Weights and measures overview

The City of Seattle helps ensure that you are charged correctly for the products you buy. This includes making sure the price charged matches the one displayed, or that the weight listed on a package matches what's inside.

To enforce commerce requirements, the City inspects:

  • scales used by consumers
  • gas pumps
  • other commercial weighing and measuring devices

We also verify and test:

  • package-label accuracy for goods sold by weight
  • price scanners, such as those in grocery stores
  • trucks delivering home-heating oil
  • commercial vehicle scales

If you need to file a complaint about any of these, see complaints about weighing and measuring devices.

Businesses using weighing and measuring equipment

Contact the Seattle Consumer Affairs Unit if you have questions about regulation requirements and types of devices approved for commercial use.

Our inspectors can answer your questions as well as help you locate laws, regulations and reference publications. They can also provide details and statistics about Seattle testing and inspection programs.

City Weighmaster license for vehicle scales

Commercial vehicle scale operators in Seattle must have a City Weighmaster license. Contact us if you need a license.

Read the code

You can read the Seattle Municipal Code for legal details about consumer protection:

SMC Chapter 7.04 Weights and Measures

SMC Chapter 7.12 Disclosure of Unit Prices