Is chlorination a legal requirement in South London?

Yes, in specific circumstances. BS 8558 requires chlorination for new installations, systems that have been substantially modified, and systems found to be contaminated. ACOP L8 also requires disinfection as part of remedial action when legionella or other contamination is detected in your South London property.

Who is responsible for arranging chlorination in South London?

The building owner, landlord, or duty holder with operational control of the water system is responsible. For new-build projects in South London, the contractor commissioning the system must ensure it is chlorinated before handover.

How long does chlorination take?

A typical chlorination in South London takes 4–8 hours including contact time, flushing, and sampling. Larger or more complex systems may require overnight treatment. We aim to minimise disruption and restore your water supply as quickly as safely possible.

What happens if chlorination reveals a problem?

If post-treatment sampling at your South London property shows that contamination persists, we investigate the root cause — this may include further system inspection, repeat treatment, or recommendations for pipework modifications to eliminate the source.

What chlorine concentration is used during treatment?

We follow BS 8558 guidelines, typically using 50 mg/l for a minimum one-hour contact time, or 20 mg/l for two hours. The exact dosing depends on the system and the nature of the contamination. After treatment, we flush until residual chlorine falls below 0.5 mg/l.

Chlorination in South London

Q: How much does chlorination cost in South London?

Pricing depends on the system size and urgency. Routine chlorination for a small London system starts from around £300, while emergency or large-scale treatments are quoted individually. Contact us for a free estimate based on your specific requirements.

Professional chlorination for home to social housing developments, nhs facilities, and a growing number of commercial premises.

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Is Chlorination a Legal Requirement?

Chlorination is required under BS 8558 whenever a water system is newly installed, substantially altered, or found to be contaminated. ACOP L8 also requires that contaminated systems are disinfected before being returned to service. Failure to disinfect can leave you exposed to prosecution under health and safety legislation.

The duty to ensure disinfection falls on the building owner, landlord, or whoever has operational control of the water system. Contractors commissioning new systems also have a responsibility to chlorinate before handover.

South London's social housing providers, NHS facilities, and commercial operators need reliable chlorination services they can count on — both for planned maintenance and emergency response. Our South London team provides rapid chlorination across all boroughs.

We work with major housing associations and local authorities across South London, delivering consistent chlorination services at scale. Our planned maintenance programmes ensure regular disinfection is completed on schedule, reducing the risk of contamination events.

What's Included

System Assessment

Initial assessment of the water system layout and contamination level before treatment.

Controlled Chlorine Dosing

Precise dosing of chlorine to the correct concentration per BS 8558 guidelines.

Contact Time Management

Monitored contact period to ensure effective disinfection throughout the system.

Full System Flush

Complete flushing and neutralisation to remove residual chlorine after treatment.

Post-Treatment Sampling

Water samples taken after chlorination to confirm the system is safe for use.

Disinfection Certificate

Written certificate confirming the chlorination was carried out to required standards.

Our Process

Get a Quote

Call us or fill in our form — for emergencies we aim to respond within 1 hour.

Site Visit Booked

We confirm a date and time, or for emergencies, attend the same day where possible.

System Isolation

We safely isolate the affected sections of your water system before treatment.

Chlorination Treatment

Controlled dosing and monitored contact time to disinfect the entire system.

Flush & Sample

Full system flush followed by water sampling to confirm safe chlorine levels.

Certificate Issued

Disinfection certificate issued and your water supply cleared for normal use.

How Much Does Chlorination Cost in South London?

Pricing depends on the system size, urgency, and complexity. Routine chlorination for a small system starts from around £300, while emergency or large-scale treatments are quoted individually. We'll provide a fixed-price quote within 1 working day — no obligation.

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Common Issues in South London

•Large-scale chlorination of communal systems in housing estates
•Emergency response for contamination in healthcare water systems
•Post-construction chlorination in new-build developments
•Recurring contamination in ageing social housing infrastructure

Chlorination by Borough

Croydon Greenwich Lambeth Lewisham Southwark Wandsworth

Frequently Asked Questions

Chlorination in other areas:

Central London East London North London West London

Other services in South London:

Legionella Risk Assessment Legionella Testing Water Tank Cleaning

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