But the Los Angeles District Attorney said on Tuesday more evidence needs to be gathered before they can consider criminal charges.
Manson, 53, is facing allegations of sexual assault and domestic violence dating from 2009 to 2011.
The District Attorney’s office described the case they received from LA County Sheriff’s Department detectives this week as “partial”.
"Once we receive everything, experienced prosecutors will carefully and deliberatively review everything that has been submitted prior to making a filing decision," the office said in a statement on Tuesday.
"This review will take some time but rest assured our office takes these allegations very seriously."
Representatives for Manson - whose legal name is Brian Hugh Warner - did not immediately respond to a request for comment, but his attorney has called the allegations "provably false."
The investigation included a November search of the rocker’s home in West Hollywood, where media devices and other items were seized.
Authorities have not identified the women involved, but several have publicly alleged that they were physically, sexually and emotionally abused by Manson around the time of the incidents under investigation, and some have filed civil lawsuits.
They include Game of Thrones actor Esme Bianco, whose lawyer said she also gave interviews to law enforcement.
Manson is himself suing his former fiancee, Westworld actor Evan Rachel Wood, whose Instagram post in February 2011 alleging Manson had "horrifically abused me for years" set off the wave of public allegations against him.
The suit calls Wood’s assault allegations fabricated, and said she and another woman used false pretenses including a phony letter from the FBI to convince other women to come forward.
Wood's lawyers said in court documents that the suit is meritless, and an example of the retaliation Manson long threatened Wood with if she spoke out about his abuse.
Manson emerged as a musical star in the mid-1990s, known as much for courting public controversy as for hit songs like The Beautiful People and hit albums including Antichrist Superstar and Mechanical Animals.