Sonoma County Drought: 0% affected
Reservoirs: Lake Sonoma 100.5% Lake Mendocino 96.2% Lake Pillsbury 87.6% [source]
Most of Sonoma County is in the watershed [def] of the Russian River and its tributary streams. The Russian River is a managed river system; Sonoma Water stores winter rain behind dams in three upstream reservoirs and releases it during the summer to keep flows up in the Russian River.
Water for People: Urban areas get their water from pumps in the Russian River near Forestville (surface water) and wells that tap into groundwater; rural residents and agriculture mostly use wells.

