40 CFR §267.193
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
You must test all new tanks and ancillary equipment for tightness before you place them in use. If you find a tank system that is not tight, you must perform all repairs necessary to remedy the leak(s) in the system before you cover, enclose, or place the tank system into use.