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Over the past five years, Sonoma County has nearly cut in half the amount of open space that could be paved over by future development, according to a new report from a Bay Area environmental group.

A combination of voter-approved growth boundaries, greenbelts separating cities and taxpayer-funded land conservation means Sonoma County fares much better than other Bay Area counties in protecting its open space, the San Francisco-based Greenbelt Alliance found in its report, released Tuesday.

Overall, the span of open land considered to be at risk of future development in the county has dropped from 115,000 acres in 2012 to 58,400 acres — an area more than twice the size of Santa Rosa. The number of acres most at risk — meaning they could be paved over in the next decade — dropped 70 percent in that period, to 4,100 acres, the group found.

“Clearly, Sonoma County has been a leader on protecting open space,” said Teri Shore, the Greenbelt Alliance’s North Bay regional director.

The report called out the 900-acre Sonoma Developmental Center campus in Sonoma Valley as one of the properties at risk of being developed. The state is set to close the facility at the end of 2018 and a coalition of interest groups have united in an effort to protect the center’s open space.

The group credited the county with the “largest recent strides in land protection” in the Bay Area, where 293,100 acres of natural space and farmland is at risk of being developed over the next 30 years, according to the report.

That amount is nearly 10 times the size of San Francisco, though it marks a 9.2 percent decline of at-risk acreage since the Greenbelt Alliance’s 2012 analysis.

Among the region’s nine counties, Contra Costa had both the largest total acreage at risk and the largest amount of land at high risk for development over the next decade.

Sonoma County had the second highest tally for threatened open space, a factor mainly of the county’s vast size, at more than 1 million acres, its rural landscape and growing economy.

The report lauded the county’s recent actions to protect its greenbelts, including the overwhelming passage of Measure K, which extends for another 20 years protections on tens of thousands of acres of largely undeveloped lands separating cities in the county. The Greenbelt Alliance spearheaded the campaign for the measure.

“The strength with which Measure K passed … really indicates the value that our communities place on open landscapes,” said Dave Koehler, the executive director of Sonoma Land Trust, which has protected more than 48,000 acres in the county.

The report also called out the 2013 purchase of the 20,000-acre property formerly known as Preservation Ranch. It was the largest conservation deal in county history, protecting a sprawling landscape of forest and wildland in the northwestern corner of the county near Annapolis.

Along the more developed Highway 101 corridor, the report marked several areas at highest risk for development, including lands around Rohnert Park, Windsor, Healdsburg and Cloverdale.

Shore pointed to Rohnert Park’s University District project, under construction near Sonoma State University on the city’s eastern edge, as an example of the development that could chip away at open space around city limits.

Shore acknowledged that the property falls within the city’s urban growth land and the development was planned for years.

The Greenbelt Alliance “isn’t saying we shouldn’t build there, but in these other areas, we might want to take a look at how the building is done and to maybe prioritize growth first in the downtown area,” she said.

But Rohnert Park Mayor Jake Mackenzie pushed back on the report’s reference to his city. Areas identified by the report as “at risk” have been planned for growth for many years and the city has, in fact, encouraged downtown development by the SMART train station, he said.

Mackenzie, who sits on the board of the Greenbelt Alliance, said he was not consulted on the report’s language referencing Rohnert Park.

“To categorize these lands as ‘at risk,’ to me, it’s not accurate, because they’re not lands around Rohnert Park, as the report says. They are lands within Rohnert Park, within our urban growth boundary identified in our general plan,” Mackenzie said. “I reject the characterization in the report.”

Among the other threats to Sonoma County’s open space is the subdivision of undeveloped landscapes into small lots, the report said.

The Bay Area’s booming economy presents a major challenge for the region as it tries to balance the need for housing development and open space protection. The report called on counties not to use their greenbelts to satisfy housing demands.

Sonoma County’s urgent need for more housing doesn’t mean development has to encroach on the area’s open lands, said Bill Keene, general manager of the county’s Agricultural Preservation and Open Space District.

“There’s a lot of infill area within the cities where you can do that,” Keene said. “We have train stations all along Sonoma County where there’s a train that’s going to be running. Develop along those stations.”

To conduct its analysis, Greenbelt Alliance reviewed city and county general plans and zoning, local ordinances, government websites and news reports.

The group also relied on conversations with advocates and the local knowledge of its staff members, among other methods.

Editor’s Note: This story has been updated to reflect that the Greenbelt Alliance is a Bay Area environmental group, not a national environmental group.

You can reach Staff Writer J.D. Morris at 707-521-5337 or jd.morris@pressdemocrat.com. On Twitter @thejdmorris.