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| Policies
and measures |
Background : Japan |
Drinking water supply is one of the most important uses of public
water. Protection of headwaters has played an extremely important
role for the protection of the quality of drinking water supplies.
However, hazardous substances such as trihalomethane, a suspected
carcinogen, which is produced in the chlorination purifying process
for drinking water, have created problems. Therefore, improvement
of purification methods and a wide range of water quality protection
measures for public waters are required. This includes reduction
of seemingly harmless organic substances like humic acids. Humic
acids in ambient water contributes to the formation of trihalomethane.
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