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Chlorine: Health Hazards

Asked by Gregory StaffordConservativeDepartment for Environment, Food and Rural AffairsTabled Answered 8 July 2026UIN 14685

The question

To ask the Secretary of State for Environment, Food and Rural Affairs, whether water companies are required to retain records of chlorine residual measurements taken at individual domestic properties.

Answered by Emma Hardy

Water companies are required to monitor for chlorine as set out in Schedule 3 of The Water Supply (Water Quality) Regulations 2016. Chlorine residual measurements are part of companies’ routine compliance sampling programmes and are recorded and submitted to the DWI on each occasion. Chlorine site tests are routinely recorded on investigatory samples that require laboratory analysis.

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