Chief Inspector's Report 2002
5 Cholderton and District Water Company Limited
| Overall Water Quality supplied by Cholderton and District Water Company Limited in 2002 | |||||||||||||||||||||
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Water Quality at Treatment Works, in Service Reservoirs and in Water Supply Zones
To be wholesome, water must comply with the standards for the parameters set out in the Water Supply (Water Quality) Regulations 1989. In 2002, the Company carried out a total of 547 tests on samples taken at water treatment works, from service reservoirs and in water supply zones and of these, 99.82% complied with the relevant water quality standards set down in the Regulations. A list of the parameters, the relevant standards and their significance can be found at the beginning of this section.
Water Quality leaving Treatment works
2002 |
2001 |
2000 |
||
| Number of water treatment works | 1 |
1 |
1 |
|
| COLIFORMS | ||||
| Total number of tests | 51 |
52 |
52 |
|
| - | number containing coliforms | 0 |
0 |
0 |
| - | % containing coliforms | 0.00% |
0.00% |
0.00% |
| Treatment works with coliforms detected | 0 |
0 |
0 |
|
| - | % of all works with coliforms detected | 0.00% |
0.00% |
0.00% |
| FAECAL COLIFORMS | ||||
| Total number of tests | 51 |
52 |
52 |
|
| - | number containing faecal coliforms | 0 |
0 |
0 |
| - | % containing faecal coliforms | 0.00% |
0.00% |
0.00% |
| Treatment works with faecal coliforms detected | 0 |
0 |
0 |
|
| - | % of all works with faecal coliforms detected | 0.00% |
0.00% |
0.00% |
There were no failures of the coliforms and faecal coliforms standards at the Company's works in 2002.
Cryptosporidium
The Company has no sites for regulatory Cryptosporidium monitoring.
Water Quality in Service Reservoirs
2002 |
2001 |
2000 |
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| Number of service reservoirs | 1 |
1 |
1 |
|
| COLIFORMS | ||||
| Total number of tests | 52 |
52 |
52 |
|
| - | number containing coliforms | 0 |
1 |
0 |
| - | % containing coliforms | 0.00% |
1.92% |
0.00% |
| Service reservoirs with coliforms detected | 0 |
1 |
0 |
|
| Service reservoirs with coliforms detected | 0 |
0 |
0 |
|
| in more than 5% of tests | ||||
| - | % of all service reservoirs with coliforms detected | 0.00% |
0.00% |
0.00% |
| FAECAL COLIFORMS | ||||
| Total number of tests | 52 |
52 |
52 |
|
| - | number containing faecal coliforms | 0 |
1 |
0 |
| - | % containing faecal coliforms | 0.00% |
1.92% |
0.00% |
| Service reservoirs with faecal coliforms detected | 0 |
1 |
0 |
|
| - | % of all service reservoirs with faecal coliforms detected | 0.00% |
100.00% |
0.00% |
There were no failures of the coliform standard at the Company's service reservoir.
Water Quality in Water Supply Zones
The table below shows the data for the key parameters and any other parameters where there was a failure of the standard. All other parameters were fully compliant.
| Parameter | Total number of tests |
Tests not meeting the prescribed concentration or value |
Number of failures covered by Undertakings |
Number of zones not complying with the standards |
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No |
% |
2002 |
2001 |
2000 |
||||
| Coliforms | 13 |
0 |
0.00 |
0 |
0 |
0 |
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| Faecal coliforms | 13 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Colour | 4 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Turbidity | 13 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Odour | 1 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Taste | 1 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Hydrogen ion | 13 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Nitrate | 13 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Nitrite | 13 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Aluminium | 4 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Iron | 8 |
1 |
12.50 |
0 |
1 |
0 |
0 |
|
| Manganese | 4 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Lead | 1 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| PAH | 2 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Trihalomethanes | 1 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Total pesticides | 13 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| Other pesticides | 68 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| All others | 156 |
0 |
0.00 |
0 |
0 |
0 |
0 |
|
| TOTAL | 341 |
1 |
0.29% |
0 |
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| 1 zones in 2000, 2001 and 2002 | ||||||||
The New Regulations
In 2002, the Company carried out monitoring for the six new parametric values set down in the new Water Supply (Water Quality) Regulations 2000. These Regulations come into force on 25 December 2003. The results are shown in the table below.
| Parameter | Total number of tests |
New standard |
Tests not meeting the new standard |
| Benzene | 4 |
1.0 µg/l |
0 |
| Bromate | 4 |
10.0 µg/l |
0 |
| 1,2 dichloroethane | 4 |
3.0 µg/l |
0 |
| Nitrite (ex-water treatment works) | 13 |
0.1 mg/l |
0 |
| Clostridium perfringens | 4 |
0/100 ml |
0 |
| Enterococci | 2 |
0/100 ml |
0 |
Compliance data for 2002 has also been analysed against the revised standards and the results are shown in the following table.
| Parameter | Total number or tests |
Current Standard |
Number of tests not meeting current standard |
Revised Standard |
Number of tests not meeting revised standard |
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| Antimony | 1 |
10.0 µg/l |
0 |
5.0 µg/l |
0 |
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| Arsenic | 1 |
50.0 µg/l |
0 |
10.0 µg/l |
0 |
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| Boron | 1 |
2.0 mg/l |
0 |
1.0 mg/l |
0 |
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| Copper | 1 |
3.0 mg/l |
0 |
2.0 mg/l |
0 |
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| Lead | 1 |
50.0 µg/l |
0 |
25.0 µg/l1 |
0 |
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10.0 µg/l2 |
0 |
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| Nickel | 1 |
50.0 µg/l |
0 |
20.0 µg/l |
0 |
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| Nitrite (at consumers' taps) | 13 |
0.1 mg/l |
0 |
0.5 mg/l |
0 |
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| PAH | 2 |
0.2 µg/l |
0 |
0.1 µg/l |
0 |
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| Tetrachloroethene | 1 |
30.0 µg/l |
|
10.0 µg/l
|
0
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| Trichloroethene | 1 |
10.0 µg/l |
Details of the new and revised standards, and the reasons for the revisions where applicable, can be found in chapter J "New Regulations and Associated Programmes of Work".
1 from 25.12.03
2 from 25.12.13
Company Audit and Inspection
The Company was inspected or audited by the Inspectorate on a number of occasions during 2002. Where relevant, report summaries are available in the 'Business and Technical' section of the Inspectorate's web site under 'Audit and Inspection'.
| Audit or Inspection | Date |
| Inspection of one water treatment works | July 2002 |
| Audit trails of three test results | October 2002 |
A number of recommendations were made in respect of action required to avoid the risk of a breach of a regulatory duty. These recommendations were in relation to the audit trails and required action by the Company's contract laboratory.
Incidents
No events were notified during 2002 by the Company. For further details on the classification of incidents, see chapter C "Events affecting Water Quality" in Part 3.
Enforcement Action
No enforcement action was considered for the Company as a result of the Inspectorate activities during 2002.
Improvement Programmes
No improvement programmes were due for completion during 2002.
