Language > Cymraeg

Search the site:

Notice a leak

Freephone: 0800 2987112

Taste & Odour

Chlorine taste & odour

Chlorine has been used by the water industry for over 100 years to disinfect the water and is completely safe at the levels used in water treatment. The World Health Organisation limit for chlorine in drinking water is 10 times higher that the amount found in Dee Valley's water.

A small amount of residual chlorine is present in the water reaches customers taps to ensure that water quality is maintained throughout the distribution network.

Chlorine levels although tightly controlled at the treatment works can fluctuate in the distribution system due to varying demand.

Some customers can be more sensitive to chlorine taste and odour and may detect these fluctuations in chlorine levels.

If you find the chlorine taste and odour unacceptable, then try placing a covered jug of water in the fridge for 20 minutes as this will help to reduce the chlorine taste on the water. Please ensure that water is discarded after 24 hours.

Earthy, musty tatse & odour

An earthy, musty taste normally originates from standing water and can occur when a customers internal stop tap is not fully open.

If you are experiencing an earthy, musty taste on your water supply, check that your internal stop tap is fully open, it is usually found under your kitchen sink. Try flushing the supply afterwards by running the cold tap for several minutes.

Chemical, plastic tatse & odour

A chemical taste to water can be due to several different factors. If you only notice the taste on water after boiling it may be due to the seal around the heating element on the kettle reacting with chlorine in the water. Try boiling some water in a saucepan to see if the taste problem still occurs.

Washing machines and dishwashers that are plumbed in directly to the mains can cause taste issues due to back siphonage of water that has been in contact with the rubber hoses used to connect them to the mains water. This taste and odour may be present on both cold and boiled water and will usually be more noticeable on hot drinks.

To test if you are experiencing this problem, try to close the isolating valves on your dishwasher, washing machine when not in use. Run the cold water tap for several minutes to flush the supply and then try the water. If the taste and odour is no longer present then a possible solution is the fitting of non-return (single check) valves to the join between the rubber hose and your water pipe. Please ensure any fitting used are Water Regulations Advisory Scheme (WRAS) approved, this means they have been tested to ensure they do not affect water quality.