Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Regulatory Principles

Non-binding good regulatory principles endorsed by WWTG members covering many topics including testing, standards, analytical methods, measurement uncertainty, limits of detection, expiration date labeling, and the presence of naturally occurring substances.