SACRAMENTO, Calif. (AP) California Gov. Gavin Newsom on Thursday asked people and businesses in the nations most populous state to voluntarily cut how much water they use by 15% as the Western United States weathers a drought that is rapidly emptying reservoirs relied on for agriculture, drinking water and fish habitat.

The water conservation is not mandatory, but it demonstrates the growing challenges of a drought that will only worsen throughout the summer and fall and is tied to more intense wildfires and heat waves. Temperatures in parts of the region are spiking again this week but are less extreme than the record heat wave that may have caused hundreds of deaths in the Pacific Northwest and British Columbia in late June.