About Us

Eastern Contra Costa Transit Authority (Tri Delta Transit) provides nearly 3 million trips each year to a population of nearly 290,000 residents in the 225 square miles of Eastern Contra Costa County. Tri Delta Transit operates 15 local bus routes Monday-Friday, 5 local bus routes on weekends and holidays, door-to-door bus service for senior citizens and people with disabilities, and shuttle services for community events.


Public transportation is part of our transportation network and plays an important role in the county's economic health by:

  • Providing access to jobs and schools
  • Providing service to county clinics and local hospitals
  • Reducing congestion on local roads
  • Helping senior citizens and people with disabilities remain independent
  • Providing commuter services
  • Providing a school education program to teach young people to use the bus and transportation for field trips
  • Protecting the environment by reducing the number of vehicles on the road
  • Providing employment to over 150 residents of Contra Costa County


Demand for services is strong. Tri Delta Transit provides nearly 10,000 rides per day on fixed-route service and over 500 rides per day on paratransit (Dial-a-Ride).


  • 34 ECCTA employees
  • 174 contractor (First Transit provides contract services)


  • 62 fixed-route buses including 58 low floor Gillig buses, 2 Protera electric buses and 2 BYD electric buses.
  • 30 Paratransit buses and 6 med vans
  • over 650 bus stops
  • all fixed-route buses are equipped with bike racks
  • all buses are wheelchair accessible


Tri Delta Transit's FY 2014-2015 total operating budget is $21,282,000 and Capital budget is $13,600,000.

Operating Background

Eastern Contra Costa Transit Authority (ECCTA) was formed in 1977 as a Joint Powers Agency (JPA) consisting of the cities of Antioch, Brentwood, Pittsburg and the county of Contra Costa. Oakley incorporated as a city and joined in 1999. ECCTA is governed by an eleven-member board of directors composed of two appointed by each of the mayors of Antioch, Brentwood, Oakley, and Pittsburg, two appointed by the Contra Costa County Board of Supervisors, and one member at large. ECCTA operates fixed-route and paratransit service under the name "Tri Delta Transit" and contracts with a private company, First Transit, for the operation of the buses.


1977 To 1980


  • Tri Delta Transit was created to complement the BART express bus service. BART express buses began serving Eastern Contra Costa residents in 1975.
  • Fixed Route service was started on June 6, 1977 with local bus service in Pittsburg and Antioch.
  • The first Tri Delta Transit routes were the 380 and 381. These routes were designed to feed into BART express bus service that took residents to Concord BART.
  • AC Transit owned, operated and maintained all vehicles in Tri Delta Transit's fixed route service.
  • Fares were 25¢ for the general public and 10¢ for seniors and children.
  • Tri Delta Transit's first administrative office was located at: 6th Floor, Administration Building, 651 Pine Street, Martinez, CA 94553


  • Mr. Robert Armstrong was selected as Tri Delta Transit's first General Manager.
  • Tri Delta Transit's logo was introduced.
  • Tri Delta Transit contracted with the City of Antioch's department of public works to provide bus maintenance.
  • Tri Delta Transit administrative office moved to: 2400 Sycamore Drive, Antioch, CA 94509
  • The dispatch office and bus parking was located at: 1315 West 4th Street, Antioch, CA 94509


  • Paratransit service was added to serve seniors and disabled residents. This service was named Dial-a-Ride.
  • Tri Delta Transit contracted with Community Transit Services to operate paratransit services in East County.

1981 To 1990


  • Dial-a-Ride was expanded to serve all residents in rural East County.
  • The fixed route bus fare was increased to 50¢ for the general public and 25¢ for seniors, disabled residents and children age 5-12 year old.


  • Anne (Drew) Muzzini was selected to be Tri Delta Transit's second General Manager.


  • Tri Delta Transit moved maintenance operations to US Steel property in Pittsburg.


  • Tri Delta Transit ended its contract with AC Transit and consolidated fixed route and paratransit services under a contract with Community Transit Services.


  • Tri Delta Transit's Board of Directors formed a committee to oversee the purchase and building of a new facility that would consolidate administration, operations and maintenance onto one site.
  • Discounted fare rates for children 5-12 years old were discontinued.


  • Laidlaw Transit was selected to provide operation and maintenance services for Tri Delta Transit's fixed route and paratransit services.
  • Tri Delta Transit modified the three route bus system with service in Pittsburg and Antioch. This was a 20% increase in fixed route bus service.
  • The Antioch route was extended to improve service and service hours were increased by 16%.
  • Tri Delta Transit increased fixed route fare for the general public to 60¢.


  • Tri Delta Transit consolidated the operations, maintenance and administration offices into a single facility at: 801 Wilbur Avenue, Antioch, CA 94509
  • Tri Delta Transit added a computerized dispatch system for route information and Dial-a-Ride reservations at the new facility location.
  • Brentwood Dime-a-Ride service began as a subsidized route by the City of Brentwood. General passenger fares were 10¢.


