5 CHOLDERTON AND DISTRICT WATER COMPANY
Introduction
Cholderton and District Water Company supplies on average about 0.6 Ml/d of water to about 2,100 consumers in the villages of Cholderton and Shipton Bellinger in Wiltshire. The Company’s water supplies come from two deep chalk borehole sources one duty and one standby, the standby borehole was not used during 2000. The Company has one treatment works, and distributes water through 44 km of pipes and two service reservoirs, one of which is considered part of the treatment works and supplies one water supply zone.
Overall water quality
At the water treatment works, the service reservoir and in the water supply zone, the Company carried out a total of 521 determinations in 2000, all of which demonstrated compliance with the relevant PCV.
Microbiological quality of water leaving treatment works
The Company complied with the sampling frequencies required by regulation 17 at its treatment works in 2000.
Table 5.1 shows the Company's performance in 2000, with data for 1999 and 1998 for comparison.
There were no contraventions of the microbiological standards at the Company's water treatment works in 2000.
Microbiological quality of water in service reservoirs
The Company complied with the sampling frequencies required by regulation 18 at its service reservoir in 2000.
Table 5.2 shows the Company's performance in 2000, with data for 1999 and 1998 for comparison.
There were no contraventions of the microbiological standards at the Company's service reservoir in 2000.
Water quality in water supply zones
The Company complied with the required sampling frequencies for all parameters in the zone.
Table 5.3 shows the Company's performance in 2000, with data for 1999 and 1998 for comparison. There were no contraventions of the standards within the Company's supply zone.
Inspection
Audit trail of one sample
In November 2000, Mr R M Walls, Consultant, working under the direction of Mr W M Waite, Principal Inspector carried out audit trails on one sample chosen at random. Based on Mr Walls report Mr Waite concluded that:
that the sampling and analytical arrangements were satisfactory and the result was put on the public record within the prescribed period.
Mr Walls did not make any recommendations or suggestions for the Company to consider.
Improvement programmes
The Company currently has no undertakings in respect of improvement programmes.
Incidents
No events regarded as constituting incidents in which drinking water quality demonstrably deteriorated came to the attention of the Inspectorate in 2000.
Enforcement action
No enforcement action needed to be considered for the Company as a result of the Inspectorate's work in, or pertaining to, the calendar year 1999.
table 5.1Cholderton and District Water Company
MICROBIOLOGICAL QUALITY OF WATER LEAVING TREATMENT WORKS2000 1999 1998 Number of water treatment works 1 1 1 Works with no sampling shortfall 1 1 1 COLIFORMS Total number of determinations 52 53 53 - number containing coliforms 0 0 0 - % containing coliforms 0.0 0.0 0.0 Treatment works with coliforms detected 0 0 0 - % of all works 0.0 0.0 0.0 FAECAL COLIFORMS Total number of determinations 52 53 53 - number containing faecal coliforms 0 0 0 - % containing faecal coliforms 0.0 0.0 0.0 Treatment works with faecal coliforms detected 0 0 0 - % of all works 0.0 0.0 0.0
table 5.2 Cholderton and District Water Company
MICROBIOLOGICAL QUALITY OF WATER IN SERVICE RESERVOIRS2000 1999 1998 Number of service reservoirs 1 1 1 Service reservoirs with no sampling shortfall 1 1 1 COLIFORMS Total number of determinations 52 53 53 - number containing coliforms 0 0 0 - % containing coliforms 0.0 0.0 0.0 Service reservoirs with coliforms detected 0 0 0 Service reservoirs with coliforms detected in more than 5% of samples 0 0 0 - % of all service reservoirs 0.0 0.0 0.0 FAECAL COLIFORMS Total number of determinations 52 53 53 - number containing faecal coliforms 0 0 0 - % containing faecal coliforms 0.0 0.0 0.0 Service reservoirs with faecal coliforms detected 0 0 0 - % of all service reservoirs 0.0 0.0 0.0
table 5.3 Cholderton and District Water Company
WATER QUALITY IN SUPPLY ZONESColumns 'CBU' show, for determinations, contraventions covered by undertakings and, for zones, the total number of zones covered by undertakings in 2000. Column 'E' shows the number of zones for which new enforcement action is under consideration as a result of contraventions of the PCV in 2000. Please refer to the Introduction to Part 2 for more detailed explanation of this table. PARAMETER DETERMINATIONS in 2000 ZONES (1 in 2000)* Total Contravening PCV Non-compliant No. % CBU CBU E Number in: 2000 2000 1999 1998 Coliforms 13 0 0.0 0 0 0 0 0 0 Faecal coliforms 13 0 0.0 0 0 0 0 0 0 Colour 4 0 0.0 0 0 0 0 0 0 Turbidity 13 0 0.0 0 0 0 0 0 0 Odour 1 0 0.0 0 0 0 0 0 0 Taste 1 0 0.0 0 0 0 0 0 0 Hydrogen ion 13 0 0.0 0 0 0 0 0 0 Nitrate 13 0 0.0 0 0 0 0 0 0 Nitrite 13 0 0.0 0 0 0 0 0 0 Aluminium 4 0 0.0 0 0 0 0 0 0 Iron 4 0 0.0 0 0 0 0 0 0 Manganese 4 0 0.0 0 0 0 0 0 0 Lead 1 0 0.0 0 0 0 0 0 0 PAH 2 0 0.0 0 0 0 0 0 0 Trihalomethanes 1 0 0.0 0 0 0 0 0 0 Total pesticides 13 0 0.0 0 0 0 0 0 0 Other pesticides 76 0 0.0 0 0 0 0 0 0 All others 124 0 0.0 0 0 0 0 0 0 TOTAL 313 0 0.0 0 - - - - - *1 zone in 1999; 1 zone 1998
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Published 11 July 2001
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