Index of Contents:
- Introduction
- Coliform Bacteria
- Pesticides
- Lead
- Iron and Manganese
- Cryptosporidium
- Drinking Water Quality Incidents
- Further Information
1. Introduction
The Drinking Water Inspectorate (DWI) checks on behalf of the Government that water companies supply water that is safe to drink. This leaflet summarises the results of our checks on Sutton and East Surrey Water PLC during 2001. You should read it alongside DWI’s leaflet, How Good is the Drinking Water? which gives more details on the standards and tests. This is available free of charge and on the DWI web site at www.dwi.gov.uk..
Sutton and East Surrey Water continues to supply you with drinking water of a high quality. In 2001, 99.78% of more than 24,400 tests met the drinking water standards. This is below the overall figure for England and Wales of 99.86%. The tests are carried out on samples taken from water treatment works, service reservoirs and consumers’ taps.
None of the failures of the standards in 2001 were considered harmful to consumers’ health. Each failure was assessed and, where necessary, Sutton and East Surrey Water has taken action to prevent further failures.
Although the 2001 results are good, there are some matters which may concern you. These are detailed below including any steps taken by Sutton and East Surrey Water to further improve its performance.
2. Coliform bacteria
Occasionally, coliform bacteria may be found in drinking water samples; these are not considered harmful to consumers’ health. If coliform bacteria are detected, Sutton and East Surrey Water investigates immediately.
During 2001, on one occasion, low numbers of coliform bacteria were detected in the water leaving a single water treatment works. No coliform bacteria were detected in water leaving any of the Company’s service reservoirs.
Coliform bacteria were detected in 0.4% of the water samples taken from consumers’ taps. Many of these failures may have been due to the condition of the tap and not the water itself. The standard permits 5% of samples in a water supply zone to contain coliform bacteria. All zones met the standard.
3. Pesticides
Sutton and East Surrey Water carried out more than 1,900 tests for individual pesticides during 2001 and all samples met the stringent standard. This reflects the significant investment in recent years to remove pesticides from drinking water.
4. Lead
Samples do occasionally fail the standard for lead, even where additional treatment has been installed to reduce the amount of lead picked up by water from pipework. These failures are usually due to the consumers’ water pipes being made of lead. Whenever a failure occurs, Sutton and East Surrey Water informs the householder of any problems and advises of any action that can be taken to reduce lead levels in the water at their kitchen tap.
If you are concerned about the possibility of lead in your drinking water, you should contact Sutton and East Surrey Water to see whether there is a problem. A leaflet about lead in drinking water is available from DWI free of charge and can also be found on the DWI web site.
Only two of 1,728 samples taken by Sutton and East Surrey Water failed the standard for lead during 2001.
5. Iron and manganese
These two parameters provide a good indication of the overall condition of the mains used to distribute drinking water throughout the area of supply.
During 2001, only four of 368 samples taken for iron failed the standard. No samples failed the standard for manganese. This reflects the impact of the renovation programme being carried out by Sutton and East Surrey Water to its distribution system.
During 2000 and 2001, the Company renovated 49 km of water mains. The programme covers the areas affected by the failures, and is ongoing with Sutton and East Surrey Water being required to renovate a further 150 km of mains by 2005.
6. Cryptosporidium
Cryptosporidium is a tiny micro-organism that can sometimes cause a form of diarrhoea called cryptosporidiosis. There are a number of sources of Cryptosporidium other than drinking water, New regulations require water companies to sample continuously and analyse daily for Cryptosporidium in the treated water at potentially vulnerable sites.
It is a criminal offence to exceed the new treatment standard for Cryptosporidium.
During 2001, Sutton and East Surrey Water fulfilled its requirement to carry out continuous sampling and monitoring at two of its sites that were identified as being at significant risk from Cryptosporidium. The Company is required to tell DWI of any failures to meet the treatment standard. Sutton and East Surrey Water reported no failures during 2001.
In addition, as part of the new regulations, the Company is committed to programmes of work to reduce any potential risk from Cryptosporidium at two sites.
7. Drinking Water Quality Incidents
DWI regarded two of the events notified during 2001 by Sutton and East Surrey Water as incidents. The details are shown in the table below.
The incident assessed by DWI was of short duration and Sutton and East Surrey Water took remedial action. One incident remains under consideration.
Summary of water quality incidents reported in 2001
Type of incident
No.of incidents
Assessment completed
Areas affected
Supply of discoloured water
1
No
Morden (October)
Partial failure of disinfection system
1
Yes
Godstone (July)
8. Further information
If you would like more information about drinking water quality the following leaflets are available free of charge from DWI and can also be found on the DWI web site:
What do we do?
How good is the drinking water?
Problems with your drinking water
Chlorine, smell and taste
Discoloured water
Lead in drinking water
Private water supplies
Water hardness
Tap water, where does it come from and how is it made safe to drink?
Using lead-free solder for drinking water fittings
DWI reports on each water company
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Drinking Water Inspectorate,
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Telephone : 020 7944 5956 - Facsimile : 020 7944 5969
E-mail: dwi.enquiries@defra.gsi.gov.uk
Published 10 July 2002
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