He had been drinking on those occasions, the woman told police.
She told police the last time he came to her house and had sex with her was Jan. 31, the day she made her complaint.
Attempts to reach McCall were unsuccessful Tuesday. Directory assistance said it had no telephone listing under his name.
According to a spokesman in the Allegany County State's Attorney's office, the woman had been developed as an informant for the Washington County Narcotics Task Force, working here since November.
When the allegations surfaced, McCall - a three-year veteran with the Washington County Sheriff's Department - was immediately suspended with pay, according to Washington County Sheriff Charles Mades.
Mades and Sgt. Randy Wilkinson assisted Allegany County authorities in the investigation of the allegations that led to the charge.
A trial date of March 18 has been set in Allegany County District Court. The possible maximum penalty for a misdemeanor charge of misconduct in office wasn't known Tuesday.
Mades said a personnel review of McCall's employment will be conducted following that hearing.
Narcotics task force Director Charles Summers said Tuesday that McCall's position on the task force was filled after the Jan. 31 suspension.
"I feel bad for Todd and his family in this matter, which is going to cause them embarrassment," Summers said.
Staff Writer Steven T. Dennis contributed to this story.