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Seasonal Variation of Water Quality in Unregulated Domestic Wells

Sammy Farag by Sammy Farag
August 1, 2019
in Water Filter
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Yoshira Ornelas Van Horne 1,*,Jennifer Parks 2,Thien Tran 3,Leif Abrell 3,4,Kelly A. Reynolds 1 and Paloma I. Beamer 1
1
Mel and Enid Zuckerman College of Public Health, University of Arizona, 1295 N. Martin Ave., Tucson, AZ 85724, USA
2
Friends of the Santa Cruz River, P.O. Box 4275, Tubac, AZ 85646, USA
3
Department of Soil, Water & Environmental Science, University of Arizona, Tucson, AZ 85721-0038, USA
4
Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0041, USA
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(9), 1569; https://doi.org/10.3390/ijerph16091569
Received: 12 April 2019 / Revised: 30 April 2019 / Accepted: 1 May 2019 / Published: 5 May 2019
(This article belongs to the Special Issue Drinking Water and Health Risks)

Abstract

In the United States (U.S.), up to 14% of the population depend on private wells as their primary drinking water source. The U.S. government does not regulate contaminants in private wells. The goals of this study were to investigate the quality of drinking water from unregulated private wells within one mile (1.6 kilometers) of an effluent-dominated river in the arid Southwest, determine differences in contaminant levels between wet and dry seasons, and identify contributions from human sources by specifically measuring man-made organic contaminants (perfluorooctanoic acid (PFOA), perfluorooctane sulfate (PFOS), and sucralose). Samples were collected during two dry seasons and two wet seasons over the course of two years and analyzed for microbial (Escherichia coli), inorganic (arsenic, cadmium, chromium, copper, lead, mercury, nitrate), and synthetic organic (PFOA, PFOS, and sucralose) contaminants. Arsenic, nitrate, and Escherichia coli concentrations exceeded their respective regulatory levels of 0.01 mg/L, 10 mg/L, and 1 colony forming unit (CFU)/100 mL, respectively. The measured concentrations of PFOA and PFOS exceeded the respective Public Health Advisory level. Arsenic, PFOA, PFOS, and sucralose were significantly higher during the dry seasons, whereas E. coli was higher during the wet seasons. While some contaminants were correlated (e.g., As and Hg ρ = 0.87; PFOA and PFOS ρ = 0.45), the lack of correlation between different contaminant types indicates that they may arise from different sources. Multi-faceted interventions are needed to reduce exposure to drinking water above health-based guidelines.

https://www.mdpi.com/1660-4601/16/9/1569

The post Seasonal Variation of Water Quality in Unregulated Domestic Wells appeared first on Facts About Water.

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