Skip navigation Reduce Motion High Contrast Careers Contact Us
Skip to main content
  • OCTA Environmental Programs from A to Z

  • Awards

    In 2015, OCTA’s Measure M2 Environmental Cleanup Program was honored with a Sustainability Award by the Southern California Association of Governments (SCAG).

    Bus Emissions Inspections

    Opacity tests are performed on all number one inspections for diesel buses.  Opacity tests are performed annually for all contingency buses.  A bus is immediately removed from service if it fails its opacity test and repairs are scheduled.

    Clean Fuel

    Over 88% of our buses run on clean natural gas (LNG or CNG). As part of our fleet modernization program, future bus purchases will be for natural gas powered or outfitted with required clean technology.

    Diesel Use

    OCTA contingency fleet (approximately 49 buses) are still operated on diesel. 17 of our remaining diesel buses have been retrofitted with Level 3 Diesel Particulate filters that reduced diesel soot by more than 85 percent. The contingency fleet is deployed for long term emergencies in the event that we can’t fuel CNG or LNG. All diesel buses in our fleet use ultra low sulfur diesel that has been shown to improve air quality. 

    Engine replacement / repower

    The OCTA is in the process of replacing older CNG engines with 2014+ compliant Cummin ISL-G that will reduce NOX emissions by 90% and particulate emissions by 99%. 

    OCTA’s bus operators use only hybrid or natural gas powered vehicles like Toyota Prius or CNG Honda Civic in conducting bus operator relief operations.   

    Fleet Emissions

    OCTA is exceeding all of the current CARB and SCAMQD emissions requirements for an urban bus fleet as well as for transit fleet vehicles. Compared to 2002 baseline emissions, OCTA reduced it particulate matter emissions by 95%. Compared to 2002 baseline emissions, OCTA reduced its NOX emissions by almost 78%.

    Freon Recovery

    OCTA recycles refrigerants through the use of a reclaim machine. Over 95% of our buses use HFC-134a in their air conditioning systems. HFC-134a has been regarded by the EPA as one of the safest refrigerants around. 

    HVAC Energy Efficiency Study

    In 2013, OCTA completed a facility study for energy conservation at all bus maintenance buses. As a result, the study provided an equipment payback analysis for the HVAC and air compressor systems.  OCTA is actively pursuing cost and energy efficient replacements and upgrades to our aging systems.

    LED Upgrades

    As of May 2014, OCTA has replaced 64 high pressure sodium lights and replaced them with energy efficient LED lights at the Brea Park and Ride and Fullerton Park and Ride stations.  

    Parts Cleaning System

    The OCTA has replaced solvent parts cleaning system with aqueous cleaning units that have water based solutions. These solutions are nonflammable and contain little or no volatile organic compounds. As a result, the OCTA has eliminated significant hazardous waste generated from its parts cleaning systems. 

    Open Space

    As of January 2014, the OCTA has acquired approximately 1,150 acres of open space property that will be permanently designated as wilderness preserves as part of the Measure M2 Freeway Environmental Mitigation Program.  
    See more about Open Space here


    The OCTA has an active recycling program that diverts paper, metals, cardboard, plastic and aluminum cans from landfills.

    Spill Kits

    All maintenance road call service trucks are equipped with spill kits.  Spill kit supplies are stocked at all of the OCTA maintenance bus bases. These kits allow our employees to immediately clean up accidental spills of antifreeze or oil from our buses.

    Stormwater Management

    Stormwater is water from rain or snowfall that flows across the land and ultimately into rivers, creeks, lakes, and ditches. Other sources of water include over-irrigation, automobile wash water, or any other activity that results in water flowing into the storm drainage system. This water runoff carries debris, trash, sediment, pollutants, etc. from sidewalks, streets, and parking lots through storm drains and eventually into the rivers, creeks, and lakes. Fertilizers, paint, antifreeze, oil, fuel, and other materials may also be carried from urbanized areas to the waterways. These pollutants can add to or create problems in bodies of water.

    Stormwater goes directly from the storm drainage system into local lakes, rivers, and streams with no water quality treatment.

    The Santa Ana Regional Water Quality and Control Board regulates stormwater runoff for OCTA’s facilities and activities. To be in compliance with stormwater permits, OCTA implements robust Stormwater Pollution Prevention Plans (SWPPP). The SWPPP describes actions OCTA should take to ensure stormwater leaving our facilities have no pollutants.


    In an effort to save water, OCTA has switched to low-maintenance, low water usage xeriscaped landscaping at several facilities. The switch has helped OCTA facilities like the Fullerton Transportation Center reduce irrigation water consumption by 40%.

Get Connected