Observations placeholder

Contamination of American drinking water with bacteria

Identifier

008347

Type of Spiritual Experience

None

Background

background paper

Escherichia coli can cause meningitis and pneumonia

Coliform bacteria are a commonly used bacterial indicator of sanitary quality of foods and water. They are defined as rod-shaped Gram-negative non-spore forming bacteria.  Their presence is used to indicate that other pathogenic organisms of fecal origin may be present in a sample. Such pathogens include bacteria, viruses, or protozoa and many multicellular parasites. Typical genera include:

  • Citrobacter,
  • Enterobacter
  • Hafnia
  • Klebsiella
  • Fecal coliform:
  • Escherichia

They can cause lung diseases and autoimmune diseases

A description of the experience

J Water Health. 2013 Jun;11(2):244-55. doi: 10.2166/wh.2013.152.  Quantitative analysis of microbial contamination in private drinking water supply systems.  Allevi RP1, Krometis LA, Hagedorn C, Benham B, Lawrence AH, Ling EJ, Ziegler PE.  Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA 24061-0303, USA.

Over one million households rely on private water supplies (e.g. well, spring, cistern) in the Commonwealth of Virginia, USA.

The present study tested 538 private wells and springs in 20 Virginia counties for total coliforms (TCs) and Escherichia coli along with a suite of chemical contaminants. A logistic regression analysis was used to investigate potential correlations between TC contamination and chemical parameters (e.g. NO3(-), turbidity), as well as homeowner-provided survey data describing system characteristics and perceived water quality.

Of the 538 samples collected, 41% (n = 221) were positive for TCs and 10% (n = 53) for E. coli.

Chemical parameters were not statistically predictive of microbial contamination. Well depth, water treatment, and farm location proximate to the water supply were factors in a regression model that predicted presence/absence of TCs with 74% accuracy.

Microbial and chemical source tracking techniques (Bacteroides gene Bac32F and HF183 detection via polymerase chain reaction and optical brightener detection via fluorometry) identified four samples as likely contaminated with human wastewater.

PMID:  23708572

The source of the experience

PubMed

Concepts, symbols and science items

Concepts

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Science Items

Activities and commonsteps

Commonsteps

References