1991年7月18日，美国环境保护局（USEPA）提议对饮用水中的氡进行监管。在就拟议规则提交的600多套评论中，大多数集中在氡上。关于氡的MCL提案，意见分歧很大。许多评论人士认为，美国环保局对饮用水中氡的健康风险估计被夸大了。美国环保局辩称，饮用水中的氡对健康的危害很大，而其他政府机构则质疑是否需要对饮用水中的氡进行监管。这篇论文回答了一个问题——饮用水中的氡对健康有风险吗

The U.S. Environmental Protection Agency (USEPA) proposed regulations for radon in drinking water on July 18, 1991. Of the more than 600 sets of comments submitted on the proposed rule, most focused on radon. Opinions over the proposed MCL for radon are sharply divided. Many of the commentors argue that USEPA's health risk estimate for radon in drinking water is overstated. USEPA contends that the health risk from radon in drinking water is significant, while other government agencies have questioned the need for regulating radon in drinking water at all. This paper answers the question, -is there a health risk from radon in drinking water