HD Cymru
Water Quality
Check my water quality

Check my water quality

If you'd like to get in-depth information about the water we supply to you and what's in it, you can enter your postcode in our water quality checker to read a list that details your water hardness, where it comes from, and what minerals it contains.

Check my Water Quality

Postcode

Please enter a valid postcode

Last 12 months Last Quarter Last Month

Data updated upto May 31 2025

We could not find information about your area, this could be because of one of the following reasons:

The postcode entered is incorrect (please double check).
The postcode may be new and it may have been generated after the water quality data was gathered and published.
The postcode entered may exist outside of the Hafren Dyfrdwy Ltd region or may have its water supplied by another water company (e.g. Severn Trent Water).

Source of water

Water quality

Depending on its origin, water can contain a variety of natural mineral salts. All water in supply is carefully purified at modern treatment plants to ensure that potential contaminants are removed in order to meet strict UK and European standards

Quality control

Each year we take many thousands of samples direct from the customers' taps to ensure its quality. The table below shows typical values for your area. Individual results may vary slightly due to natural changes in the raw water, and also to changes which occur within the domestic plumbing system

Download a detailed report on the quality of water in your area

Key for units

mg/l

is equivalent to one part per million

μg/l

is equivalent to one part per billion

Dilution number

is a standard method for detecting taste and odour

mg/l Pt/Co

is a reference scale for assessing the clarity of the water

μS/cm

measures the natural mineral composition

Hardness Level

the three measures shown are the most common used by washing machine manufactures

Less than

means that this is the lowest value that the high quality equipment can measure

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We hope you've noticed the improvements to our website. We're still working hard on this area so please bear with us for just a bit longer.

Check my water quality

Check my Water Quality

We could not find information about your area, this could be because of one of the following reasons:

For more help or advice call us on 0800 085 8033 - this line is open 24 hours a day, seven days a week.