Bath faster, or unhealthy, because tap water easily from the skin to absorb volatile organic compounds, carcinogenic rate increases. Institute of Environmental Medicine, China Medical College Professor Hsien-Wen Kuo Daiyanjiusheng Jiang Zongfen study found that Taiwan's northern, central and southern metropolitan areas in the three to the worst water quality in Kaohsiung, the most serious, the best Taichung City Government to improve water quality at the same time, the public bath action should be accelerated in order to wash the more the more healthy.

Taiwan, with water pollution, poor water quality, water treatment plant raw water had even chlorination; Hsien-Wen Kuo pointed out that a lot of raw water sources, such as pig waste water, wastewater plants, water, a lot of organic matter, chlorination may lead to many derivatives objects, such as total trihalomethanes, benzene, carbon tetrachloride, vinyl chloride, trichlorethylene, etc., the highest rate of total trihalomethanes accounted as 75% of which the most carcinogenic chloroform, reaching more than 80%.

Kaohsiung water quality in the three metropolitan areas, the water in the concentration of total trihalomethanes highest, at $ 14.9 PPb (ppm), Taipei, second place 9.9 PPb, Taichung lowest sixty-five PPb. Hsien-Wen Kuo pointed out, whether in the pipeline by the end of the water, the reservoir of material, cleaning frequency, and amount of organic matter is closely related to the amount of calm; because these organic substances and the combination of free chlorine in water will cause cancer.

Hsien-Wen Kuo pointed out that the person is the biggest water bath, study, particularly in the residual chloroform in tap water exposure study found that taking a bath to ten minutes calculation, 40% of the total body of chloroform inhalation, 30% is absorbed through the skin, 30% was to drink in, but bath time increased for the twenty minutes, inhaled into Liu Cheng, skin absorption of 30% for entry into the drink, showing a bath in a confined space, breathing and skin by inhalation of a startling amount. Hsien-Wen Kuo pointed out that the length of time bathing, chloroform exposure to carcinogenic conversion rate, ten minutes is still set up in Kaohsiung, one of 12 people per million.