DWI "disturbed" by high rate of water disinfection failures

The Drinking Water Inspectorate (DWI) has reported a "disturbingly high level" of disinfection failures in a review of incidents affecting tap water quality since 1990. The most frequent cause of incidents was operational failures by water companies.

Water companies are obliged to inform the DWI of incidents likely to affect the quality or sufficiency of water supplies, or which give rise to a significant risk to health. The DWI recently conducted a review of 347 incidents reported between 1990 and 1996 and sent the results to companies in an information letter. Some incidents in 1995 and 1996 are still under investigation so statistics for these years are incomplete.

The commonest ca

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