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New Water Mains Chlorination

New Water Mains Chlorination

To safeguard the quality of water and public health, there is a mandatory requirement that private water supply pipes be chlorinated and tested before they are connected to mains water.

Irish Water will not allow the connection of new mains piping onto their infrastructure until the new pipework has been chlorinated effectively, and a chlorination certificate alongside microbial analysis has been provided.

Chlorination and de-chlorination are carried out following a successful hydrostatic pressure test. All of this process ensures and demonstrates that the pipework is hygienic and free from harmful pathogens such as E Coli, Coliform Bacteria, Enterococci and Clostridium Perfringens.

Celtic Water Solutions performs water mains chlorination and disinfection working for a range of clients which includes local authorities, consulting engineers, building contractors, and utility companies.

All of our work is completed in accordance with strict requirements of the Irish Water’s Code of Practice for Water Infrastructure(Connections and Developer Services).

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Chlorination & Swabbing Process

The chlorination process starts with pre-flushing and swabbing of the systems with potable water to remove any debris which may have entered the pipe during construction.

Foam swabs, soaked in chlorine, are passed through the main for final cleansing a sufficient number of times to achieve clear wash water and providing a clean base for the chlorination to take place.

Following the pre-flushing, the pipework is disinfected using a high-level chlorine solution (min 50mg/L) which remains in contact with the pipework for 20-24 hours.

After the contact time has ended, chlorine levels are checked and if found to meet the minimum requirements the pipework is flushed with potable water. The chlorinated water is then neutralized and disposed of in an environmentally responsible manner. Flushing is continued until all residual chlorine is removed and the concentration of chlorine is similar to the mains water supply.

To confirm the efficacy of the disinfection process, water samples are then taken and sent to an INAB Accredited laboratory for chemical and microbiological analysis.

The water mains are then left in a sealed state to ensure the sterile condition.

Following receipt of the analysis from the laboratory, a Certificate of Chlorination is issued which must be submitted to Irish Water to enable a connection. Once all tests have been complete and the water is of a satisfactory level, the piping system can then be commissioned for use.

We Test for

  • Escherichia coli (E. Coli)
  • Coliforms
  • Clostridium Perfringens
  • Enterococci
  • Total Residual Chlorine
  • Free Residual Chlorine

Why Choose Celtic Water Solutions?

Celtic Water Solutions is Ireland’s leading water treatment company offering expert water management solutions. We are a nationwide company with over 10 engineers located throughout the Republic of Ireland.

Over the years, we have partnered with contractors and local authorities across Ireland building long term relationships on trust and quality of service.

Our expert team can manage every aspect of pressure testing, chlorination and sampling to confirm that your new water infrastructure is fully compliant with water regulations.

We have designed our disinfection services to meet the standards of BS 8558:2015 and the local water authority specifications to ensure we maintain a high standard of service when on your site.

We do not use subcontractors and our get it right the first-time attitude ensures that customers obtain a quick and hassle-free connection.

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To learn more about our mains water chlorination services, please speak to our team.

Call 093 60705

For more information:

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Unit 51, N17 Retail Park,
Galway Road, Tuam
Co. Galway
Phones & Fax:
Head Office Tuam Co.Galway: 093 60705
Dublin: 01 5253171
Cork: 021 2427393
Meath: 046 9570012
Donegal: 074 9706007
Tipperary: 062 30711

+353 093 27094
Opening Hours:
Monday to Friday: 9am – 5pm
Saturday and Sunday: Closed
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