Running tap

Regular checks and quality tests are made by the Drinking Water Inspectorate (DWI) to maintain high standards.

The tests cover:

  • bacteria chemicals such as nitrates and pesticides
  • metals such as lead
  • the way water looks and tastes.

Keeping your water supply healthy

By following our tips you can keep your water supply up to standard and prevent and bacterial growth or contamination.

  • Ensure that the thermostat on any domestic hot water cylinders in your home is set at 60ºc  - don’t reduce it as bacteria can multiply at lower temperatures
  • Do not reduce the hot water thermostat setting on combi boilers or multi-point water heaters
  • If you are away from home for long periods, heat up your system to the normal temperature when you return home and run each tap for at least five minutes
  • Cold taps should be flushed until the water runs cold
  • Clean tap spouts in baths and sinks by wiping with a dilute bleach solution – they can become contaminated by external sources.


  • If you have a shower fitted with a flexible hose, make sure that a hose-retaining ring is fitted to prevent the shower head falling into your bath water 
  • Don’t use rubber push-on shower hoses on bath taps
  • Clean your shower head regularly using a nylon brush then soak in a bleach solution.

Other fittings and appliances

If you have an outside tap fitted any appliances you buy to connect to the water supply must comply with the Water Regulations.

More information 

Contact KNH if you have any concerns about water issues in your home.

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