The District Attorney's Office is responsible for the prosecution of crimes committed in the County of Contra Costa, California.

Our Mission

The mission of the Contra Costa County District Attorney's Office is to seek justice and enhance public safety for all our residents by fairly, ethically, aggressively and efficiently prosecuting those who violate the law, and by working to prevent crime.

We hope this website will assist you by providing information about our Office and links to helpful community resources and law enforcement agencies.

News and Events

National Crime Victims' Rights Week


Click here to view National Crime Victims' Rights Week website or click on banner image

Click here to go directly to Victim Witness Assistance Program 

Click here to view 2017 Victims' Rights Week Awards ceremony 

Bay Area Unity Ride


Contra Costa County District Attorney Mark Peterson invites you to participate in the 2nd annual Bay Area Unity Ride to honor and remember law enforcement officers who have lost their lives in the line of duty in the bay area. 

Click here for flyer
Click here for registration form

Press Release 11-4-16: Oakland Police Department Sex Scandal

MARTINEZ, CA – Mark A. Peterson, District Attorney of Contra Costa County, releases statement regarding the scandal involving police officers and sheriff's deputies from throughout the Bay Area. 

Click here to read press release

District Attorney’s Office produces “Best Practices” Manual on Mandated Reporting of Child Abuse/Neglect for School District Employees

Click here to view Best Practices Manual 

Contra Costa County District Attorney, Mark A. Peterson, Joins Senator Steve Glazer to Raise Awareness of Veteran Suicides in Contra Costa County.

Click here to view video

Contra County District Attorney's Office Press Release

Quyen Tran - Grand theft by fraud and embezzlement. Click here to view press release

Richard Perez - III Investigation. Click here to view press release

FBI Announces $50,000 Reward, National Campaign to Identify East Area Rapist/Golden State Killer

The Federal Bureau of Investigation, Sacramento County Sheriff’s Department, Sacramento County District Attorney’s Office, and Contra Costa Sheriff’s Department held a press conference to announce the launch of a reward and national campaign to help identify the East Area Rapist/Golden State Killer, a violent serial burglar, rapist, and murderer who terrorized multiple communities in California throughout the 1970s and 1980s.

Click here to view flyer.

Contra Costa Times Article on Truancy Court

Click here to read more

Contra Costa County Times Article on the Courthouse Dogs program

Courthouse facility dog puts victims, witnesses at ease by Gary Peterson Bay Area News Group.

Click here to read more


Contra Costa County Awarded Grant to Test Untested Rape Kits

This week, District Attorney Mark Peterson was informed by New York County District Attorney Cyrus Vance Jr. that $1,841,535 was awarded to the Contra Costa District Attorney’s Office’s to test the estimated 2,400 untested sexual assault evidence kits, or “rape kits,” in Contra Costa County.

Click here to read more

Guest Commentary on the Signing of SB 227 by DA Mark Peterson

Contra Costa County District Attorney Mark A. Peterson authors an editorial regarding the recent signing of SB 227, which prohibits the use of grand juries to investigate and/or charge police officers who have been involved in the use of deadly force. 

Click here to read more.

Guest Commentary on the Death Penalty by DA Mark Peterson


Contra Costa County District Attorney Mark A. Peterson provide guest commentary regarding the Times editorial on the death penalty in California. 

Click here to read more.


Courthouse Dog Program

It gives me great pleasure to announce that the Contra Costa County District Attorney’s office will be receiving its first Courthouse Dog in mid-August. Mary Pickett will be going to training in Oceanside, Ca, August 3rd through August 14th. The dog’s first day in our office will be August 17, 2015.

More information will be forth coming for all staff regarding California case law in the use of the dog in court, etiquette for interaction with the dog while it is working, and more. Mary and Karen Zelis, Courthouse Dog Facilitator, are available for questions.

I want to thank Mary and Karen for the diligent work they have put in for the past years to get this program started in our office. It will benefit many of our victims/witnesses.

District Attorney Mark A. Peterson

   Mary Pickett and Jojo

Guest Commentary on the Death Penalty by DA Mark Peterson 

Contra Costa County District Attorney Mark A. Peterson responds to Contra Costa Times editorial regarding the death penalty. 

Click here to read more.

Fraud Alert - PSA

The District Attorney's Office of Contra Costa County, is warning residents to beware of a widespread telephone scam targeting taxpayers including seniors and immigrants.

Click here to view press release.

Click here to be redirect to the federal reporting system .

Real Estate Fraud PSA sponsored by Contra Costa County District Attorney's Office

This PSA seeks to proactively prevent rental fraud scam by informing the public to be wary of deals that are too good to be true.