Chlorinating Mains Water

Under the Water Supply (water fittings) Regulations 1999, you will be required to disinfect your pipe work prior to connection. The disinfection must be carried out to ‘BS 8558’. This is to ensure there is no detriment to public health. New supplies should be swabbed, flushed, filled with chlorinated water not less than 50mg/l and allowed to stand for 1 hour, following which the chlorinated water should be flushed out, the pipe refilled, and a sample taken. The pipework must be disinfected with a ‘hypochlorite’ solution.

Prowater can carry out this work to the highest standards within the industry and issue you with the necessary disinfection certificate. The ‘certificate’ will give the following information.

• Confirmation the work has been carried out to BS 8558
• Confirmation that the pipe has been swabbed and flushed prior to disinfection (where possible)
• The chlorine level of the source water
• The chlorine level after dosing
• The contact time
• The chlorine level after contact
• The chlorine level after flushing
• The diameter and length of pipe disinfected
• The source of the water used
• The sample location point
• Where possible diagrams will be made

Samples should be taken after the chlorination has been carried out.

As a minimum, ‘sample results’ must include Ecoli total coliforms and plate counts taken at both 22°C and 37°C to be certified by a UKAS accredited laboratory.