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Gas Station Regulations

Every day, gas station activities generate five tons of gasoline vapors that contain toxic compounds that can be harmful to our health.


 Owners & Operators


Every day, gas station activities generate five tons of gasoline vapors that contain toxic compounds that can be harmful to our health. That’s why we partner with the owners and operators of the 1,200 + gas stations in King, Kitsap, Pierce and Snohomish counties to make sure they can run their business smoothly and safely.

Gasoline vapors can sting eyes, aggravate respiratory problems, such as asthma and emphysema, and cause cancer if inhaled over a long period. They are also major contributors to the formation of ozone (smog), which is strictly regulated by the Environmental Protection Agency (EPA).  


Stations that have a throughput over 200,000 gallons of gasoline per year or have existing Stage 1 or Stage 2 equipment, require owners and operators to:

  • Check nozzles and hoses for visible gasoline leaks on a regular basis. It is up to you to determine how often you should check for leaks so that you find them, not an inspector.
  • Keep a log of when you check for gas leaks, and keep it accessible for inspection. Here is an example of a log (PDF).
  • Immediately remove any defective equipment from service until repairs can be made.
  • Complete a pressure-decay test every six months. Stations with vapor-balance and vacuum-assist systems must complete a set of tests every year. Installations of new or replaced Stage 1 equipment now require specific tests.
  • Make sure testing is conducted on time. This is your responsibility, not the testing contractor.
  • Hire only certified technicians to do new installations, repairs, upgrades, and testing. All gas station technicians/contractors are required to complete the certification exam(s) to ensure customers are receiving consistent service quality. View our list of certified testers and installers.
  • Keep all test reports at the station for at least two years after the testing date, and keep them accessible for inspection.
  • Have an Operations and Maintenance (O&M) plan for your business and ensure employees understand their O&M responsibilities.
If you have questions, contact Kim Cole at or 206-689-4020.

 Certified Technicians


Installers and testers are required to be certified in order to conduct equipment tests and do installations and repairs. Certification is valid for two years and ensures all installers and testers are performing high-quality service so that every station is operating at optimum performance. The open-book exams for Vapor Recovery System Testing and Vapor Recovery System Installation repair are $75 each and are available online with the International Code Council at Exam reference books are available with local library systems.


Testers are required to file online test activity reports with 48 hours of a test.

Certified testers and installers can view a maintenance history of registered stations and submit test results through our online database.

Testing forms are also available for use:

  • Air-to-Liquid Ratio Test Procedures
    Alternative test methods acceptable to the Puget Sound Clean Air Agency that satisfy the requirements of CARB Test Procedure TP-201.5 for compliance with Regulation II, Section 2.07(f).

  • Air-to-Liquid Ratio Test
    CARB Test Procedure TP-201.5 certification results of the air to liquid dispensing ratio (by volume) for vacuum assist stage 2 systems.

  • Air-to-Liquid Ratio Test - VacuCheck Method
    Certification results when VacuTest testing equipment is employed to test the Air to Liquid Ratio of stage 2 vacuum assist systems.

  • Air-to-Liquid Ratio Test - VacuSmart Method
    Certification results when VacuSmart testing equipment employed to determine the Air to Liquid Ratio of stage 2 Vacuum assist systems.

  • Back Pressure Tests
    CARB Test Procedure TP-201.4 certification results of a dynamic performance test on stage 2 vapor piping, Compliance Testing Matrix. Lists the California Air Resources Board (CARB) executive orders and the required tests that should be conducted on stage 1 and 2 systems.

  • Compliance Testing Matrix

  • Compliance Test Failure Notice
    This notice clearly and simply clarifies what is expected of the owner/operator when their station fails a test. When you use this notice, please make a note of it in the Comment field of the online compliance testing activity report.

  • Drop Tube Overfill Protection Test
    CARB Test Procedure TP-201.1C certification results. The test checks the leak rate from the drop tube/drain valve assembly when the drain valve is configured to pass liquid into the drop tube.

  • Healy Return Line Tightness Test 
    CARB system certification results for the Healy Stage 2 Vapor Return Line Vacuum Integrity Test.

