Standards of Ethical Conduct for Employees of the Executive Branch section 5 C.F.R. § 2635.101(b)(12) makes employee private debt a matter of government concern:
(12) Employees shall satisfy in good faith their obligations as citizens, including all just financial obligations, especially those—such as Federal, State, or local taxes—that are imposed by law.
Failure to pay a court-ordered obligation can be a basis for disciplinary action: OGE advisory opinion 94×9: Executive Branch Employee’s Obligation to Satisfy Just Debts.
A USA.gov post on credit counselor resources might be useful for managers or DAEOs counseling an employee with debt issues.