North Surrey Water Limited
Overall Water Quality supplied by North Surrey Water in 2000
A total of 13,318 tests were carried out by North Surrey Water in 2000. Of these tests, 99.90% complied with the Regulations.
Company Information Amount of Water Supplied: 139 Ml/d Consumers Supplied: 480,000 Areas of Supply: Part of Surrey and Middlesex Water Composition: 85% from rivers and reservoirs
15% from boreholes and aquifersTreatment Works: 4 Service Reservoirs: 22 Km of Mains: 2,500 Water Supply Zones: 14 Water Quality in Water Supply Zones, at Treatment Works, and in Service Reservoirs
Water supply zones
- In general, to be wholesome, water must comply with the standards set out in the Regulations. The Company carried out a total of 8,872 tests on samples taken in its 14 water supply zones. The table below includes only the parameters that breached the standard. All other parameters fully complied with the standards. Parameter meanings can be found at the beginning of this section.
- The last column indicates the number of failures in zones already covered by legally binding undertakings given by the Company to carry out remedial works to overcome the difficulty in meeting the individual standard.
Parameter
Total Samples taken
Samples not meeting the standard
Percentage
Number of failures already covered by Undertakings
Total coliforms
1,293
4
0.31
-
Iron
307
3
0.98
3
Treatment works
Three of the Company’s four treatment works (75%) complied fully with the relevant standards. Failures of the total coliform standard at the remaining works have resulted in consideration of enforcement action. Differences over the last three years in the number of treatment works, and samples from treatment works, in which coliforms or faecal coliforms were detected are not considered significant. Service reservoirs
At all of the Company's 22 service reservoirs, coliforms were absent from at least 95% of samples. There were no failures of the standard for faecal coliforms. There have been significant decreases over the last three years in the number of service reservoirs in which total coliforms were detected. All other differences are not considered significant. Company Audit and Inspection Link to expanded information (web site version)
- The Company was inspected or audited by DWI or its appointed consultants on five occasions in 2000. Where relevant, report summaries are available in the ‘Business and Technical’ section of DWI’s web site under ‘Audit and Inspection’.
Audit or Inspection
Date
Annual assessment of 1999 compliance data.
April / May
Audit of plumbosolvency treatment and control programmes of work
November
Audit trails of five samples
November
Follow-up of response to recommendations and arrangements for Cryptosporidium sampling
November
Inspection of distribution system improvement programme progress.
Ongoing
A number of recommendations for improvements were made, especially in relation to arrangements for sampling for Cryptosporidium. Incidents
- No events significantly affecting the quality of drinking water were notified to the Inspectorate by the Company during 2000.
Improvement Programmes
Carried Out by the Company
- No remedial programmes were due for full completion during 2000.
- The distribution system improvement programme, due for completion in 2007, is on-going. The Inspectorate is in discussions with the Company concerning the volume of work required.
Enforcement Action
- The table below indicates areas where DWI is considering, or has taken enforcement action for, breaches of regulations.
Parameter/Area
Number
Regulation Breached
Total coliforms
1 works
3(7)
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Drinking Water Inspectorate,
Floor 2/A1, Ashdown House, 123 Victoria Street, London, SW1E 6DE
Telephone : 020 7944 5956 - Facsimile : 020 7944 5969
E-mail: dwi_enquiries@detr.gov.uk
Published 11 July 2001
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