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Number of Samples(1)
Class of Supply
Samples are to be taken each year except in the case of class E supplies (see note 5). If more than one sample is required, the samples must be taken on separate occasions.
The basic parameters are listed in column (1) of Part II of this Schedule.
The additional parameters are listed in column (2) of Part II of this Schedule. The local authority must sample for any additional parameters which they consider should be taken because of the characteristics of the locality or of the supply’s distribution system.
The coliform parameters are total coliforms and faecal coliforms. Sampling for coliform parameters is additional to the coliform sampling carried out as part of sampling for basic parameters and must be carried out on separate occasions.
Class E supplies are to be sampled once for basic and additional parameters before 31st December 1994 unless–
they have been sampled for those parameters during 1990 or 1991; and
the local authority have reasonable grounds for believing that no change has occurred or is likely to occur which may cause the quality of the supply to deteriorate.
From 1st January 1995 all class E supplies are to be sampled once every 5 years.
The sampling frequency should be halved if the premises served by the supply are used for not more than six months in the year.
In 1992, or in the first year in which the supply is used as a class 3 supply, 2 samples must be taken in the first two months of the year and 3 in the remainder of that year.
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