Measure A (PDF) was passed by Napa County voters in March 1998, creating a Napa Flood Protection and Watershed Improvement Expenditure Plan, the Financial Oversight Committee and the Technical Advisory Panel, and establishing the half-cent sales tax to fund the local share of projects in Napa County.
Each incorporated City or Town receives a share of Measure A revenue, and a share goes to Napa County for use in the unincorporated area as well. Measure A includes specific approved projects and allows the funding of other projects to improve flood protection, water supply and the health of the watershed. All the Napa County governments involved in Measure A also signed a Joint Powers Agreement to spell out structure and responsibilities.