Phenomenon.

That's how you can describe San Antonio's recent craft beer boom, says Joey Villarreal.

Villarreal has been brewing beer at Blue Star Brewing for 22 years. He says he's never seen anything like the recent increase in breweries.

"It's just really gained steam within the last three to five years," he explained. "I know of two that have opened recently and one in planning down on Alamo."

There are currently 10 breweries in San Antonio, and a handful in surrounding areas. Several more are projected to open this year.

Villarreal thinks we can attribute the beer buzz to San Antonio's growing population.

"The city is growing," he said. "I think one of the reasons there is a big boom here is because there's so many people moving into town."

San Antonio's population has had a steady increase since 2010.

More people equals more craft beer. Could the answer to the beer boom really be so simple?

Dustin Blake, owner of Roadmap Brewing Company, thinks there's a little more to it.

"People are just trying to stay local more than everything else. Even people aren't going to the big pizza chains - they'd rather go to a local mom and pop shop. So I think craft beer fills that market, and particularly in San Antonio almost all our breweries are independently owned," he said.

That supportive community, coupled with a supportive industry, is what makes San Antonio's craft beer scene flourish, he thinks.

"You would never see a Walmart open across the street from a CVS, and then answer each other's questions," he said. "But if you're a brewery across the street and you have a question, everyone is very open."

And that's your recipe for the booming brewing.