You guys are wayyyyy ahead of us then. We have inspections by weights and measures once every 2 years. It used to be once a year but they're "overloaded". We have a yearly inspection by the fire department, but they are only looking for specific issues, and I don't believe flow rates are one of the things they look at.

Fuel levels in the ground are checked constantly and reconciled daily, but fluctuations in temperature have us over or short up to 60 gallons a day, so it's less accurate a representation of how calibrated the pumps are. California leaves it up to each station to stay on top of all the maintenance, but the fines for equipment not working right or tampered with are heavy to make the owners want to have accurate and properly working equipment.