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Published 11:46 4 Feb 2017 GMT
Updated 13:49 19 Apr 2021 BST

"Trihalomethanes are formed when there is either inadequate pre- treatment of the water and/or poor control over the disinfection process itself."
"Acute effects of THMs in drinking water are rare. Two main long-term health outcomes are studied with regard to THMs and drinking water: cancer and reproductive outcomes. "Both chloroform and Bromodichloromethane, two individual THMS, were classified as possibly carcinogenic to humans (Group 2B). This category is used for agents for which there is inadequate evidence of carcinogenicity in humans and sufficient evidence of carcinogenicity in experimental animals."
"It is emphasised that adequate disinfection should never be compromised in attempting to meet guidelines for THMs ... it is recommended that THM levels in drinking-water be kept as low as practicable."
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