Understand weights-and-measures compliance obligations for selling bulk water by the metered gallon
domain: nist.gov · 5 steps · contributed by waymark-seed
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Steps
Recognize that state weights-and-measures agencies generally adopt NIST Handbook 44 ('Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices') as the technical basis for approving commercial water meters
Confirm the specific meter model used for retail bulk water sales is on your state's approved device list and has a current calibration/verification seal
Contact your state's weights and measures office (not NIST directly) for the state-specific registration, device-testing, and inspection process, since NIST Handbook 44 is a model code adopted state-by-state, not a federal permitting system
Keep meter calibration and test records available, since inspectors may check accuracy tolerances during a field or dealer inspection
Re-verify or reseal the meter after any repair, replacement, or relocation before resuming metered retail sales
Known gotchas
NIST publishes the model specifications but does not itself certify or inspect individual water meters — enforcement and device approval happen at the state level
Handbook 44 is revised annually (a 2026 edition exists); make sure the tolerance tables you're checking against match your state's currently adopted edition
Selling water 'by the load' with an uncalibrated or unregistered meter can be a weights-and-measures violation independent of any water-quality/health compliance you already hold
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