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Aliso Canyon (Porter Ranch) Natural Gas Leak


Aliso Canyon is approximately 6 miles from the City of Simi Valley and is within the jurisdiction of the South Coast Air Quality Management District. In response to questions from Ventura County residents regarding the natural gas leak, we are providing the following information.

On October 23, 2015, SoCalGas discovered that a well used to inject and withdraw natural gas from the underground storage reservoir at their Aliso Canyon facility (known as Well SS-25) was leaking. Initially, it was expected that the gas leak would last no longer than several days or weeks, at the most. However, despite several attempts by SoCalGas to stop the leak, natural gas is continuing to leak from the underground reservoir through Well SS-25 and its surroundings. The staff of the South Coast Air Quality Management District (SCAQMD) has participated in daily calls with SoCalGas and other government agencies to coordinate a response to the leak. Daily calls between SCAQMD, SoCalGas, and other responsible agencies have been occurring since mid-November.

The air monitoring conducted to date by SCAQMD allow for preliminary estimates of the potential air toxic risks associated with the air pollutants emitted by the Aliso Canyon gas leak. The current levels of community exposure from the leaking gas are not expected to cause a significant increase in overall risk of health effects from either short-term or long-term exposure to air toxic pollutants typically found in outdoor air in Southern California. However, exposure to the odorizing additives to natural gas such as tetrahydrothiophene and mercaptans can cause short-term symptoms, consistent with many of the symptoms reported by some community members. There are insufficient studies available to ascertain the long-term effects of exposure to these odorizing additives.

For more information, click on this weblink to access the SCAQMD Aliso Canyon incident webpage.

Location of Aliso Canyon relative to Ventura County


Carl Moyer Incentive Program Awards $33 Million to Ventura County Businesses



The Carl Moyer Memorial Air Quality Standards Attainment Program (Carl Moyer Program) is an incentive program offered jointly by the California Air Resources Board and California’s local air districts. The program provides grants for cleaner-than-required engines and equipment to help improve air quality in California. The grants are administered by the local air districts. The program is named after the late Dr. Carl Moyer in recognition of his work in the air quality field and his efforts in bringing about this incentive program.


Since 1999 the program has awarded over $33 million to Ventura County Businesses. On October 13, 2015, the Ventura County Air Pollution Control Board approved 38 new Carl Moyer Program grants totaling $2,778,060. The grants help owners of heavy-duty diesel equipment upgrade to new lower-polluting equipment. 2015 was the 17th year the District administered this program. Information on the grants awarded to Ventura County businesses can found here:


Board Letter 10/13/15

Board Letter 10/13/15 Attachment


The District will begin accepting Year 18 grant applications in April 2016. Approximately $3.5 million will be available to fund projects in Ventura County. Eligible projects will include the following:


• Repower model year 2004 and newer agricultural irrigation and water well pumps with electric motors or Final Tier 4 diesel engines. Pumps with model year 2003 and older engines are no longer eligible for grant funding.

• Repower commercial fishing boats with new lower emission engines.

• Replace farm tractors and construction equipment with new lower emission equipment.

• Repower farm tractors, construction equipment, and locomotives with new lower emission engines.


For information, the grant application forms that were used in 2015 are posted below. New application forms will be posted for the 2016 program. Please call or email Chris Frank, Air Quality Engineer, at (805) 645-1409 for additional information. Information is also available at these links:


Application Statement

Disclosure Statement

Compliance Statement

IRS Form W-9

Farm Tractor Replacement Application

Agricultural Pump Electrification Application

Agricultural Pump Diesel Repower Application

Marine Vessel Repower Application

Non-Farm Equipment Replacement Application

Off Road Equipment Repower Application

Locomotive Repower Application

Example of a Grant Contract


Recent Revisions to APCD Rule 74.15.1 Boilers, Steam Generators, and Process Heaters


APCD issues a Compliance Assistance Advisory regarding the June 23, 2015 revisions to APCD Rule 74.15.1 Boilers, Steam Generators and Process Heaters. The revised rule includes a number of changes, including new emission limits and testing requirements for a number of applicable units. The Advisory address a number of those changes.

To view the advisory, please click here.

Air Streams



Check out the latest Air Streams video for 2015! See what local businesses, individuals and agencies are doing to clean the air and help the environment. From a Thousand Oaks wastewater treatment plant to an Oxnard electric vehicle charging station; from a solar rooftop in Ventura to an Ojai oil field; from a LEED certified building to a “green” veterinary hospital, find out what’s happening on the clean air front in Ventura County.


