Mercer Island officials say the city has clawed back roughly 88% of the $420,350.94 that was siphoned off in an accounts-payable scam, leaving taxpayers responsible for a $50,000 insurance deductible. Detectives traced funds across state lines, seized money from bank accounts and worked with the city’s insurer to recover a total of $370,350.94, all while staff began tightening vendor controls behind the scenes.
How the scam unfolded
In January 2025, someone impersonating a legitimate contractor contacted city staff and asked to change the contractor’s mailing address. The Finance Department processed the request and a $420,350.94 progress payment was then mailed to the fraudulent address, according to KOMO News. The scheme came to light when the real contractor reported not receiving that progress payment on Feb. 24, 2025, which triggered the city’s investigation.
City kept the case quiet while detectives worked
In a notice to the community, the City of Mercer Island says it held off on public disclosure so detectives would not compromise the investigation while they followed leads and collected bank records. City officials say investigators coordinated with financial institutions and the King County Prosecuting Attorney’s Office to serve warrants and trace funds across multiple banks. The notice credits that low-profile approach with helping officers identify a suspect and recover a substantial portion of the money.
What investigators seized
Detectives seized $216,405.77 in April 2025 and another $98,593.18 in August 2025, for a total of $314,998.95 in recovered funds, and the city’s insurer reimbursed an additional $55,351.99, according to KOMO News. Together, the seizures and insurance payout brought the city’s total recoupment to $370,350.94, leaving a $50,000 net loss equal to the policy deductible. KOMO also reports the FBI declined to take the case because the dollar loss fell below the agency’s usual threshold.
What the city is changing
The city brought in outside consultants to audit accounts-payable policies, implemented a formal secondary-review requirement for any vendor data changes, tightened digital workflows after a software transition and expanded staff training on spotting email and payment fraud, the City of Mercer Island says in its community notice. Officials also say they carried out a validation review of vendor changes from the previous six months to check for other irregularities. According to the notice, there was no evidence that city employees or the contractor were complicit in the scheme.
What’s next legally
Detectives say they have identified a suspect in another state and will assist the King County Prosecuting Attorney’s Office with any filings and potential extradition, and the investigation remains active. Local police have also warned residents about impersonation and vendor-change scams, and the Mercer Island Reporter recently highlighted the department’s scam-alert advisory for islanders and businesses. City leaders say the episode is a blunt reminder of how quickly payment systems can be exploited and why stronger vendor controls matter.
