CUPA Underground Storage Tank

The purpose of the underground storage tank inspection program is to ensure that hazardous materials stored in underground tanks are not released into the environment, potentially polluting ground and surface waters.Underground Storage Tank

The Orange County Health Care Agency (OCHCA), Environmental Health Division oversees the underground storage tank inspection program in most of the cities of Orange County, with the exception of Anaheim, Fullerton, and Orange. As the Certified Unified Program Agency (CUPA), Environmental Health is tasked by the Secretary for Environmental Protection to implement and enforce the underground storage tank codes. To this end, specialists from Environmental Health inspect underground storage tanks, monitoring equipment and compliance documents of UST systems to ensure that these systems are in compliance with the applicable laws and regulations.

This Agency also serves to educate and assist tank owners and operators with regulatory requirements. If you have questions that are not addressed on this page or would like clarification on a compliance issue, please click here to contact your district inspector directly.

CERS Business portal

News and Due Dates

Attention Secondary Containment Testers:

The secondary containment procedure that was described in the 2002 document “Standard for Secondary Containment Testing of Underground Storage Tank Systems” and accepted by OCHCA has been rescinded by the CalCUPA Forum.  The procedure is no longer valid. 

In accordance with 23CCR section 2637 testers must follow manufacturer’s guidelines or industry standards, such as the PEI 1200 manual. 

The OCHCA will no longer accept test results that utilize the rescinded procedure for sites that provided notification after 11/3/17.  Sites that notified for secondary containment testing prior to 11/3/17 may still submit results with the rescinded procedure. 

If there are questions regarding this change, please contact Susan Berg at

View this video for a simplified look at the UST "plan check" process.

Underground Storage Tanks—The Basics

A resource for small and medium-sized businesses in Orange County

This manual is intended to provide businesses with the tools necessary to own and operate an underground storage tank system in compliance with the rules and regulations enforced by OCHCA.

Underground Storage Tank System Testing Intervals

UST System Testing

Required Testing Interval


Every 3 Years

After Modifications

If Applicable

Monitor System Certification



Leak Detector



Spill Bucket



Secondary Containment1



Tank Integrity


Pipeline Integrity


1Not required on VPH systems.
2Only required for single-walled tanks. Interval depends on monitoring plan.
3For single-walled piping or systems not programmed for positive shutdown and fail safe.

Underground Storage Tank FAQs