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

Bay Area Unity Ride 

District Attorney Mark Peterson invites you to participate in the first annual Bay Area Unity Ride April 23, 2016.

For more information, click on the links below or contact John Garcia (Vallejo Police Dartment) at 707-333-6196 or Jerry Sanchez (Solano County District Attorney's Office) at 707-724-3194.

Click here to view flyer.
Click here to view direction.
Click here to register.
Human Trafficking Awareness Events

2016 is kicking off with Human Trafficking Awareness Month. Click on the link below to view some of the events that will be taking place throughout January in Contra Costa County. These presentations, trainings, and discussions are aimed at increasing awareness while continuing to improve the response to sex and labor trafficking in our community. 

Human Trafficking Events

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.