US study reawakens cancer fears over chlorinated drinking water

A new statistical study has found a link between the consumption of chlorination by-products in drinking water and rectal and bladder cancers.1 The study will force a re-examination of the international consensus established two years ago, which found that there was inadequate evidence to classify chlorinated drinking water as carcinogenic.

Using a statistical technique called meta-analysis, the researchers re-examined all US studies of cancer and drinking water that passed quality criteria. The data was scored for its quality and pooled to maximise the statistical power of the analysis.

The scientists found that consumption of chlorinated drinking water was associated with a statistically significant increased risk of bladder and rectal cancer. The risk of bladder cancer wa

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