposed of contain it. Sites where industrial degreasing processes occurred, which used cleaning agents containing this solvent stabiliser, may contribute residual 1,4-dioxane to the aquifer. Additionally, widespread consumer products like detergents and cosmetics sometimes contain small amounts of 1,4-dioxane as a byproduct, which can enter water systems through wastewater and infiltration. These multiple sources explain why monitoring programs are essential despite no violations recorded by EPA for this system.
Why Are 1,4-Dioxane Detections Reported to Three Decimal Places, and What Does That Precision Mean?
The detection threshold for 1,4-dioxane in federal surveys is 0.07 micrograms per liter (µg/L), equivalent to 0.07 parts per billion (ppb). Reporting measurements to three decimal places allows clear identification of whether concentrations are below or above this threshold. Importantly, measurements recorded as 'not detected' mean that the constituent was below this level and not necessarily absent. Such precision supports accurate tracking over time, but because there is no federal maximum contaminant level (MCL) for 1,4-dioxane, these figures are informative rather than regulatory.
What Role Do Plumbing Material and Age Play Separate From Source Water?
While federal monitoring reflects the water as it leaves the treatment plant or wellhead, plumbing materials and the age of a building’s pipes can influence water quality at the tap. For constituents like 1,4-dioxane, which originate from source contamination rather than plumbing corrosion or leaching, the local water system record is the primary concern. Nevertheless, older plumbing may alter other water characteristics, so testing water directly from household taps can clarify whether local plumbing affects water quality independently of source water content.
What Does Seasonal or Multi-Year Variation Look Like in This Record?
The monitoring data for 1,4-dioxane in this area come from samples collected between September 2013 and March 2014 as part of the EPA’s third Unregulated Contaminant Monitoring Rule (UCMR 3). This snapshot reveals no detections above the reporting level. However, environmental factors such as rainfall, groundwater flow variations, and seasonal industrial activity can affect dissolved concentrations over time. Continued or periodic testing is beneficial for understanding any changes beyond this timeframe.
How Many Samples and Wells Support These Numbers, and What Does a Small Sample Mean?
For the South Alabama Utilities Water System, 32 samples were analyzed for 1,4-dioxane during UCMR 3 monitoring. While this number provides reasonable coverage of the system’s groundwater sources, it does not capture every variation or localized influence. A smaller sample size means that rare or transient occurrences might not be detected. Therefore, individual households can benefit from targeted testing to establish their own tap water quality concerning 1,4-dioxane.
What Single Test Should You Order to Settle Your 1,4-Dioxane Question?
The most direct way to assess your water’s 1,4-dioxane concentration is to request a laboratory analysis of a tap water sample specifically for this cyclic ether. Given that regional government data show no detections above the 0.07 µg/L threshold, a laboratory test can confirm if your individual water aligns with this record or if treatment steps might be prudent. When treatment is desired, the Pentair 1,4-Dioxane Filter ships ready to configure and is designed to address this solvent stabiliser effectively, providing a tailored response to your household’s demand.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-03-17. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for South Alabama Utilities Water System (AL0000967), AL: 32 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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