Agricultural Commissioner


Agricultural Commissioner Sealer of Weights and Measures

Ag Commissioner Greg Clark

Agricultural Commissioner / Sealer of Weights and Measures

The Napa County Agricultural Commissioner and staff are responsible for the implementation of federal, State and local regulatory programs within Napa County. These programs are designed to protect people and the environment and to promote agriculture within the county. Napa County currently has a reputation as a premier wine-producing region, but, as history has shown, also has the climate and soils capable of producing many types of exceptional agricultural products.



Food Quality and Marketing

Direct Marketing, Farmers' Markets, Organic Registration, Standardization

Pesticide Safety Program

CalAgPermits, Continuing Education Resources, Pesticide Container Recycling, Pesticide Use Enforcement   

Pests and Diseases

European Grapevine Moth, Vine Mealybug, Glassy-winged Sharpshooter, Light Brown Apple Moth, Brown Marmarated Stink Bug

Weights and Measures

Device Registration Ordinance, Quality Control of Packaged Goods, Weighing and Measuring Devices

Wildlife Services

Introduction to the Program, Tips to Prevent Wild Animal Encounters


Other Department Information

2015 Ag Newsletter

Ag Commissioner/Sealer News

The 2015 Ag Newsletter is here!

Ag Newsletters


Buy Plants Locally!

Buy plants in Napa County where they are inspected for Glassy-winged sharpshooter egg masses. Your help has kept this important vector of Pierce’s disease out of the County for over 15 years. The health of the Napa County vineyards and economy depends on this effort!

Don't Bug Out PSA
Buy Local Plants PSA

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AG Respect

AG RESPECT invites everyone traveling in Napa Valley—whether on our roads or on our growing network of recreational and commuter trails—to learn more about our unique agricultural traditions and how important it is for each of us to do our part to protect our farming heritage.

Learn more about Ag Respect and its partners
Learn more about the Ag Preserve in Napa County
Learn how AG Respect took root in Napa