The County should have a CPA firm that annually audits the County and its major federal programs. Sometimes they put their audit report on the County website. You could notify them.
Just checked the County website. It appears the audit is performed by the Washington State auditor - Brian Sonntag. All County financial records is public information, btw.
Since everything in government is supposed to be a public record, anyone can audit the books. but if you believe there are improprieties, contact your State Auditor with your concerns. it is the charge of the State Auditor to go through the books of ALL commissions, councils, county because they receive public funds.
I’ve been trying to work on a similar issue that deals with medicaid money. I need to find out what reports the state needs to provide to the federal government. Trying to contact medicare folks directly was a cluster**** trying to get someone on the telephone.
Get the grant agreement, which the County Council must approve and is in their minutes and records, and then complain to the federal agency, with specific references to the grant agreement terms and the federal rules that have been violated. Copy the federal agency's inspector general with the information as well.
Your fist concrete step is to use the County Council's website search function in the upper right of this web page. Enter the search terms "grant agreement" and the name of the program you are concerned about. You can research Code of Federal Regulations citations referred to in the grant agreement here.
Good hunting.