A Pristine Water Source
San Juan Water District is committed to ensuring a reliable, high-quality water supply for all our customers. San Juan water comes from among the most pristine watersheds in the United States — the American River watershed — and ranks among the highest quality water available in California.
The American River originates in the Sierra Nevada and has three forks that all combine at Folsom Lake, the watershed’s largest reservoir. The north fork begins at Soda Springs and accounts for 20 percent of the river’s flow; the south fork starts near Echo Summit and accounts for 40 percent; and the middle fork, which begins in the mountains west of Squaw Valley, transitions into the North Fork at the Hwy 49 bridge, contributing 40 percent of the river.
Snowfall accounts for about 40 percent of the watershed’s water supply, with the remaining coming from precipitation, which varies annually from 25 to 80 inches.
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