Water quality zone reports
All companies supplying drinking water must comply with the Water Supply Regulations 2010. For monitoring purposes, samples are collected and analysed at all stages of distribution from treatment works, service reservoirs, and randomly selected customers taps. These samples form part of an extensive sampling programme undertaken to ensure the continuing wholesomeness of the supply and full compliance with the Regulations.
Our area is divided into 19 water quality zones. Each of these zones is supplied either by a single source or a group of sources that are blended within service reservoirs.
Each of our quality zones has its own Water Quality Report. You can now find these reports online, either by following the steps below, or if your computer has a Flash plug-in, you can use our simple interactive map.
Our interactive map for your water quality reports
If you prefer - use our list-based reports
You can do this by following these three steps:
- 1. Open our Water Quality Zones PDF document
- 2. Find the code for your area by looking up your nearest town on the list.
- 3. Use the code to find the report on the list below, then open the water quality report for that area.
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- What do the test results mean?
- If you would like information on the water quality within your water supply zone, the next section explains the technical words used in the Water Quality Reports.
- Heading This shows the name of the zone (e.g Shavers End 2) and type of parameter (test) covered by the report.
- Units The concentration or value is expressed in different units. Most of the parameters sampled are in milligrams per litre (mg/l) or micrograms per litre (µg/l). These are very small amounts. One mg/l is one part in 1,000,000 parts of water (or 0.0001%). One µg/l is one part in 1,000,000,000 parts of water (or 0.0000001%)
- Prescribed Concentration or Value (PCVs) These standards are set down in the Water Supply (Water Quality) Regulations 2000 in line with European (EC) requirements. They are the acceptable levels of certain elements, compounds or substances which are allowed in drinking water. Usually this is a maximum allowed level but occasionally it can be a minimum allowed level.
- Number of samples This is the number of samples collected from the zone during a period of time, usually the previous 12 months.
Number of samples > PCV This is the number of samples that has breached a parameter limit or PCV.
- % > PCV This column shows the percentage of results, which failed the standard for each parameter sampled. This is expressed as a percentage of the total number of samples for that parameter. For example, 2% shows that 1 sample in 50 failed. In most cases you will see a value of 0, which demonstrates that the water has met the standard every time a sample was collected.
- Maximum, mean and minimum This demonstrates a summary of the results from the tests over the time period. The minimum, mean and maximum concentrations are shown. The < symbol shows that the value recorded was below measurable limits. The mean is calculated by adding up all the results and dividing it by the total number of tests for that parameter.
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