A Bangor man has pleaded guilty to federal charges related to a large marijuana-growing operation in the Waldo County town of Frankfort.

Nicholas Reynolds, 33, pleaded guilty Monday in U.S. District Court in Bangor to conspiring to manufacture, distribute and possess with intent to distribute marijuana, according to a statement issued by U.S. Attorney Halsey B. Frank.

Court records state that between October 2010 and August 2016 Reynolds conspired with others to illegally manufacture and distribute marijuana.

Frank said Reynolds grew marijuana at a “large, sophisticated indoor growing facility in Frankfort, Maine, which he was told was an illegal medical marijuana grow.”

Frank said that federal drug enforcement agents executed a search warrant at the site on May 12, 2016, and seized about 400 marijuana plants, 295 marijuana root balls and paraphernalia used to grow and process marijuana.

According to the search warrant affidavit, Reynolds and his conspirators were not registered as medical marijuana caregivers with the Maine Department of Health and Human Services. The location of the pot-growing facility was also not reported to DHHS.

Reynolds, who will be sentenced at a later date, faces up to 20 years in prison, three years to lifetime supervised release, and a fine up to $1 million.