The microbiological quality of potable water on board ships docking in the UK and the Channel Islands: An association of Port Health Authorities and Health Protection Agency Study

P. Grenfel, Christine L. Little*, S. Surman-Lee, M. Greenwood, J. Averns, S. Westacott, C. Lane, Gordon Nichols

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Providing safe potable water onboard vessels presents particular challenges and contamination can occur directly from source waters as well as during loading, storage and distribution. Between May and October 2005, 950 potable water samples were collected from 342 ships docking at ports. Comparison with Guidelines found 9% of samples contained coliforms, Escherichia coli or enterococci and 2.8% had faecal indicators (E. coli or enterococci). Action levels of aerobic colony count (ACC) bacteria were detected in 20% (22°C) and 21.5% (37°C) of samples. ACC results from one-off sampling are not informative as this does not enable port health authorities to monitor ACC trends. They should be removed as a routine criterion for remedial action and vessels should adopt the WHO Water Safety Plan approach, whilst continuing to monitor water quality with public health-based indicators (e.g. chlorine residual, coliforms, E. coli and enterococci). Logistic regression analyses identified practices associated with water quality. Practices protective against coliforms, E. coli or enterococci in potable supplies were: good hose hygiene, processing water onboard, maintaining free chlorine residual at ≥0.2 mg/L. This emphasizes the importance of good hygiene during potable water loading and maintaining adequate disinfection of supplies onboard.

Original languageEnglish
Pages (from-to)215-224
Number of pages10
JournalJournal of Water and Health
Volume6
Issue number2
DOIs
Publication statusPublished - Jun 2008

Keywords

  • Bacterial indicators
  • Potable water
  • Public health
  • Ships
  • Water quality

Fingerprint

Dive into the research topics of 'The microbiological quality of potable water on board ships docking in the UK and the Channel Islands: An association of Port Health Authorities and Health Protection Agency Study'. Together they form a unique fingerprint.

Cite this