  • Tri Delta Transit celebrated Dial-a-Ride's 10 year anniversary.


  • Under the Americans with Disabilities Act the Federal Government mandated that all transit agencies provide paratransit services to people with disabilities - Tri Delta Transit had already been operating paratransit services for 11 years.
  • Tri Delta Transit added three additional bus routes, increasing service by 29%.
  • Tri Delta Transit increased the fixed route fare for the general public to 75¢.

1991 To 2000


  • Dial-a-Ride service was changed to serve the transportation needs of our senior and disabled residents.
  • A new route serving southeast Antioch was implemented.
  • Dimes-a-Ride fare was increased to 20¢ for all passengers.


  • Tri Delta Transit's bus routes were reconfigured in response to information collected during a community survey and ridership analysis.
  • Additional service hours were added for Dial-a-Ride to ensure compliance with the Americans with Disabilities Act.


  • A second bus was added to the Brentwood Dimes-a-Ride bus service.
  • Bike racks were installed on all fixed route buses.
  • Jeanne Krieg was selected as the third General Manager of Tri Delta Transit.


  • BART celebrated the opening of the new Pittsburg/Bay Point BART station.
  • Tri Delta Transit increased frequency of service on routes 388 and 389.
  • Tri Delta Transit added a new express commuter route-390.


  • Tri Delta Transit took over operations of BART express bus service.


  • Tri Delta Transit added a seven day a week reservation system for the Dial-a-Ride service.
  • Tri Delta Transit added a new route to holiday and weekend service.
  • Tri Delta Transit began contracting with Contra Costa County to provide bus service between county medical facilities in Pittsburg and Martinez.


  • Tri Delta Transit added a community route service in Pittsburg.


  • Tri Delta Transit terminated its contracted maintenance services and brought these services in house.
  • Tri Delta Transit expanded service to additional county facilities in Antioch, Pittsburg, and Martinez.
  • Tri Delta Transit began Delta Express commuter bus service between East County and Livermore.

2001 To 2010


  • Tri Delta Transit began Sports service to the San Francisco 49ers home football games.


  • Tri Delta Transit celebrated its 25th anniversary.


  • Tri Delta Transit’s bus operator and maintenance team wins the Grand Champion title at the APTA International Bus Roadeo in Salt Lake City, Utah.


  • Tri Delta Transit celebrates completion of facility expansion project.


  • Tri Delta Transit launches three new local routes: 384, 385 & 386
  • Tri Delta Transit begins selling tickets online
  • Tri Delta Transit replaces all bus stop signs; includes route specific information serving each location


  • Tri Delta Transit becomes first transit agency in America to create designated area for passengers with strollers.
  • Tri Delta Transit adds a third local weekend route; route 394
  • Tri Delta Transit wins Creative Commercial Production Award fore its We Go Everywhere Television commercial.
  • Tri Delta Transit wins Best In Show at National Cable Advertising Awards for its We Go Everywhere Television commercial.


  • Fare increase to $1.25.
  • Tri Delta Transit celebrates its 30th anniversary
  • Tri Delta Transit launches Route 201 providing bus service to Concord BART


  • Tri Delta Transit introduces summer Youth Passes


  • Tri Delta Transit replaces eight buses with new, low-floor BRT-style buses
  • Local Route fares increase to $1.75
  • Express Route 300 fares increase to $2.25
  • The East Bay Value Pass is introduced allowing unlimited rides on fixed route buses on four East Bay transit services: Tri Delta Transit, County Connection, Westcat & Wheels


  • Tri Delta Transit joins Facebook and Twitter
  • Tri Delta Transit launches free email alert system providing customized alerts to subscribers

2011 To 2020



  • TDT installs new fare boxes on fixed route vehicles and introduces magnetic swipe tickets
  • TDT adds a fourth local weekend route: route 395
  • Local Route fares increase to $2.00
  • Express Route 300 fares increase to $2.50


  • Tri Delta Transit replaces 25 buses with new, low-floor BRT-style buses
  • Route 200 & 201 cash fares increase to $2.50
  • Dial-a-Ride fares increase to $2.75


  • Tri Delta Transit named Transit System of the Year by the American Public Transoportation Association. Category: operators providing 4 million rides or less per year.


  • Clipper Card accepted on Tri Delta Transit
  • 24-Hour Passes changed to single-Day Passes
  • Day Pass prices increase to $3.75 general public and $1.75 senior/disabled


  • Tri Delta Transit seeks public input for system redesign project to be implemented with the opening of the new Antioch BART Station.


  • 40th anniversary of service.
  • Tri Delta Transit launches Route 381 Downtown Pittsburg Circulator.


  • Tri Delta Transit launches Mobility on Demand service.
  • Tri Delta Transit changes routes to prepare for the opening of the Antioch BART station. Route 384 and 396 are added.
  • First battery electric buses are introduced into fleet.
  • Mobile Ticket app is created allowing customers to use mobile tickets on the bus.