Santa Rosa storm drain manufacturer KriStar Enterprises Inc. has been sold to an international construction materials conglomerate that intends to expand its operations in Sonoma County.

Oldcastle Precast Inc. of Littleton, Colo., acquired the 20-year-old Santa Rosa company, which makes products to filter and manage stormwater. Financial terms were not disclosed.

KriStar founder Doug Allard said all 80 employees at production facilities in Santa Rosa, Windsor and Petaluma would stay on through the transition. The new owner will keep the KriStar brand and open new markets for KriStar's products, he said.

"We're pleased that they're going to continue to promote the KriStar brand," Allard said. "This gives us more of a national presence. Our intention is to focus on what we are good at."

Allard will remain general manager of KriStar.

Oldcastle Precast Inc. is a subsidiary of Oldcastle Inc., an Atlanta-based company with 37,000 employees in 50 states and Canada.

Oldcastle Inc. is the U.S. arm of CRH, a building materials company based in Ireland with 80,000 employees in 28 countries. CRH is traded on the New York Stock Exchange and the London Stock Exchange and had $25 billion in revenue in 2012.

Oldcastle Precast will offer the full KriStar line of stormwater management products, including the FloGard Dual Vortex, FloGard PerkFilter and BioMod brands, said Dave Steevens, president of Oldcastle Precast.

"The addition of these well-known brands and proven technologies, combined with our commitment to leadership in stormwater management, will allow owners and engineers a single source for design and selection of the optimal stormwater solutions for their projects," he said in a statement.

Allard said Oldcastle approached him about buying the company three or four months ago. He said being part of a larger company will allow KriStar to expand, and he predicted the move would create 20 new jobs in the near future.

"We did something right to get their attention," he said. "I'm extremely pleased that I'm bringing everyone with me. It's more jobs, increased production capabilities. We're very excited about it."

Founded in 1993 by Allard's former wife, Debra Ford -#8211; the company is named for two of their daughters, Krista and Tara. KriStar has grown by developing filters that screen sediment, chemicals and other pollutants out of storm drains. The company was able to grow during the recession by making products that satisfy the requirements of increasingly strict water quality regulations.

The purchase includes three manufacturing locations in Sonoma County, the company's intellectual property and its maintenance division, Drainage Protection Systems.