Monthly lahar siren test set for noon Residents are reminded this is only a test and they should not call 911. October 1, 2012 1:05 pm Tags: Bonney Lake-Sumner Courier-Herald Pierce County will be testing lahar sirens beginning at noon today. The county conducts such a test on the first Monday of each month. Residents are reminded this is only a test and they should not call 911. For more information, cal 1-866-977-2362. Tags: Bonney Lake-Sumner Courier-Herald