(NVR) - Napa County’s policy of choosing 20 wineries at random each year to see if they are complying with county rules doesn’t go far enough for the grand jury.

Not when Napa County has about 350 wineries actively producing wine, raising the possibility that a winery could go a couple of decades without an audit. Not when winery compliance with county rules has become a hot-button issue in the community.

“The audits are limited in scope and all conditions specified by the use permits are not reviewed,” a new Napa County grand jury report stated. “This coupled with the relatively small number of wineries audited may not give a full picture of compliance.”

Napa County should audit each winery every five years or at intervals the county Planning Commission and Board of Supervisors deem appropriate, the grand jury recommended. In addition, the county should reveal the identities of wineries that fail to receive a clean audit.

Planning, Building and Environmental Services Director David Morrison said Tuesday that the county has yet to formulate its responses to these and other recommendations in the report.

The grand jury called its report “Are Napa County Wineries Following the Rules?”

Napa County’s annual winery audit looks at such issues as whether the selected wineries are complying with permitted wine production and visitation limits. It looks at whether wineries required to source 75 percent of their grapes from Napa County are doing so.

For the audits done for 2011 through 2013, 30 percent to 40 percent of the wineries each year failed to meet at least one use permit requirement, the grand jury report said.

The Board of Supervisors discussed code enforcement on March 3. It touched on the grand jury idea of identifying the winery audit scofflaws.

“How about we have a wall of shame?” Supervisor Mark Luce said at that meeting. “I think that’s what people really care about — their reputations.”