LAKE BERRYESSA (CBS SF) — The Napa County Sheriff’s Office is warning residents of Lake Berryessa of a malfunction in the 911 system.

Residents with a phone prefix of 966 will be unable to reach 911 until further notice. Affected residents are advised to call (707) 253-0911 to report emergencies.

READ MORE: VIDEO: Smash-And-Grab Robbery At Tanforan Mall Jewelry Store

Further information about the nature of the malfunction was not immediately available.

READ MORE: CA Drought: Big Sur 'Colorado' Fire Could Be Start Of Year-Round Wildfire Season

Residents in the area who cannot reach 911 can dial 253-0911 to report emergencies.

MORE NEWS: Xfinity Comcast Outage In San Francisco - Bay Area

TM and © Copyright 2015 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2015 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Bay City News Service contributed to this report.