Veronica Knecht, 63 and Eric Knecht, 33, both of Andover Road in Falls Township, were arrested on Wednesday.
Detectives say they were under investigation throughout September.
According to authorities, the Knechts sold or possessed about 1,600 bags of heroin and sold them for about $100 each.
Police say Veronica Knecht was caught with heroin in the trunk of her car. She was released on $75,000 unsecured bail.
Eric Knecht was already in prison, having been arrested on September 30th stemming from the same investigation.