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10.2. Tightness Test


To determine whether a storage tank and/or its piping system are leaking. DEC requires using a test that can detect a tank or piping leak of 0.1 gallons per hour (gph) (with a probability of at least 95% and no more than 5% probability of false alarm. 

10.2.1. Scheduling

Subpart 2 UST Suction inspection are every three (3) years, while Subpart 3 UST Systems are inspected Annually.  

Compliance Monitored By  

Subpart 2: USTs regulated by DEC and EPA  

Subpart 3: USTs regulated by DEC only 

10.2.2. Inspection

The test(s) used must detect leaks from the entire tank system component. Tank tests must include the liquid-filled portion of the tank AND the vapor space above the petroleum, while piping tests must include all portions of underground piping (that routinely contain petroleum).  

A failed tightness test indicates a suspected leak, which must be reported to the State Spill Hotline within two (2) hours by the tank owner or the tank operator. 

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1. Backflow Preventer
2. Boiler
3. Building
5. Elevator
6. Escalator
7. Facade
  • 7.1. FISP
    • 7.1.1. Scheduling
    • 7.1.2. Inspection
    • 7.1.3. Filing
8. Fire Alarm
9. Fire Extinguisher
10. Fuel Tank
11. Generator
12. Gravity Tank
13. Pool
14. Smoke Detector
15. Sprinkler System
16. Standpipe System
17. Hood Suppression