Hillsboro's drinking water comes from the Cline River. The watershed begins on the slopes of Mount Eagle and flows nearly eighty-five miles from the river's headwaters. Naturally occurring fluoride in the Cline River is less than 0.5 ppm (parts per million), which is the detection limit for analyzing fluoride. The water is made safe to drink through conventional treatment methods and consistent monitoring.
What is the text's main purpose?
to demonstrate the importance of protecting the Cline River watershed
to inform residents that fluoride is safe to drink
to encourage residents to drink more water
to inform residents about the source and content of Hillsboro's drinking water