Cited by 123Water Treatment and DisinfectionWater Quality and Resources StudiesToxic Organic Pollutants Impact

1,4-Dioxane drinking water occurrence data from the third unregulated contaminant monitoring rule

Adamson, David T., Piña, Elizabeth A., Cartwright, Abigail E., Rauch, Sharon R., Hunter Anderson, R., Mohr, Thomas, Connor, John A.·2017·Science of The Total Environment

Abstract

This study examined data collected from U.S. public drinking water supplies in support of the recently-completed third round of the Unregulated Contaminant Monitoring Rule (UCMR3) to better understand the nature and occurrence of 1,4-dioxane and the basis for establishing drinking water standards. The purpose was to evaluate whether the occurrence data for this emerging but federally-unregulated contaminant fit with common conceptual models, including its persistence and the importance of groundwater contamination for potential exposure. 1,4-Dioxane was detected in samples from 21% of 4864 PWSs, and was in exceedance of the health-based reference concentration (0.35μg/L) at 6.9% of these systems. In both measures, it ranked second among the 28 UCMR3 contaminants. Although much of the focus on 1,4-dioxane has been its role as a groundwater contaminant, the detection frequency for 1,4-dioxane in surface water was only marginally lower than in groundwater (by a factor of 1.25; p<0.0001). However, groundwater concentrations were higher than those in surface water (p<0.0001) and contributed to a higher frequency of exceeding the reference concentration (by a factor of 1.8, p<0.0001), indicating that surface water sources tend to be more dilute. Sampling from large systems increased the likelihood that 1,4-dioxane was detected by a factor of 2.18 times relative to small systems (p<0.0001). 1,4-Dioxane detections in drinking water were highly associated with detections of other chlorinated compounds particularly 1,1-dichlorethane (odds ratio=47; p<0.0001), which is associated with the release of 1,4-dioxane as a chlorinated solvent stabilizer. Based on aggregated nationwide data, 1,4-dioxane showed evidence of a decreasing trend in concentration and detection frequency over time. These data suggest that the loading to drinking water supplies may be decreasing. However, in the interim, some water supply systems may need to consider improving their treatment capabilities in response to further regulatory review of this compound.

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Crossref · 10.1016/j.scitotenv.2017.04.085

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Authors
Adamson, D. T., Piña, E. A., Cartwright, A. E., Rauch, S. R., Hunter Anderson, R., Mohr, T., & Connor, J. A.
Affiliations
  • GSI Environmental (United States) (US)
  • Rice University (US)
Corresponding author
Adamson, David T.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2017-10
Volume
596-597
Pages
236-245
ISSN
0048-9697 (ISSN-L)
OpenAlex
W2605572428
Cited by
123
References
27
Citations by year
2026: 8 · 2025: 12 · 2024: 14 · 2023: 16 · 2022: 20 · 2021: 14 · 2020: 10 · 2019: 14 · 2018: 10 · 2017: 4 · 2014: 1
FWCI
5.62
Type
journal article
Language
en
Open access
closed
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
Funders
GSI Environmental Inc
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
  • Physical Sciences › Environmental Science › Water Science and Technology › Water Quality and Resources Studies
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
Keywords
1,4-dioxane, drinking water contamination, groundwater contamination, surface water contamination, chlorinated solvents, 1,1-dichloroethane, drinking water standards, detection frequency, temporal trends, water treatment, public water supply systems
MeSH terms
Dioxanes, Environmental Monitoring, United States, Water Pollutants, Chemical, Water Supply, Groundwater, Drinking Water

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