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海门为肝癌高发区之一。肝癌年死亡率在５０／１０万以上。１９７２年、１９９２年二次大规模的流行病学调查提示：海门肝癌高发与饮水有关。肝癌死亡率的高低依次为：宅沟水＞泯沟水＞河水＞浅井水。测定水中有机污染指标（耗氧量、氨氮、亚硝酸盐氮）含量、污染程度与上述趋势一致。本文还报告了各类水源中微囊藻毒素含量的测定结果。
Haimen is one of the high-risk areas for liver cancer. The annual mortality rate of liver cancer is 50/100,000 or more. Two large-scale epidemiological investigations in 1972 and 1992 suggested that the high incidence of liver cancer in Haimen was related to drinking water. The order of mortality of liver cancer was: home ditch water> ditch water> river water> shallow well water. The determination of organic pollution indicators (amounts of oxygen consumption, ammonia nitrogen, and nitrite nitrogen) in water and pollution levels are consistent with the above trends. This article also reported the results of the determination of microcystins in various water sources.