Police have said the abandoned jet skis were found on the Mississippi side of the river and that a witness reported seeing one man and two women riding them.
Investigators later determined that Hartman’s mother had ties to West Virginia.
Making the arrests on Tuesday were US marshals and officers with the West Virginia State Police, the Lewisburg Police Department and the Greenbrier County Sheriff’s Office.
Arrested along with Hartman were his wife, 39-year-old Misty Hartman, his mother, Linda Annette White, 61, and Rodney Trent, 52, identified by the Marshals Service as White’s boyfriend.
Trent faces felony charges of harbouring a sex offender and of assisting Hartman and the two women, the Marshals Service said.
The service did not say what charges Misty Hartman and White would face. An Arkansas Department of Corrections spokeswoman said she expected the suspects to be extradited to Arkansas as soon as possible.
Hartman, 39, was sentenced to life in prison in 2013 for a rape conviction out of Franklin County, Arkansas.