The Greenville News reported that all seven people no longer work the Mauldin Police Department.
Former Sgt. Adam Lawrence says he can't talk about his departure. The other six couldn't be reached for comment.
The State Law Enforcement Division has been asked to investigate.
An anonymous letter addressed the Mauldin Police Department and obtained by the newspaper lays out accusations that up to three officers were having sexual relationships with a city dispatcher.
Officials said Monday that they began investigating after receiving the anonymous letter at the end of January. A current dispatcher also complained in March.
One of two officers who investigated, Capt. Roger Tripp, retired immediately on Wednesday.
Information from: The Greenville News, http://www.greenvillenews.com
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