Treasurer David Griffiths' office noticed Monday that three unauthorized transaction files had been logged the previous Friday, April 19.
The Wenatchee World reports that the files moved more than $1 million out of a public hospital district account to 96 different bank accounts, most in the Midwest and East.
Griffiths says his office has been able to retrieve about $133,000 by notifying recipient banks. He says it may take a month to learn how much money can be recovered.
The account was a type used for direct-deposit payroll and bill payment. By law, the treasurer administers such assets for 55 county taxing districts, including Leavenworth's Chelan County Public Hospital District No. 1, which operates Cascade Medical Center.
The Chelan County sheriff's office is investigating locally and Griffiths is cooperating with interstate fraud investigators.