本文介绍了魁北克省小型公用事业中三卤甲烷出现的区域概况，其中地表原水的处理包括直接氯化。此外，它还建议对这些公用事业进行必要的处理，以符合提议的和更严格的三卤甲烷法规。

This paper presents a regional portrait of the occurrence of trihalomethanes in small utilities of Quebec where treatment of surface raw waters consists of direct chlorination. Also, it recommends the treatment which would be required in order for these utilities to comply with proposed and more stringent THM regulations.