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Leak Prevention Program

The Leak Prevention Program element includes requirements for tank installation, construction, testing, leak detection, spill containment, and overfill protection. Certified Unified Program Agencies (CUPAs) are the implementing agencies for the Leak Prevention program element. To find out which Unified Program Agency is responsible for your facility, see the Unified Program Regulator Directory.


Cleanup of leaking tanks often involves a soil and groundwater investigation and remediation, under the direction of a regulatory agency. Responsible parties (RPs) who believe cleanup at their site is complete and are denied case closure by the regulatory agency, may consider filing a closure petition.

UST Enforcement

The State Water Resources Control Board provides assistance to local agencies enforcing UST requirements.

UST Vapor Recovery

The California Air Resources Board’s (CARB) Vapor Recovery Program controls vapor emissions from gasoline marketing operations (gasoline dispensing facilities or service stations, tanker trucks (cargo tanks), bulk plants, and terminals), where gasoline vapor is a precursor to the formation of ozone and contains benzene, a constituent of gasoline vapor that has been identified as a toxic air contaminant. 

When do I need to replace my non-Unihose multi product dispensers?

If your non-Unihose dispensers were installed before April 1, 2003, they may remain in use for the remainder of their useful life unless major modifications are made to your facility. Major modifications include addition, replacement or removal of 50 percent or more of the buried vapor piping or replacing dispensers.

Non-Unihose dispenser was damaged/vandalized and needs to be replaced.

Dispensers damaged as a result of an customer accident or end user vandalism may be replaced with the previously installed type dispenser.

If I install a Unihose dispenser today, will it be allowed to stay in use beyond 2008?

Unihose and non-unihose dispensers that are eventually certified as part of EVR Phase II systems can be used beyond 2009.

What is an Above-ground Gasoline Storage Tank or AST?

An AST is a gasoline storage tank that is intended for fixed installations, without backfill, that is located above or below grade.  ASTs are commonly classified as either “single-wall” or “protected”.  Single-wall ASTs are constructed with a primary (single) wall typically made of steel.  Protected ASTs are constructed with a primary (inner) tank encased by a secondary (outer) tank, with a layer of insulating material (at least three inches thick) between the primary and secondary walls.  The insulating material is usually lightweight concrete or a similar material.

When is the standing loss control compliance date for new installations?

As of April 1, 2009, all new installations of ASTs are subject to standing loss control.  To determine applicability, please refer to the February 28, 2014 AST EVR Regulatory Advisory, and consult with your local district.  In order to meet standing loss control, new installations must choose one of the protected ASTs listed in ARB Executive Order VR-302, along with an ARB EVR-certified pressure vacuum vent valve (P/V valve).

Tank Tester Licensing

Tank integrity testing is required by law, must meet the requirements of the State Water Resources Control Board, and must be conducted by State licensed tank testers.

Client Testimonials

“Doug, thank you for sending Tim last night. Everything is settled now. Hope it is no more problem. Tim is a great, respectful technician (all your staff is great). They all voiced that you are a good boss and they follow a good company. Keep up the good work.” – Moe, San Jose, CA

“I am extremely happy and grateful with their installation of two Gilbarco dispensers and Passport POS system. Professional and knowledgable staff got the job done. They even came back and warrantied failed parts after six months, all without any hassles. I would highly recommend this company to any service station owner in need of repair, maintenance or upgrade.” – Nick, San Anselmo, CA