As of October 1, 2018, all overfill prevention equipment used to comply with California Code of Regulations must be inspected periodically and after repairs. Inspections may occur at least once every 36 calendar months after the first inspection is completed. In addition to the periodic inspections, an inspection is required within 30 days of the date of the completion of a repair to the overfill prevention equipment to ensure that it is in proper functioning order.

Repairs are required any time the overfill prevention equipment ceases to operate properly and causes the UST to be out of compliance with UST requirements.
Before performing the inspection, the UST owners or operators must notify their UPA at least 48 hours before conducting the inspection. The notification provides an opportunity to the UPA to incorporate the inspection into their schedule so that they can witness the inspection. However, the UPA is not required to be present for the inspection to occur.

Manufacturer guidelines must be used if the guidelines meet the inspection criteria as defined below. If manufacturer guidelines do not exist or the manufacturer guidelines do not meet the inspection criteria, you must use an industry code or engineering standard, such as Petroleum Equipment Institute’s Recommended Practices 1200. If there are no manufacturer guidelines, industry codes, or engineering standards, or they do not meet the inspection criteria, then you must use a method developed by a California registered professional engineer.
The inspection procedure used will determine inspection activities such as removing the drop tube from the tank or flow restrictors from the vent piping.

At a minimum, the inspection criteria for overfill prevention equipment must determine: 1) if the equipment is set at the correct level in the tank; and 2) if the equipment will activate when the substance stored reaches that level. A assing result is when the overfill prevention equipment inspected is set at the correct level, and the equipment is in a condition that it will activate when the stored substance reaches that level. If the overfill prevention equipment fails the inspection, the UST service technician must explain why the equipment failed.