California Air Pollution Control Officers Association (CAPCOA) - Explanation & Examples of Uses of PERP


Questions are often raised about what constitutes portable versus stationary operation of equipment. The PERP regulation defines portable operation and stationary sources. There are some specific circumstances where, depending on each situation, the use of PERP-registered units may not be compatible with the objectives of PERP and the District. These determinations are very fact dependent, so we recommend you contact the District with questions about whether your portable equipment operation requires a District permit or can use PERP registration.


The California Air Pollution Control Officers Association (CAPCOA) has prepared a document which addresses these issues: Explanation & Examples of Uses of PERP


Replacing Tier 1 & Tier 2 Ag Engines: Check Before You Buy!


APCD issues a Compliance Assistance Advisory regarding the California Air Resources Board’s Air Toxic Control Measure for Stationary Compression Ignition Engines (ATCM) requirement to replace Tier 1 and Tier 2 diesel Ag engines.

The ATCM prohibits the operation of Tier 1 and Tier 2 agricultural engines after December 31, 2014 for engines rated at 175 BHP or greater and December 31, 2015 for engines rated at 50 to 174 BHP.

Check before you buy! This advisory informs owners or operators of Tier 1 & Tier 2 Ag engines that not all Tier 4 or Interim Tier 4 diesel engines will meet the upcoming ATCM emission standards, and advises them to check before they buy a new engine. The upcoming emission standards are contained in the advisory. Another option is to buy an electric motor instead of a diesel engine.

There will be a limited amount of funding available to qualified applicants to help purchase a new diesel engine, or electric motor.

All Ag engines 50 horsepower and greater, including new replacement engines, are required to be registered with the APCD. For information on the District’s agricultural engine registration program please click here.

For the District's "Engine Location Change Policy Memo" and notification form, click here.


Portable Diesel Engine Fleet Reporting and Emission Requirements – Upcoming Enforcement Action


APCD Issues a Compliance Assistance Advisory directed at owners and operators of portable diesel engines who have not yet complied with the state’s Airborne Toxic Control Measure (ATCM) for Diesel Particulate Matter from Portable Engines reporting requirements, or who have fleets that do not meet the fleet emission requirements. These requirements apply to all portable diesel engines whether they are registered with the Statewide Portable Engine Registration Program (PERP), or operating under an APCD Permit to Operate.


New State Greenhouse Gas Regulations


The California Air Resources Board (ARB) is working on reducing greenhouse gas (GHG) emissions from multiple sectors of California’s economy, as part of the implementation of AB 32, the Global Warming Solutions Act. Several of ARB’s regulations take effect in 2011 and will affect businesses in Ventura County. ARB’s regulations effective this year will apply to operators of larger industrial and commercial refrigeration systems and semiconductor manufacturers. To assist those affected by ARB’s regulations, the APCD has prepared several Compliance Assistance Advisories. Read more...


Air – the search for one clean breath


To view film, click here.


EV Readiness Plan & Charging Station Grants


On January 23, 2014, Ventura County APCD and Plug in Central Coast hosted a public workshop to discuss the recently released EV Readiness Plan and EV Charging Station Maps. This Plan was developed under the California Energy Commission Grant No. ARV-11-002. In addition, this workshop provided information on current grant opportunities to install publicly accessible EV charging stations in the county. The notice for this workshop may be found here.


New Advisory for Large Water Heaters and Small Boilers


APCD issues a Compliance Assistance Advisory regarding the January 1, 2014 compliance date for manufacturers, suppliers and installers of large water heaters and small boilers. On September 11, 2012, the Ventura County Air Pollution Control Board amended Rule 74.11.1, Large Water Heaters and Small Boilers. The amended Rule includes a reduction to emission limits from natural gas-fired large water heaters and small boilers. Only those units that meet the new emission limits may be sold, offered for sale or installed in Ventura County.

Manufacturers of water heaters, boilers, steam generators and process heaters are required to have them certified by the Ventura County APCD before they may be sold in Ventura County.

Only those units meeting the emission limits specified in the rule can be sold, offered for sale or installed in Ventura County. Persons selling, offering for sale or installing non-compliant units may be subject to enforcement action by the Ventura County APCD and possible civil penalties.

To view the advisory, please click here.