Unless compartments or tanks have been damaged or modified or the chassis modified or unless the marker seals have been broken, a compartment or tank shall be tested:

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The main idea being tested is that testing of a compartment or tank is required only when it is initially certified, unless there has been damage, modification, or a break in the marker seals. The initial test verifies the system’s integrity at the point of use, and if nothing has changed and the seals are intact, there’s no need for routine re-testing.

This is why testing only upon initial certification is the best answer. If the compartment or tank has been damaged, altered, the chassis modified, or the marker seals broken, re-testing would be necessary because those events indicate potential compromise to safety.

The other intervals—testing every year, every 5 years, or every 10 years—assume a need for periodic verification regardless of condition. That conflicts with the rule that testing is required only unless the specified changes or seal issues occur, so those options don’t fit the stated requirement.