Wisconsin Scale Certification & Weights and Measures

Wisconsin uses a combined model: state inspectors cover much of the state, while some cities and villages run their own weights and measures programs. If you operate a commercial scale in Wisconsin — at a warehouse, farm, recycling yard, retail store, or truck stop — here is who regulates it, what the law requires, and exactly who to contact.

Who inspects commercial scales in Wisconsin?

Hybrid: DATCP Bureau of Weights and Measures inspectors monitor scales, gas pumps, scanners and package weights statewide, but some municipalities (cities/villages, e.g., the City of Milwaukee) run their own weights and measures programs whose inspectors enforce the same standards; DATCP also serves contract cities and villages. Scale owners contact DATCP licensing in Madison (or their city program where one exists).

What Wisconsin requires of scale owners

Commercial vehicle scale operators need a current annual DATCP license for each scale ($115/scale, license year April 1-March 31) and an installation permit for new scales, and must have a DATCP-licensed weights and measures service company test each scale at least annually (within 12 months of the previous test), with test reports sent to DATCP within 30 days; $200 surcharges apply for overdue tests or late reports. Businesses that install, service, test or calibrate devices must be DATCP-licensed and use DATCP-certified technicians.

Getting a scale into service — 4 steps

1. Buy a legal-for-trade (NTEP-certified) scale appropriate for your application and capacity.
2. Confirm your jurisdiction — call the state program at (608) 224-4942 to learn whether a state inspector or your city or village program covers your location.
3. Arrange compliant installation and calibration. Where required, placing-in-service must be done by a licensed or registered service company.
4. Stay compliant. Pass required inspections, keep calibration current, retain service records.

Common questions