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.

Business Portal

Need help with your electronic HMBEP or UST submittal?

Orange County Environmental Health hosts an electronic report workshop.  Please visit for more information.

CERS Business portal

News and Due Dates

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