Improvement programmes

Water companies, if required by the Inspectorate or with the agreement of the Inspectorate, can put in place programmes of remedial action to improve drinking water quality whenever these are necessary.

List of current Improvement Programmes by company.

Programmes of work arise in four ways:

  • as a result of the process for setting price limits for a five year period (known as the price review process);
  • as a result of enforcement for contraventions of the drinking water standards for parameters in the regulations; and
  • as a result of enforcement for issues arising out of an assessment by the Inspectorate of a drinking water quality incident or technical audit;
  • following the identification of a risk to health through a risk assessment of a water supply system.

More detail is provided in the Guide to Improvement Programmes.


The Secretary of State or Welsh Ministers may notify a water undertaker that, for specific water supply zones, a radioactive parameter need not be monitored, providing those parameters (Indicative Dose, Tritium, and Radon) are below the respective parametric values.

List of current Radioactivity Notices by company.

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