CRYPTOSPORIDIUM IN DRINKING WATER - SURVEY OF OCCURRENCE
Report No DWI0264

JUN 1991

SUMMARY

The final three months of the national survey has been completed with sampling of the rivers and borehole sources. Full quality assurance of the analysis has been completed and parallel epidemiological studies have proceeded under the direction of CDSC with funding from DoE.

The period has again shown low levels of oocysts in the river sources and no positive results in the boreholes. No second stage investigations have therefore been carried out on the river sites to identify the sources of oocysts. Overall in the 12 month period oocysts have been low or absent in all sources. No outbreaks of cryptosporidiosis have been detected in the areas served by the sources surveyed as shown by the questionnaire returns to CDSC. The final report on the survey will be prepared with more detailed examination of the positive results.

The detailed survey on Loch Lomond has been put in hand with joint funding from FWR and Central Scotland Water Development Board. Quality assurance will also be funded by DoE. It is hoped that this will be complemented by the proposed survey by the NRA in the South West Region to examine occurrence of cryptosporidium in an intensive agricultural catchment.

Copies of this report may be available as an Acrobat pdf download under the 'Pre 2000 Reports' heading on the DWI website.