Victims are no longer reporting some crimes to police because so many offenders are never brought to justice.
A new report said the public are losing faith in the criminal justice system and have «rumbled» that police do not have the capacity to investigate.
The constabulary inspector said a suspect was charged in just 7.8% of crimes in England and Wales in the year to March 2019. The Home Office said action should be taken if forces are not performing.
It came as a report by the spending watchdog warned the government could run out of prison places in two years because of tougher sentencing measures, combined with a drive to recruit 20,000 police officers.
The National Audit Office (NAO) said ministers have failed to deliver a promised 10,000 new prisoner places. But the Ministry of Justice said it would «always have enough prison places».