Dee Valley Water PLC
Overall Water Quality supplied by Dee Valley Water in 2000
A total of 12,808 tests were carried out by Dee Valley Water in 2000. Of these tests, 99.90% complied with the Regulations.
Company Information Amount of Water Supplied: 73 Ml/d Consumers Supplied: 257,100 Areas of Supply: Chester, Wrexham, Llangollen and surrounding areas of Denbighshire and Flintshire Water Composition: 96% from rivers and reservoirs
4% from boreholes and aquifersTreatment Works: 8 Service Reservoirs: 31 Km of Mains: 1,953 Water Supply Zones: 18 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 6,896 tests on samples taken in its 18 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
Turbidity
126
2
1.59
-
Nitrite
112
1
0.89
-
Aluminium
163
1
0.61
-
Iron
184
3
1.63
1
Manganese
158
1
0.63
-
Treatment works
Of the Company’s eight treatment works, seven (88%) complied fully with the relevant standards. Contraventions at the remaining works were considered trivial and unlikely to recur. Differences over the last three years in the number of treatment works, and samples from treatment works , in which coliforms were detected are not considered significant.Service reservoirs
At all of the Company's 31 service reservoirs, coliforms were absent from at least 95% of samples. Failures of the standard for faecal coliforms at two service reservoirs were considered trivial and unlikely to recur. Differences over the last three years in the number of service reservoirs, and samples from service reservoirs, in which coliforms were detected are not considered significant.Company Audit and Inspection Link to expanded information (web site version)
occasions in 2000. Where relevant, report summaries are available in the Business and Technical section of DWI’s web site under 'Audit and Inspection'.
- The Company was inspected or audited by DWI or its appointed consultants on seven
Title
Date
Annual assessment of 1999 compliance data.
April / May
Investigation of Computer Systems and associated Data Management for drinking water quality information appearing on the Public Record
August
Audit trails of five samples
November
Audit of plumbosolvency treatment and control programs of work
November
Review of procedures for operation and maintenance of the distribution network
November
Inspection of Dee Valley Water including arrangements for Cryptosporidium sampling and follow-up of recommendations made in the 1999 inspection report.
December
Inspection of distribution system improvement programme progress.
Ongoing
No major deficiencies were identified but a number of recommendations for improvements were made. These were in relation to analytical systems, computer security, regulatory Cryptosporidium sampling and procedures for operation and maintenance of the distribution network. Incidents
- The Inspectorate did not regard any of the events notified during 2000 by the Company as incidents in which drinking water quality demonstrably deteriorated.
Improvement Programmes Carried Out by the Company
- One remedial programme was due for full completion during 2000 and this was completed on schedule.
- The ongoing distribution system improvement programmes due for completion in 2004, which have been implemented by the Company, have been progressing satisfactorily.
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
Turbidity
1 zone
Regulation 3(3)(c)
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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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