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Triennial Secondary Containment Test

Triennial Secondary Containment Test is a task in the Underground Storage Tank Program


Underground storage tank systems are equipped with secondary containment spaces that catch leaks from the primary storage shell. The integrity of these secondary containment spaces must be tested every three years to verify that they are liquid tight. UST systems equipped with VPH are exempt from this requirement.

Tank and Piping Secondary Containment Testing

Tank and piping interstitial space is typically monitored by applying a vacuum to the space and verifying that the applied vacuum does not decay rapidly.

Sump Spaces and Under Dispenser Containment (UDC) Testing

Sumps and UDCs typically tested hydrostatically (with water). A passing test requires two sequential tests where liquid level does not drop more than a few 1/1000 of an inch.

Submit Triennial Secondary Containment Test Results

“The results of the secondary containment test–whether pass or fail–must be submitted to the local agency within 30 days of the completion of the test. [Cal. Code Regs., tit. 23, § 2637, subd. (a)(4).]” (California State Water Resource Control Board).


California State Water Resource Control Board: Underground Storage Tank (UST) Secondary Containment Testing


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