为了响应1986年《安全饮用水法案》修正案的要求，美国环境保护署正在制定、提议并采用新的饮用水法规，这些法规正在显著改变水处理实践和水公用事业运营。1990年2月，作者总结了截至1990年1月的法规的历史、内容、现状和时间表。在这篇文章中，作者介绍了1990年2月文章中涉及的法规的最新信息，并总结了截至1992年1月的新法规和预期法规。 包括70个参考文献和表格。

In response to mandates of the 1986 Safe Drinking Water Act amendments, the US Environmental Protection Agency is developing, proposing, and adopting new drinking water regulations that are significantly changing water treatment practices and water utility operations. In February 1990, the author summarized the history, content, status, and schedule of regulations as of January 1990. In this article, the author presents updated information on the regulations covered in the February 1990 article and summarizes new and anticipated regulations as of January 1992. Includes 70 references, tables.