  • Pressure Decay Test
    CARB Test Procedure TP-201.3 (or Exhibit 3 test procedures) certification results from a static performance test of the tank and related stage 1 and 2 vapor recover equipment.

  • Static Torque of Rotatable Stage 1 Adaptors
    Torque setting for the riser and all brands of swivel adapters. Stage 1 EVR systems and Swivel Adapters are required to be torqued to specific setting required by the manufacturer.

  • Tie-Tank Test 
    CARB Test Procedure TP-201.3C certification results. The test determines all gasoline tanks are manifolded together and that diesel tanks are isolated from the system.

 Service Contractors


The service contractors listed below are not endorsed by the Clean Air Agency. This list is for informational purposes only and may not be current.

To be added or removed from this list, send an e-mail to:

GLS Maintenance & Repair, LLC.
Mill Creek, WA
Gordon Stocks
Evergreen Environmental Services , Inc.
Mill Creek, WA
Anita McMahan
Joe Hall Construction, Inc
Fife, WA
Robert Walker
253-922-6815 Ext 4
Mascott Equipment Co., Inc.
Seattle, WA
Sara Guenther
Northwest Environmental Solutions, Inc.
Sumner, WA
Kevin Wilkerson
Northwest Tank & Environmental Services, Inc. 
Snohomish, WA
Remy Cano
Pacific Environmental Services Company
Port Townsend, WA
John H. Tryon
Patriot Environmental
Tacoma, WA
Alex Hajihashemi
Rapid Service, Inc.
Tacoma, WA
Saybr Contractors, Inc.
Tacoma, WA
Eric Martin
SME Solutions LLC 
Lakewood, WA
Jeff Stephens
Tanknology Corporation
Lodi, CA
Mark Shaw

 Frequently Asked Questions


What is an Operation and Maintenance (O&M) plan?

Gas station owners are required to develop and maintain an Operation and Maintenance (O&M) plan. These can be as simple as a checklist showing when inspections for gasoline leaks from hoses and nozzles are completed and any corrective action (repair) taken. The O&M plan should include a simple statement of how the station will complete the required  tests in a timely manner. Some stations set a regular testing schedule (e.g., every December and June).

Does the Clean Air Agency inspect gas stations?

Yes. We may inspect your station, but we are less likely to do so if we have your passing tests on file and your registration fees are paid on time.

What tests are needed to comply with the rules?

  • All stations need to have a pressure-decay test every six months.
  • Stations with vapor-balance systems need to have a complete set of tests every year instead of every other year.
  • A tank torque test must be included in the complete set of annual tests.
  • The tank-tie test must be conducted at least once, or after any tank configuration changes to show the tanks are manifolded.
  • All new or complete replacement of Stage One or Stage Two equipment must file a completed notification form with the Agency (underline “notification form” and make a link to this form). Installations will need a specified set of tests prior to operation.

How much will the tests cost?

Costs may vary. Contact a certified technician for test costs.

Can I resume full operations at my station if any of the tests fail?

No. If the defective equipment cannot be repaired by the close of the next business day following the failed compliance test, you must stop receiving and/or dispensing gasoline from the defective equipment until it is repaired and retested, and passes all required compliance tests.

How long will I need to keep test reports?

The station owner or operator is required to keep copies of test reports on-site for two years from the dates of the tests.

Who is responsible for notifying the Clean Air Agency that the testing was completed?

The tester is required to submit a pass/fail test to the agency within five days after the test.

What is the agency's position on the new EPA guidance for removing Stage II vapor control systems?

The Puget Sound Clean Air Agency has reviewed the EPA guidance and conducted our own analysis. Here are the results


Why am I required to hire technicians who are certified?

Only technicians who have passed the certification exams are permitted to conduct equipment tests and do new equipment installations in our jurisdiction. Highly-skilled, certified technicians help ensure that testing and repairs are done correctly, saving station owners and operators staff time and training costs and reducing equipment failures.

Where can I find a list of certified technicians registered with the Clean Air Agency?

View list of certified testers and installers.

What happens if a testing technician is not certified as required by the Clean Air Agency?

A tester who claims to be certified but is not may be fined by the Clean Air Agency. Ultimately, you, the gas station owner/operator, are responsible for hiring a certified technician. Always ask a technician for his or her certification card to ensure it is valid.