By G. Thomas
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Extra info for Advances in Water Treatment and Environmental Management
The Water Quality Regulations require that where there is a significant risk of water failing to meet the lead standard due to lead from communication or service pipes, the water supplier must investigated how widespread the failures are in any zone. The test of a significant risk is whether more than 2% of samples taken at random from customers’ taps fail to meet the standard in any zone (DoE 1989), adopting the sampling procedure for lead described above. These requirements were more stringent than the previous interpretation and water suppliers have not generally sampled in the manner now required.
The standard for hydrogen sulphide (“undetectable organoleptically” ) is considered to be included in the taste and odour parameters. These standards apply to water samples taken from taps in the distribution system, but the same microbiological standards are prescribed for water leaving treatment works and in service reservoirs. 4 Monitoring frequencies. Water leaving treatment works must be monitored for total and faecal coliforms and disinfectant residual at frequencies depending upon the average annual output of water from the works, ranging from weekly to daily samples.
However, Section 20 of the Act allows him discretion in enforcement where a) the contraventions are trivial or b) he is satisfied that the water supplier has given, and is complying with, an undertaking to take all necessary steps to achieve compliance (a “Section 20 Undertaking”). These are the type of action programmes referred to in Article 20 of the EC Drinking Water Directive. The Secretary of State can still enforce compliance against a company despite an Undertaking, if there are grounds for doing so.
Advances in Water Treatment and Environmental Management by G. Thomas